{"product_id":"askar-fra600-108mm-f-5-6-quintuplet-petzval-flat-field-astrograph","title":"Askar FRA600 108mm f\/5.6 Quintuplet Petzval Flat-Field Astrograph","description":"\u003cdiv\u003e\u003cspan\u003e\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e Quick Overview\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e               ASKAR FRA600 Quintuplet refractor with 108mm aperture and f\/5.6 focal ratio, ideal for wide-field deep sky imaging\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Petzval design ensures flat field across big 66mm image circle, while two ED elements virtually eliminate chromatic aberration\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Rotatable 4.2” rack-and-pinion focuser, M90-M54 and M54-M48 adapters, 2” adapter ring, and 1.25”-2” adapter\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Includes mounting rings, Losmandy-style dovetail, carrying handle, and hard case\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e Product Details\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e          Like its smaller sibling, the 72mm FRA400, the FRA600 “Flatfield Refractive Astrograph” incorporates a five-element design to deliver flat fields and sharp, color-free images from edge-to-edge. With a 108mm objective, two ED elements, and Petzval optical layout, this f\/5.6 scope has a focal length of 600mm and it’s ideal for capturing stunning wide-field images of the deep sky over a huge 66mm full-frame image circle.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    This premium astrograph includes a large 4.2” rack-and-pinion dual-speed (1:10) focuser that’s fully rotatable through 360 degrees. The focuser tube terminates with an M90x1 thread, and it comes with an M90x1 to M54x0.75 adapter and M54x0.75 to M48x0.75 conical extension tube for direct camera attachment. It also includes a 2” adapter ring and 1.25”-2” adapter for use with diagonals, eyepieces, or smaller cameras. The scope works great for visual observing (star diagonal not included).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    The attractive optical tube of the FRA600 is complemented with a highly functional set of aluminum rings, \"D\" Losmandy-style dovetail, and a carrying handle. The width of the \"D\" rail is 73.2mm. Please make sure that your saddle can clamp down to this size (for example, some ADM saddles will not go under 75mm and will not clamp on to this scope).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    The rings include separate mounting holes for additional accessories. The entire tube has a diameter of 120mm and has a length of just 493mm with the dew shield retracted. It weighs 6.5kg. This astrograph has a back focus of 160mm which leaves ample room for accessories.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    While the fast f\/5.6 focal ratio is ideal for deep-sky imaging, ASKAR also makes an optional focal reducer (not included) for the FRA600 scope to bring the focal ratio to f\/3.9 and focal length to 420mm while still supporting full-frame imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    For the price, this fast apochromatic telescope offers excellent value and can approach the performance of telescopes that cost three or four times as much. This is especially true when matched with astronomy cameras with smaller 1\" and 4\/3\" sensors. Cameras with larger APS-C and full-frame sensors may reveal slight aberrations at the edge of the field, especially when using the focal reducer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    The telescope is shipped in a foam-fitted hardcase (22.6\" x 12.5\" x 11\").\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    The ASKAR FRA600 offers excellent value in a premium larger-aperture astrograph for serious astronomical imaging!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    Specifications:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e         Aperture: 108mm \/ 4.25\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Focal length: 600mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Focal ratio: f\/5.6\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Objective type: Quintuplet flat-field Apo (including 2 ED elements)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Image circle: 66mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Back focus: 160mm (from the end of rotator M90x1 thread)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Overall length: 493mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Tube weight: 6.5 kg \/ 14.3 lbs\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Back-end adapter: M108x1 male thread (no rotator), M90x1 male thread, 2\" adapter, 1.25\" adapter\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Conical adapter: M90x1 to M54x0.75, M54x0.75 to M48x0.75\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     Accessories: a pair of tube rings, handle, dovetail plate, conical tube adapter (with M54x0.75 and M48x0.75 male threads, checklist, and manual), and hard case\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e     0.7x f\/3.9 reducer sold separately\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e    \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e","brand":"mickcara","offers":[{"title":"000","offer_id":41341869523081,"sku":"01715-1","price":4789.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0365\/2131\/2393\/files\/589b254426cd8bf004cb068649f3eeca.jpg?v=1691311458","url":"https:\/\/mickcara.com\/products\/askar-fra600-108mm-f-5-6-quintuplet-petzval-flat-field-astrograph","provider":"mickcara","version":"1.0","type":"link"}