{"title":"iOptron HEM Hybrid Strain Wave Mounts","description":"\u003cp\u003eiOptron HEM mounts are hybrid equatorial mounts that use strain wave gearing to deliver a high payload in a light, compact head. They are designed for portable astrophotography where carrying weight matters.\u003c\/p\u003e\u003cp\u003eThis collection includes the HEM27 and the larger HEM44, along with the HEM27\/HEM44 counterweight bar, which adds balance and stability when you mount heavier telescopes and imaging trains.\u003c\/p\u003e","products":[{"product_id":"ioptron-hem27-mount","title":"iOptron HEM27 Mount","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHybrid drive: StrainWave 17 RA gear (480:1) with backlash-free worm\/belt DEC\u003c\/li\u003e\n\u003cli\u003e29.74 lbs (13.5 kg) payload without counterweights, 44 lbs (20 kg) with optional counterweight\u003c\/li\u003e\n\u003cli\u003e8.15 lbs (3.7 kg) mount head for a 3.65 payload-to-weight ratio\u003c\/li\u003e\n\u003cli\u003eGo2Nova® 8409 controller with ~212,000 objects and built-in Wi-Fi\u003c\/li\u003e\n\u003cli\u003eHigh-precision RA encoder with Realtime PEC (EC versions)\u003c\/li\u003e\n\u003cli\u003eAvailable with internal iPolar electronic polar scope, or in a 0–22° latitude version\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eiOptron HEM27 Mount\u003c\/h2\u003e\n\u003cp\u003eThe iOptron HEM27 Mount uses a StrainWave 17 gear on its right ascension axis to carry a 29.74 lbs payload without a counterweight, all from a mount head that weighs just 8.15 lbs. That 3.65 payload-to-weight ratio makes it one of the most portable ways to carry a serious imaging rig, and the Go2Nova® 8409 hand controller, ~212,000-object database, 6º\/sec slew speed and built-in Wi-Fi make it ready for modern, computer-driven sessions. The HEM27 is offered in several versions: the standard HEM27, the HEM27EC with a high-precision RA encoder for Realtime PEC, each with or without the internal iPolar electronic polar scope, plus a HEM27 version configured for 0–22° latitudes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStrainWave 17 Hybrid Drive: 480:1 Reduction and Zero Backlash\u003c\/h3\u003e\n\u003cp\u003eEvery HEM27 pairs a high-torque StrainWave gear on the critical right ascension axis with a backlash-free worm\/belt system on the declination axis. The StrainWave gear eliminates the traditional RA worm, delivering zero backlash and smooth, consistent tracking with a 360-second native period, while its 480:1 reduction ratio gives the stepper motor precise control. Putting harmonic-drive technology where tracking matters most, and a lighter system on DEC, is what keeps the mount so compact without compromising performance for imaging, visual or solar observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3.65 Payload-to-Weight Ratio: 29.74 lbs Capacity in an 8.15 lbs Body\u003c\/h3\u003e\n\u003cp\u003eThe HEM27 head weighs only 8.15 lbs (3.7 kg) with its dual Vixen\/Losmandy saddle, yet carries up to 29.74 lbs (13.5 kg) of telescope and camera without a counterweight or shaft. That turns a full imaging setup into a true grab-and-go kit that is fast to deploy and light enough for travel. When your system grows, adding the optional counterweight shaft and 10 lbs counterweight raises the total payload capacity to 44 lbs (20 kg).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEC Versions: High-Precision RA Encoder with Realtime PEC\u003c\/h3\u003e\n\u003cp\u003eThe \"EC\" in HEM27EC stands for the high-precision encoder built into the RA drive. It provides constant, high-resolution feedback on the axis position, enabling Realtime Periodic Error Correction. Non-EC versions use traditional PEC, where the mount records its periodic error and plays the correction back; that works well, but it cannot account for non-repeating errors or instantaneous deviations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoother tracking:\u003c\/strong\u003e Realtime PEC corrects gear imperfections on the fly instead of replaying a recorded curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetter data:\u003c\/strong\u003e Tighter star shapes and longer sub-exposures, especially under high-resolution imaging conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLess guiding effort:\u003c\/strong\u003e Reduced workload on your autoguider and more room for unguided exposures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoose Your HEM27 Version\u003c\/h3\u003e\n\u003cp\u003eAll HEM27 versions share the same StrainWave 17 hybrid drive, 29.74 lbs counterweight-free payload, Go2Nova® 8409 controller and built-in Wi-Fi. They differ in tracking correction, polar alignment and latitude range. The HEM27 has no optical polar scope, so plan your polar alignment method when choosing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM27 Mount:\u003c\/strong\u003e The core hybrid mount with traditional recorded PEC. A great fit for autoguided imaging, visual and solar observing, or if you already have an electronic polar alignment solution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM27 Mount w\/ iPolar:\u003c\/strong\u003e Adds iOptron's internal iPolar electronic polar scope for fast, screen-based polar alignment with ~30 arcsec precision from a Windows PC. The most straightforward path to precise polar alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM27EC Mount:\u003c\/strong\u003e Adds the high-precision RA encoder for Realtime PEC, for imagers who want the best tracking accuracy and already have their own polar alignment method.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM27EC Mount w\/ iPolar:\u003c\/strong\u003e The complete package: RA encoder with Realtime PEC plus the internal iPolar, for demanding long-exposure and high-resolution astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM27 Mount Low-Latitude (0-22°):\u003c\/strong\u003e A version of the HEM27 configured for observing sites at 0–22° latitude. The other versions adjust from 15º to 65º, so choose this one if you observe from a site below 15° latitude.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eGo2Nova Control and Cable Management: 212,000 Objects, Wi-Fi and 2 x 12V Outputs\u003c\/h3\u003e\n\u003cp\u003eThe Go2Nova® 8409 hand controller gives you GoTo access to approximately 212,000 celestial objects at slew speeds up to 6º\/sec. Built-in Wi-Fi lets you command the mount from a smartphone, tablet or PC using iOptron Commander or ASCOM-compatible applications like N.I.N.A., TheSkyX or Sequence Generator Pro, with a USB port for wired control and an ST-4 compatible autoguide port. An integrated cable management system provides two 12V DC outputs (4A max) and a USB 2.0 port on the saddle plate to power cameras and dew heaters without snag-prone cables, and an electronic friction brake engages when power is cut to protect your equipment from unexpected movement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eiOptron HEM27 vs. GEM28: StrainWave vs. Traditional German Equatorial\u003c\/h3\u003e\n\u003cp\u003eThe HEM27 represents a different design philosophy compared to iOptron's traditional center-balanced equatorial mounts like the GEM28.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCounterweights:\u003c\/strong\u003e The GEM28 requires counterweights to balance any payload, adding weight and setup time. The HEM27 handles up to 29.74 lbs without any counterweights, making it faster to deploy and significantly lighter for travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBacklash and Periodic Error:\u003c\/strong\u003e The GEM28 uses a worm-and-wheel system, which inherently has some backlash and periodic error that may require autoguiding to correct. The HEM27's StrainWave gear is backlash-free by design, and the EC versions add Realtime PEC on top.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolar Alignment:\u003c\/strong\u003e The GEM28 often includes an integrated optical polar scope, while the HEM27 has none. That is why the HEM27 is offered with the internal iPolar electronic polar scope, the recommended choice for precise astrophotography alignment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the HEM27 versions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAll versions share the same StrainWave hybrid drive, \u003cstrong\u003e29.74 lbs (13.5 kg)\u003c\/strong\u003e counterweight-free payload and Go2Nova® 8409 controller. The \u003cstrong\u003eHEM27EC\u003c\/strong\u003e adds a high-precision RA encoder for \u003cstrong\u003eRealtime PEC\u003c\/strong\u003e, while the standard HEM27 uses traditional recorded PEC. Versions labelled \u003cstrong\u003ew\/ iPolar\u003c\/strong\u003e include the internal iPolar electronic polar scope. The \u003cstrong\u003eLow-Latitude\u003c\/strong\u003e version is configured for sites at \u003cstrong\u003e0–22°\u003c\/strong\u003e latitude, whereas the other versions adjust from \u003cstrong\u003e15º to 65º\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the iOptron HEM27 require counterweights?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot for most setups. The iOptron HEM27 carries up to \u003cstrong\u003e29.74 lbs (13.5 kg)\u003c\/strong\u003e without any counterweights. For a heavier instrument, adding the optional counterweight shaft and a 10 lbs counterweight increases the total capacity to \u003cstrong\u003e44 lbs (20 kg)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is a StrainWave gear system on the iOptron HEM27?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA StrainWave (or harmonic) gear uses a flexible, cup-shaped component to achieve a very high reduction ratio, \u003cstrong\u003e480:1\u003c\/strong\u003e on the HEM27's RA axis, in a compact space. Its main advantage for astronomy is the complete elimination of backlash, giving smoother and more accurate tracking than traditional worm gears. The DEC axis uses a backlash-free worm\/belt system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I polar align the iOptron HEM27 for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe HEM27 does not have an optical polar scope. The iPolar versions include iOptron's internal iPolar electronic polar scope, which connects to a \u003cstrong\u003e64-bit Windows\u003c\/strong\u003e PC via USB 2.0 and guides you to an alignment with \u003cstrong\u003e~30 arcsec\u003c\/strong\u003e precision. It can even plate-solve the star field near the pole when Polaris itself is blocked. With the other versions, use your own electronic polar alignment method.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HEM27EC's RA encoder improve astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe encoder enables \u003cstrong\u003eRealtime PEC\u003c\/strong\u003e: the mount continuously measures and corrects its own tracking errors instead of replaying a recorded error curve. For imagers, this means rounder stars, longer sub-exposures and less reliance on aggressive autoguiding corrections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I control the iOptron HEM27 mount with my computer or smartphone?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Every HEM27 version has \u003cstrong\u003ebuilt-in Wi-Fi\u003c\/strong\u003e, so you can control it wirelessly from a smartphone, tablet or computer using iOptron Commander or ASCOM-compatible applications like N.I.N.A., TheSkyX or Sequence Generator Pro. No external Wi-Fi dongle is required, and a USB port is available for a wired connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the iOptron HEM27 a good choice for imaging Jupiter with a Celestron C8 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. A typical Celestron C8 weighs around 13 lbs, well under the \u003cstrong\u003e29.74 lbs\u003c\/strong\u003e counterweight-free payload capacity. The backlash-free tracking and \u003cstrong\u003e6º\/sec\u003c\/strong\u003e slew speed make it easy to locate Jupiter and keep it centered for high-magnification planetary imaging, and the EC versions' Realtime PEC helps hold longer focal lengths steady.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Type\u003c\/td\u003e\n\u003ctd\u003eHybrid Equatorial Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRA Gear System\u003c\/td\u003e\n\u003ctd\u003eStrainWave 17\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDEC Gear System\u003c\/td\u003e\n\u003ctd\u003eBacklash-free worm\/belt system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRA Reduction Ratio\u003c\/td\u003e\n\u003ctd\u003e480:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload (No Counterweight)\u003c\/td\u003e\n\u003ctd\u003e29.74 lbs (13.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload (With Counterweight)\u003c\/td\u003e\n\u003ctd\u003e44 lbs (20 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Weight\u003c\/td\u003e\n\u003ctd\u003e7.49 lbs (3.4 kg) w\/o saddle, 8.15 lbs (3.7 kg) with saddle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload to Mount Weight Ratio\u003c\/td\u003e\n\u003ctd\u003e3.65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive Motor\u003c\/td\u003e\n\u003ctd\u003eStepper motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNative Period\u003c\/td\u003e\n\u003ctd\u003e360 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Precision Encoder\u003c\/td\u003e\n\u003ctd\u003eYes, RA axis (EC versions); none (non-EC versions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeriodic Error Correction (PEC)\u003c\/td\u003e\n\u003ctd\u003eRealtime PEC (EC versions); recorded PEC playback (non-EC versions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStructure Material\u003c\/td\u003e\n\u003ctd\u003eAll metal, CNC machined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExterior Finish\u003c\/td\u003e\n\u003ctd\u003eAnodized black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Saddle\u003c\/td\u003e\n\u003ctd\u003eVixen \u0026amp; Losmandy dual saddle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLatitude Adjustment Range\u003c\/td\u003e\n\u003ctd\u003e15º ~ 65º (all other versions); 0º ~ 22º (Low-Latitude version)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAzimuth Adjustment Range\u003c\/td\u003e\n\u003ctd\u003e± 5º\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl System\u003c\/td\u003e\n\u003ctd\u003eGoToNova® \/ Commander\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHand Controller\u003c\/td\u003e\n\u003ctd\u003eGo2Nova® 8409 with ~212,000 objects database\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Slew Speed\u003c\/td\u003e\n\u003ctd\u003e6º\/sec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Requirement\u003c\/td\u003e\n\u003ctd\u003eDC 12V, 5A (5.5mm\/2.5mm plug)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.5A (Tracking), 1A (GoTo)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Off Brake\u003c\/td\u003e\n\u003ctd\u003eElectronic friction brake\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBuilt-in Wi-Fi\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003eWi-Fi and USB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoguide Port\u003c\/td\u003e\n\u003ctd\u003eYes (ST-4 compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable Management\u003c\/td\u003e\n\u003ctd\u003e2 x 12V DC Out (4A max), 1 x USB 2.0 Port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Polar Scope\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectronic Polar Scope\u003c\/td\u003e\n\u003ctd\u003eInternal iPolar, ~30 arcsec precision (iPolar versions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLevel Indicator\u003c\/td\u003e\n\u003ctd\u003eLevel bubble\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirmware Upgradeable\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod\u003c\/td\u003e\n\u003ctd\u003eOptional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCounterweight \u0026amp; Shaft\u003c\/td\u003e\n\u003ctd\u003eOptional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-20ºC ~ 40ºC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHEM27 Mount Head\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (non-EC versions)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHEM27EC Mount Head with RA Encoder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (EC versions)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVixen \u0026amp; Losmandy Dual Dovetail Saddle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eGo2Nova® 8409 Hand Controller\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInternal iPolar Electronic Polar Scope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (iPolar versions)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.ioptron.com\/category-s\/133.htm\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/iOptron_iPolar_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload iPolar Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"HEM27 Mount","offer_id":44967997473053,"sku":"IOP-H272","price":2855.0,"currency_code":"CAD","in_stock":true},{"title":"HEM27 Mount w\/ iPolar","offer_id":44967997505821,"sku":"IOP-H272A","price":3079.0,"currency_code":"CAD","in_stock":true},{"title":"HEM27EC Mount","offer_id":52917264154909,"sku":"IOP-H274","price":4759.0,"currency_code":"CAD","in_stock":true},{"title":"HEM27EC Mount w\/ iPolar","offer_id":44967997538589,"sku":"IOP-H274A","price":4983.0,"currency_code":"CAD","in_stock":true},{"title":"HEM27 Mount Low-Latitude (0-22°)","offer_id":44995918561565,"sku":"IOP-H272AL","price":2797.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/iOptron-HEM27-Mount__56181.1652734596.1280.1280.jpg?v=1684347804"},{"product_id":"ioptron-hem44-mount","title":"iOptron HEM44 Mount","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e44 lbs (20 kg) payload without counterweights, 55 lbs (25 kg) with optional counterweight\u003c\/li\u003e\n\u003cli\u003e13.65 lbs (6.2 kg) mount head for a 3.23 payload-to-weight ratio\u003c\/li\u003e\n\u003cli\u003eHybrid drive: StrainWave RA gear (640:1) with backlash-free worm\/belt DEC\u003c\/li\u003e\n\u003cli\u003eGo2Nova® 8409 controller with ~212,000 objects and built-in Wi-Fi\u003c\/li\u003e\n\u003cli\u003eHigh-precision RA encoder with Realtime PEC (EC versions)\u003c\/li\u003e\n\u003cli\u003eAvailable with internal iPolar electronic polar scope (iPolar versions)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eiOptron HEM44 Mount\u003c\/h2\u003e\n\u003cp\u003eThe iOptron HEM44 Mount redefines portable astrophotography by delivering a 44 lbs (20 kg) instrument capacity in a mount head that weighs only 13.65 lbs (6.2 kg). This remarkable 3.23 payload-to-weight ratio comes from a hybrid drive that pairs a high-precision StrainWave gear on the right ascension axis with a backlash-free worm\/belt system on the declination axis. The Go2Nova® 8409 controller puts ~212,000 celestial objects at your fingertips, and built-in Wi-Fi enables full remote control of your imaging session. The HEM44 is offered in several versions: the standard HEM44 and the HEM44EC with a high-precision RA encoder for Realtime PEC, each available with or without the internal iPolar electronic polar scope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHybrid StrainWave Drive: A 44 lbs Payload on a 13.65 lbs Mount\u003c\/h3\u003e\n\u003cp\u003eThe core of every HEM44 is its hybrid drive. The RA axis uses a StrainWave gear with a 640:1 reduction ratio and a 270-second period, delivering the zero-backlash response and high torque that precise long-exposure tracking demands. The DEC axis uses a backlash-free worm\/belt system for smooth slewing and guiding corrections without the cost and weight of a second harmonic drive. For payloads up to 44 lbs, you can run the HEM44 completely counterweight-free, dramatically reducing what you carry into the field. For larger setups, the optional counterweight shaft and 10 lbs counterweight raise the capacity to 55 lbs (25 kg).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEC Versions: High-Precision RA Encoder and Realtime PEC\u003c\/h3\u003e\n\u003cp\u003eThe HEM44EC adds a high-precision encoder on the RA axis that constantly monitors the mount's position. This feedback loop enables Realtime PEC (Periodic Error Correction), which actively corrects the drive's minute mechanical variations as they happen, before they become visible in an image.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRounder stars:\u003c\/strong\u003e Smoother, more accurate raw tracking than the standard HEM44, crucial for high-resolution imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLess guiding effort:\u003c\/strong\u003e Reduced reliance on aggressive autoguiding corrections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnguided potential:\u003c\/strong\u003e High-quality unguided exposures become practical with a well-aligned mount and a short-to-medium focal length telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoose Your HEM44 Version\u003c\/h3\u003e\n\u003cp\u003eAll HEM44 versions share the same hybrid StrainWave drive, 44 lbs counterweight-free payload, 13.65 lbs head, Go2Nova® 8409 controller and built-in Wi-Fi. They differ in two ways: whether the RA axis has a high-precision encoder, and whether the internal iPolar electronic polar scope is included.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM44 Mount:\u003c\/strong\u003e The core hybrid mount. An excellent choice for visual observers and imagers who autoguide, or who already have an electronic polar alignment solution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM44 Mount w\/ iPolar:\u003c\/strong\u003e Adds iOptron's internal iPolar electronic polar scope for fast, screen-based polar alignment with ~30 arcsec precision from a Windows PC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM44EC Mount:\u003c\/strong\u003e Adds the high-precision RA encoder for Realtime PEC, for imagers who want the highest tracking accuracy and already have their own polar alignment method.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM44EC Mount w\/ iPolar:\u003c\/strong\u003e The complete package: RA encoder with Realtime PEC plus the internal iPolar, for dedicated astrophotographers chasing unguided or high-resolution imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eGo2Nova Control and Field-Ready Design: 212,000 Objects, Wi-Fi and 2 x 12V Power\u003c\/h3\u003e\n\u003cp\u003eThe proven Go2Nova® 8409 hand controller features a database of ~212,000 objects and a maximum slew speed of 4.5º\/sec. Built-in Wi-Fi connects the HEM44 to planetarium and session management software on your PC, tablet or smartphone, while a USB port and an ST-4 compatible autoguide port handle wired control, firmware updates and guide cameras.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Friction Brake:\u003c\/strong\u003e Locks the axes when power is cut, so your telescope cannot swing unexpectedly during setup or a power loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower-Down Memory:\u003c\/strong\u003e The mount remembers its position and alignment after a power loss, so you can resume without starting over.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Cable Management:\u003c\/strong\u003e Two 12V DC outputs (3A max) and one USB 2.0 port near the saddle reduce cable snags as the mount tracks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Saddle:\u003c\/strong\u003e The Vixen and Losmandy-style dovetail saddle accepts nearly any telescope optical tube.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHEM44 vs. Traditional GEMs: The StrainWave Advantage\u003c\/h3\u003e\n\u003cp\u003eStrainWave technology represents a significant shift from traditional German equatorial mount (GEM) designs. While a conventional worm-gear GEM offers a familiar platform for experienced imagers, the HEM44 offers a compelling alternative focused on portability.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraditional GEM Advantage:\u003c\/strong\u003e Many imagers are accustomed to the behavior of worm-gear systems, whose periodic error is well understood and easily managed with autoguiding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEM44 Advantage:\u003c\/strong\u003e The exceptional payload-to-weight ratio. A conventional GEM carrying 44 lbs needs a heavier head and heavy counterweights, while the HEM44's 13.65 lbs head runs counterweight-free for most setups, making it vastly easier to transport to remote dark-sky sites. The EC versions add Realtime PEC for tracking accuracy on top.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the HEM44 versions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAll versions share the same hybrid StrainWave drive, \u003cstrong\u003e44 lbs (20 kg)\u003c\/strong\u003e counterweight-free payload and Go2Nova® 8409 controller. The \u003cstrong\u003eHEM44EC\u003c\/strong\u003e adds a high-precision RA encoder that enables \u003cstrong\u003eRealtime PEC\u003c\/strong\u003e for smoother, more accurate tracking than the standard HEM44. Versions labelled \u003cstrong\u003ew\/ iPolar\u003c\/strong\u003e also include the internal iPolar electronic polar scope for \u003cstrong\u003e~30 arcsec\u003c\/strong\u003e polar alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the HEM44's hybrid strain wave design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn extremely high payload-to-weight ratio of \u003cstrong\u003e3.23\u003c\/strong\u003e. The iOptron HEM44 head weighs only \u003cstrong\u003e13.65 lbs\u003c\/strong\u003e but carries a \u003cstrong\u003e44 lbs\u003c\/strong\u003e telescope without counterweights. The StrainWave gear on RA provides zero-backlash, high-torque tracking, while the backlash-free worm\/belt DEC axis keeps cost and weight down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need counterweights for the iOptron HEM44 mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor payloads up to \u003cstrong\u003e44 lbs (20 kg)\u003c\/strong\u003e, the HEM44 does not require a counterweight or shaft. If your payload exceeds this, add the optional counterweight shaft (Φ20x200mm, M16 thread) and a 10 lbs counterweight to increase the maximum capacity to \u003cstrong\u003e55 lbs (25 kg)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I polar align the iOptron HEM44?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe iPolar versions include iOptron's internal iPolar electronic polar scope. It connects to a \u003cstrong\u003e64-bit Windows\u003c\/strong\u003e PC via USB 2.0 and guides you on screen to an alignment with \u003cstrong\u003e~30 arcsec\u003c\/strong\u003e precision, and it can plate-solve the star field near the pole even when Polaris is blocked by trees or buildings. With the other versions, use your own electronic polar alignment method.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the iOptron HEM44EC be used for unguided astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the EC versions are designed with unguided imaging in mind. The zero-backlash StrainWave drive combined with \u003cstrong\u003eRealtime PEC\u003c\/strong\u003e from the high-precision RA encoder can make unguided exposures of several minutes possible with a well-aligned mount and a short-to-medium focal length telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I control the iOptron HEM44 remotely?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEvery HEM44 version has \u003cstrong\u003ebuilt-in Wi-Fi\u003c\/strong\u003e, so you can connect and control it wirelessly from a computer, tablet or smartphone using compatible planetarium or imaging software. The \u003cstrong\u003eGo2Nova® 8409\u003c\/strong\u003e hand controller provides full GoTo control in the field and has a USB port for a direct, wired connection to a PC.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the iOptron HEM44 handle an 8\" SCT for imaging nebulae like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. A typical 8\" Schmidt-Cassegrain weighs between \u003cstrong\u003e12-15 lbs\u003c\/strong\u003e, well under the HEM44's \u003cstrong\u003e44 lbs\u003c\/strong\u003e counterweight-free capacity. That leaves plenty of room for a camera, guide scope and accessories, making it an excellent portable platform for deep-sky imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Type\u003c\/td\u003e\n\u003ctd\u003eHybrid Strain Wave Equatorial Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRA Gear System\u003c\/td\u003e\n\u003ctd\u003eStrainWave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDEC Gear System\u003c\/td\u003e\n\u003ctd\u003eBacklash-free worm\/belt system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRA Reduction Ratio\u003c\/td\u003e\n\u003ctd\u003e640:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload (No Counterweight)\u003c\/td\u003e\n\u003ctd\u003e44 lbs (20 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload (With Counterweight)\u003c\/td\u003e\n\u003ctd\u003e55 lbs (25 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Weight\u003c\/td\u003e\n\u003ctd\u003e13 lbs (5.9 kg) w\/o saddle, 13.65 lbs (6.2 kg) with saddle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload to Mount Weight Ratio\u003c\/td\u003e\n\u003ctd\u003e3.23\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive Motor\u003c\/td\u003e\n\u003ctd\u003eStepper motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive Period\u003c\/td\u003e\n\u003ctd\u003e270 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Precision Encoder\u003c\/td\u003e\n\u003ctd\u003eYes, RA axis (EC versions); none (non-EC versions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeriodic Error Correction (PEC)\u003c\/td\u003e\n\u003ctd\u003eRealtime PEC via RA encoder (EC versions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStructure Material\u003c\/td\u003e\n\u003ctd\u003eAll metal, CNC machined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eAnodized black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLatitude Adjustment Range\u003c\/td\u003e\n\u003ctd\u003e15º ~ 65º\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAzimuth Adjustment Range\u003c\/td\u003e\n\u003ctd\u003e± 6º\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Saddle\u003c\/td\u003e\n\u003ctd\u003eVixen \u0026amp; Losmandy dual saddle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLevel Indicator\u003c\/td\u003e\n\u003ctd\u003eLevel bubble\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl System\u003c\/td\u003e\n\u003ctd\u003eGoToNova® \/ Commander\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHand Controller\u003c\/td\u003e\n\u003ctd\u003eGo2Nova® 8409\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObject Database\u003c\/td\u003e\n\u003ctd\u003e~212,000 objects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTracking\u003c\/td\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Slew Speed\u003c\/td\u003e\n\u003ctd\u003e4.5º\/sec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Requirement\u003c\/td\u003e\n\u003ctd\u003eDC 12V, 5A (5.5\/2.5mm plug)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.6A (Tracking), 1.2A (GoTo)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Adapter\u003c\/td\u003e\n\u003ctd\u003e100V ~ 240V (included, indoor use only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Off Brake\u003c\/td\u003e\n\u003ctd\u003eElectronic friction brake\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Down Memory\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBuilt-in Wi-Fi\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003eWi-Fi and USB (via Hand Controller)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoguide Port\u003c\/td\u003e\n\u003ctd\u003eYes (ST-4 compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable Management\u003c\/td\u003e\n\u003ctd\u003e2 x 12V (3A max), 1 x USB 2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectronic Polar Scope\u003c\/td\u003e\n\u003ctd\u003eInternal iPolar, ~30 arcsec precision (iPolar versions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperation Temperature\u003c\/td\u003e\n\u003ctd\u003e-20ºC ~ 40ºC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTripod\u003c\/td\u003e\n\u003ctd\u003eOptional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCounterweight Shaft\u003c\/td\u003e\n\u003ctd\u003eOptional (Φ20x200mm, M16 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCounterweight\u003c\/td\u003e\n\u003ctd\u003eOptional (10 lbs \/ 4.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHEM44 Mount Head\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (non-EC versions)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHEM44EC Mount Head with RA Encoder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (EC versions)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eGo2Nova® 8409 Hand Controller\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAC Power Adapter (100-240V)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHand Controller Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eUSB Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInternal iPolar Electronic Polar Scope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (iPolar versions)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.ioptron.com\/category-s\/133.htm\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/iOptron_iPolar_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload iPolar Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"HEM44 Mount","offer_id":44968061370653,"sku":"IOP-H442","price":4087.0,"currency_code":"CAD","in_stock":true},{"title":"HEM44 Mount w\/ iPolar","offer_id":44968061403421,"sku":"IOP-H442A","price":4311.0,"currency_code":"CAD","in_stock":true},{"title":"HEM44EC Mount","offer_id":52917264679197,"sku":"IOP-H444","price":6159.0,"currency_code":"CAD","in_stock":true},{"title":"HEM44EC Mount w\/ iPolar","offer_id":44968061436189,"sku":"IOP-H444A","price":6383.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/iOptron-HEM44-Mount__87208.1667498696.1280.1280.jpg?v=1684348521"},{"product_id":"ioptron-hem27-hem44-counterweight-bar","title":"iOptron HEM27\/HEM44 Counterweight Bar","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eOfficial iOptron accessory for HEM series mounts\u003c\/li\u003e\n\u003cli\u003eEnables balancing of heavier telescope payloads\u003c\/li\u003e\n\u003cli\u003eCompatible with iOptron HEM27 and HEM44 mounts\u003c\/li\u003e\n\u003cli\u003eFeatures an integrated safety lock to prevent counterweight slippage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eiOptron HEM27\/HEM44 Counterweight Bar\u003c\/h2\u003e\n\u003cp\u003eThe iOptron HEM27\/HEM44 Counterweight Bar is the official shaft required to add counterweights to your iOptron HEM27 or HEM44 hybrid equatorial mount. While these mounts are designed for counterweight-free operation with lighter payloads, this bar is essential for balancing heavier optical tubes or complex imaging trains. It ensures your mount can achieve optimal tracking accuracy and stability when loaded closer to its maximum capacity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure Balancing for Your iOptron HEM27 or HEM44 Mount\u003c\/h3\u003e\n\u003cp\u003eThis counterweight bar threads directly into the declination axis of your HEM27 or HEM44 mount, providing a robust and secure platform for standard counterweights. An integrated safety lock at the end of the shaft acts as a critical fail-safe, preventing weights from accidentally sliding off during setup, balancing, or transport. This simple component unlocks the full payload potential of your mount for serious astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen do I need the Counterweight Bar for my iOptron HEM27 or HEM44 mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need the \u003cstrong\u003eiOptron HEM27\/HEM44 Counterweight Bar\u003c\/strong\u003e when your telescope and imaging equipment approach or exceed the mount's specified payload for counterweight-free operation. Adding counterweights is necessary to maintain balance, reduce strain on the drive motors, and ensure precise tracking for astrophotography with heavier setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the safety lock on the iOptron HEM27\/HEM44 Counterweight Bar?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe integrated safety lock is a small but crucial feature that prevents your counterweights from sliding off the end of the bar. This protects your equipment from falling and potential damage, especially if the counterweight's locking knob becomes loose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the iOptron HEM27\/HEM44 Counterweight Bar required for visual observing with a small refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLikely not. The primary advantage of the HEM mounts is their ability to handle lighter payloads, such as a small refractor for visual use, without any counterweights. This bar is intended for users with heavier telescopes, such as larger refractors, Newtonians, or SCTs, especially when adding cameras and other imaging accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use third-party counterweight shafts with my iOptron HEM27 or HEM44 mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is strongly recommended to use the official \u003cstrong\u003eiOptron HEM27\/HEM44 Counterweight Bar\u003c\/strong\u003e. This ensures proper threading, fit, and compatibility with the mount's design. Using third-party accessories may result in an insecure fit or damage to the mount's threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does adding counterweights with the iOptron HEM27\/HEM44 bar improve astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eProperly balancing your telescope with counterweights significantly improves tracking accuracy. It reduces the workload on the mount's motors, leading to smoother guiding, rounder stars, and the ability to capture sharper long-exposure images of deep-sky objects like the Orion Nebula (M42).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this the correct counterweight bar for the iOptron HAE series mounts?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This counterweight bar is specifically designed for the \u003cstrong\u003eiOptron HEM27 and HEM44\u003c\/strong\u003e mounts. The HAE series mounts require their own specific counterweight bar, as the mounting threads and design are different.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eiOptron HEM27, HEM44 Mounts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHEM27\/HEM44 Counterweight Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":48603563753757,"sku":"IOP-8456SL","price":63.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/IOP-8456SL.jpg?v=1717695215"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/ioptron-hem-hybrid-strain-wave-mounts.oembed","provider":"David Astro","version":"1.0","type":"link"}