{"product_id":"shelyak-pf0021v","title":"Shelyak LISA Spectroscope (VIS)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for spectroscopy of faint deep-sky objects\u003c\/li\u003e\n\u003cli\u003eFast optical design optimized for modern telescopes\u003c\/li\u003e\n\u003cli\u003eInterchangeable slits to balance resolution and brightness\u003c\/li\u003e\n\u003cli\u003eMirror slit design for accurate target acquisition and guiding\u003c\/li\u003e\n\u003cli\u003eLightweight 1.4 kg chassis\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\u003eLISA Spectroscope (VIS)\u003c\/h2\u003e\n\u003cp\u003eThe LISA Spectroscope is a lightweight 1.4 kg instrument designed for the scientific analysis of faint celestial objects from comets to quasars. It features a 4 mm long slit and an optical system with custom-made components, enabling you to capture detailed spectra of targets like novae, supernovae, and the redshift of distant galaxies.\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\u003eEngineered for Faint Object Spectroscopy\u003c\/h3\u003e\n\u003cp\u003eThe LISA's optical path is specifically engineered for low-light targets. Its fast focal ratio makes it an ideal match for telescopes operating natively at f\/5, or for Schmidt-Cassegrain and Ritchey-Chrétien systems paired with a focal reducer. This design maximizes throughput for challenging subjects such as faint variable stars or confirming planetary nebulae.\u003c\/p\u003e\n\u003cp\u003eWith a resolving power of approximately 1,000, the LISA separates spectral lines with enough detail for serious scientific work. Its spectral range covers the entire visible spectrum and extends into the near-ultraviolet and near-infrared, providing broad coverage for a wide variety of astronomical targets.\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\u003eMirror Slit and Interchangeable Slits\u003c\/h3\u003e\n\u003cp\u003eAcquiring and holding a faint object on a narrow slit is a primary challenge in spectroscopy. The LISA incorporates a mirror slit that allows you to see the entire starfield, making it simple to accurately position your target. For long exposures, a C-mount guide port allows you to connect an autoguiding camera to maintain perfect tracking.\u003c\/p\u003e\n\u003cp\u003eTo adapt to different targets and conditions, the LISA includes a standard set of four interchangeable slits (15, 19, 23, and 35µm). This allows you to prioritize high resolution for brighter objects or greater light throughput for the faintest targets. Additional specialized slits, such as wide or photometric versions, are available separately to further expand the instrument's capabilities.\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\u003eStandardized Telescope and Camera Interfaces\u003c\/h3\u003e\n\u003cp\u003eThe LISA connects to your telescope via a standard 2\" nosepiece, which is included. This nosepiece can be removed to expose a female M42x0.75 T-thread for more rigid connections. The imaging camera also connects via a T-thread, with a backfocus of 54.9 mm to accommodate filter wheels and other accessories.\u003c\/p\u003e\n\u003cp\u003eThe dedicated guiding camera port uses a standard C-mount thread with a 17.5 mm backfocus. For users of ATIK cameras, the LISA also includes a 13 mm T-thread extension ring to ensure the sensor is placed at the correct distance from the optics.\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\"\u003eWhat kind of objects is the LISA Spectroscope designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LISA Spectroscope is optimized for faint deep-sky objects. Its primary targets include \u003cstrong\u003ecomets, novae, supernovae, faint variable stars, distant galaxies, and quasars\u003c\/strong\u003e. It is an ideal instrument for pro-am research and scientific characterization of these challenging targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescope do I need to use the LISA Spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LISA performs best with telescopes that have a fast focal ratio, around f\/5. It can be used directly on instruments with this native focal ratio. For telescopes with longer focal ratios, such as most \u003cstrong\u003eSchmidt-Cassegrains or Ritchey-Chrétiens (f\/8 to f\/10)\u003c\/strong\u003e, you will need to use a \u003cstrong\u003efocal reducer\u003c\/strong\u003e to achieve optimal performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I keep a star centered on the LISA Spectroscope's slit for long exposures?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LISA Spectroscope features two key systems for this. First, its \u003cstrong\u003emirror slit\u003c\/strong\u003e allows you to see the starfield around the slit for easy initial positioning. Second, it has a dedicated \u003cstrong\u003eC-mount guide port\u003c\/strong\u003e, allowing you to attach an autoguiding camera that sends corrections to your mount, keeping the target perfectly centered automatically.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I change the resolution of the LISA Spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The LISA comes with a set of four interchangeable slits of different widths. Using a narrower slit provides higher spectral resolution, which is ideal for separating close spectral lines on brighter targets. A wider slit allows more light to pass through, which is better for capturing a signal on very faint objects at the cost of lower resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the LISA Spectroscope to study a supernova like SN 2023ixf in the Pinwheel Galaxy (M101)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a faint target like a supernova in a distant galaxy, you would likely select one of the wider slits (e.g., 23µm or 35µm) to maximize light throughput. You would use the mirror slit to locate the supernova within M101 and position it precisely. For the necessary long exposures, an autoguiding camera attached to the C-mount port would be essential to ensure the target does not drift off the slit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the LISA Spectroscope with my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will need two accessories for optimal results. First, you'll need a \u003cstrong\u003efocal reducer (e.g., 0.63x or 0.5x)\u003c\/strong\u003e to shorten your SCT's focal ratio to be closer to f\/5. Second, for a secure mechanical connection to the SCT's rear cell, you will need a specific adapter like the Shelyak BA0027 variable T-adapter instead of the standard 2\" nosepiece.\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\u003eSlit Length\u003c\/td\u003e\n\u003ctd\u003e4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.4 kg (without camera)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolving Power\u003c\/td\u003e\n\u003ctd\u003e~1,000 (with 23 µm slit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpectral Range\u003c\/td\u003e\n\u003ctd\u003e400 - 700 nm (extends to near-UV\/IR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003ef\/5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Slits\u003c\/td\u003e\n\u003ctd\u003e15, 19, 23, 35 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e2\" Nosepiece or M42x0.75 T-thread (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImaging Camera Connection\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 T-thread (male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImaging Camera Backfocus\u003c\/td\u003e\n\u003ctd\u003e54.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuiding Camera Connection\u003c\/td\u003e\n\u003ctd\u003eC-mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuiding Camera Backfocus\u003c\/td\u003e\n\u003ctd\u003e17.5 mm\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\"\u003eLISA Spectroscope\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\"\u003eInterchangeable Slit Holder with 4 Slits (15, 19, 23, 35µm)\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\"\u003e2\" Telescope Nosepiece\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\"\u003e13mm T-thread Extension Ring (for ATIK cameras)\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\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_LISA_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\"\u003eShelyak LISA Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.shelyak.com\/software\/?lang=en\" 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/shelyak-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eShelyak 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":52943037530397,"sku":"SHK-PF0021V","price":4987.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-LISA-Spectroscope-VIS-1_8002f53b-c8de-4ff5-ad2b-60eccfc54f16.jpg?v=1789616078","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-pf0021v","provider":"David Astro","version":"1.0","type":"link"}