{"product_id":"askar-151phq","title":"Askar 151PHQ f\/7 Quadruplet Astrograph","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e151mm Aperture Quadruplet APO Optics\u003c\/li\u003e\n\u003cli\u003e1057mm Focal Length at f\/7\u003c\/li\u003e\n\u003cli\u003eIntegrated Flattener for a 60mm Image Circle\u003c\/li\u003e\n\u003cli\u003eIncludes Two ED Glass Elements for Color Correction\u003c\/li\u003e\n\u003cli\u003e13.7kg Total Weight with Rings and 300mm Dovetail Plate\u003c\/li\u003e\n\u003cli\u003eFour-Piece Adapter Set for Direct Camera Connection\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\u003eAskar 151PHQ f\/7 Quadruplet Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar 151PHQ combines a massive 151mm aperture with an integrated flat-field quadruplet optical design, delivering a 1057mm focal length at a native f\/7. This astrograph is engineered to illuminate a 60mm image circle without requiring an external flattener, eliminating complex backfocus calculations. With two ED glass elements for superior color correction and a total weight of 13.7kg, the 151PHQ provides the light-gathering power and image scale for capturing detailed, wide-field views of deep-sky objects.\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\u003e151mm f\/7 Quadruplet APO Optics with 2 ED Elements\u003c\/h3\u003e\n\u003cp\u003eThe heart of the 151PHQ is its air-spaced quadruplet objective, which uses two extra-low dispersion (ED) glass elements to achieve apochromatic correction. This design aggressively suppresses chromatic aberration, ensuring stars are rendered as sharp, color-pure points without distracting halos. At 151mm of aperture and a 1057mm focal length, this instrument captures faint details on galaxies and nebulae with high resolution, making it ideal for serious deep-sky imagers.\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\u003eA 60mm Flat Field: No External Flattener Required\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional refractors, the 151PHQ features a built-in field flattener as part of its core optical design. This Petzval-like configuration produces a corrected, flat 60mm image circle, fully illuminating large full-frame and medium-format sensors without any additional hardware. You can attach your camera directly via the included adapters and start imaging, confident that stars will remain round and sharp from the center to the corners of your frame.\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\u003eImaging-Ready Mechanics: 13.7kg OTA with a 3.4\" Focuser\u003c\/h3\u003e\n\u003cp\u003eEngineered for stability, the 151PHQ weighs 11.6kg as an OTA and 13.7kg fully equipped with its tube rings and 300mm Losmandy-style dovetail plate. This substantial build requires a high-capacity mount but rewards you with a rigid imaging platform. The heavy-duty 3.4-inch rack-and-pinion focuser provides precise, no-slip control over focus, even with heavy camera payloads, and includes a 360° rotator for effortless image framing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopic Dew Shield:\u003c\/strong\u003e Contracts the OTA length to 930.3mm for transport and extends to 1117.8mm to block stray light and prevent dew formation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-Machined Tube:\u003c\/strong\u003e The entire optical tube is built for rigidity and thermal stability, ensuring focus remains consistent throughout an imaging session.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder Base:\u003c\/strong\u003e A standard finder shoe is included for attaching your preferred guide scope or finder.\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\u003eComplete Mounting \u0026amp; Connection System: 300mm Plate and 4 Adapters\u003c\/h3\u003e\n\u003cp\u003eThe 151PHQ arrives ready to integrate into your setup. It includes a pair of robust tube rings, a multi-function carrying handle, and a 300mm Losmandy-style dovetail plate for secure attachment to your mount. To connect your camera, a set of four threaded adapters is provided, stepping down from the focuser's native M86x1 thread to the universal M48x0.75 thread used by most cameras and filter wheels.\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\u003eAskar 151PHQ vs. 130PHQ: Aperture and Portability\u003c\/h3\u003e\n\u003cp\u003eAs the largest instrument in Askar's PHQ line, the 151PHQ is the direct successor to the popular 130PHQ for imagers seeking more resolving power and light grasp.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar 130PHQ Advantage:\u003c\/strong\u003e The 130PHQ is significantly lighter and more compact. Its lower weight makes it compatible with a wider range of medium-payload mounts, offering greater portability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar 151PHQ Advantage:\u003c\/strong\u003e With a 151mm objective, the 151PHQ gathers 34% more light than the 130mm model, allowing you to capture fainter details or reduce exposure times. Its longer 1057mm focal length also provides greater image scale, making it better suited for resolving details in smaller galaxies and planetary nebulae.\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\"\u003eDoes the Askar 151PHQ require a separate field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Askar 151PHQ has a \u003cstrong\u003ebuilt-in flattener\u003c\/strong\u003e as part of its quadruplet optical design. It produces a flat 60mm image circle natively, so you do not need to purchase or calculate backfocus for an external flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of astronomical mount is needed for the Askar 151PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a total weight of \u003cstrong\u003e13.7kg (30.2 lbs)\u003c\/strong\u003e plus the weight of your camera and guide scope, a heavy-duty mount is essential. Look for mounts with an instrumental capacity of at least 50-60 lbs (22-27 kg) to ensure stable, precise tracking for long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 151PHQ frame large targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1057mm focal length\u003c\/strong\u003e provides an ideal image scale for large galaxies and nebulae when paired with a full-frame sensor. On a typical full-frame camera, M31 will be tightly framed, showcasing its core, dust lanes, and outer arms in a single, high-resolution shot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 60mm image circle of the 151PHQ mean for my camera choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe large \u003cstrong\u003e60mm image circle\u003c\/strong\u003e fully illuminates sensors up to medium format size without vignetting. This makes the 151PHQ compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-Frame (36x24mm) DSLR\/Mirrorless and Astro Cameras:\u003c\/strong\u003e These will be fully covered with excellent corner-to-corner star quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedium-Format (e.g., 55mm diagonal) Astro Cameras:\u003c\/strong\u003e Even the largest consumer sensors will be illuminated, allowing you to capture immense fields of view.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 151PHQ's 1057mm focal length good for smaller galaxies like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e1057mm focal length\u003c\/strong\u003e provides excellent image scale for resolving details in medium-to-small deep-sky objects. With the 151mm aperture, you can capture the spiral structure of M51, the bridge connecting it to its companion galaxy NGC 5195, and individual HII regions with impressive clarity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the quadruplet design in the Askar 151PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe four-element (quadruplet) design with \u003cstrong\u003etwo ED glass elements\u003c\/strong\u003e allows for a higher degree of optical correction than simpler doublet or triplet designs. It corrects for chromatic aberration (color fringing), spherical aberration, and field curvature simultaneously, resulting in a sharp, flat, color-pure image across the entire 60mm field without needing extra accessories.\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\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e151mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1057mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Design\u003c\/td\u003e\n\u003ctd\u003eQuadruplet Air-Spaced APO (with 2 ED elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e11.6 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e13.7 kg (including tube rings \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (Observing)\u003c\/td\u003e\n\u003ctd\u003e930.3mm (dew shield contracted) to 1117.8mm (dew shield stretched)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (Imaging)\u003c\/td\u003e\n\u003ctd\u003e976.8mm (dew shield contracted) to 1164.3mm (dew shield stretched)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Adapters\u003c\/td\u003e\n\u003ctd\u003eM86×1 to M68×1\u003cbr\u003eM68×1 to M54×0.75\u003cbr\u003eM54×0.75 to M54×0.75\u003cbr\u003eM54×0.75 to M48×0.75 (with M48 filter thread)\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\"\u003e151PHQ OTA\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\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\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\"\u003eCarrying Handle\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\"\u003eAskar Losmandy 300mm Dovetail Plate\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\"\u003e4-Piece Photographic Adapter Set\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\"\u003eAluminum Hard Case\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\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_151PHQ_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 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\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\/Askar_151PHQ_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 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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":52851326157085,"sku":"ASK-151PHQ","price":6299.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-151PHQ-1_a71134c0-c394-423b-9744-ec15cd536a28.jpg?v=1788401651","url":"https:\/\/davidastro.com\/fr\/products\/askar-151phq","provider":"David Astro","version":"1.0","type":"link"}