{"product_id":"askar-fra600-108mm-f-5-6-quintuplet-apo-fra600","title":"Askar FRA600 108mm f\/5.6 Quintuplet APO (FRA600)","description":"\u003ch1\u003eAskar FRA600 108mm f\/5.6 Quintuplet APO\u003c\/h1\u003e\n\u003cdiv\u003e\n\u003cdiv\u003eToday Sharpstar announces the newest addition to its Askar FRA series, the Askar FRA600\/5.6. Following the excellent optical performance of its first FRA400\/5.6, the FRA600\/5.6 is an evolution of the FRA series, an upgraded lens has a 108mm aperture and a 600mm focal length, the f\/ratio is still f\/5.6, and the image circle is 66mm surpass the full frame!\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThis FRA600 Quintuplet Refractor is also built on a Petzval design, offering a front triplet and rear doublet lens constructed of 5-element, includes two ED elements. This combination provides a high level of apochromatic performance for astroimaging.\u003c\/div\u003e\n\u003cdiv\u003eWith wonderful optics design, the FRA600 telescope provides a 66mm image circle to ensure excellent star shape across the entire flat field whilst controlling chromatic aberration, minimizing the distortion.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe two lens in the rear group have a 80mm diameter, effectively reduces the occurrence of decreased field illumination. With the precision lens manufacturing, it obtains theoretical optimal pinpoint stars, bringing you beautifully round stars and clean detail image.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe FRA600 comes fitted with a large 4.2\" rack and pinion focuser and includes the standard 1:10 micro-adjustment knob, the focuser lift the payload to a pro level, offers smoothly operation when heavy imaging equipment and accessories are attached, without slipping, becomes a performance upgrade.\u003c\/div\u003e\n\u003cdiv\u003eThe focuser allows multiple connection thread. Askar offers a standard conical extension tube with M54x0.75 and M48x0.85 thread to connect various photography equipments. \u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003eMechanically, the FRA600 has a tube diameter of 120mm and a retractable dew-shield. With the dew-shield retracted, the total length is only 493mm, making it a great portable 4\" astrograph.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eA set of multifunctional red anodized tube rings that include mounting points on three sides, makes it easy to attach accessories such as guider scope for backyard viewing.\u003c\/div\u003e\n\u003cdiv\u003eIn addition to supporting wide field astrophotography, the FRA600 is also perfect for high quality observation, provides complete lack of chromatic aberration and create images with impressive contrast of realistic visual experience.\u003c\/div\u003e\n\u003cdiv\u003eIf the FRA600 is just a triplet APO refractor, then the price is reasonable, but the FRA600 is a 4.3\" Quintuplet Super APO FRA600 Astrograph, its build and finish are unprecedented for an astrograph in this price range, moreover, the FRA600 offers cost-effective superb performance, is a pleasure to use. \u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cul\u003e\n\u003cli\u003eAperture: 108mm \/ 4.25\"\u003c\/li\u003e\n\u003cli\u003eFocal length: 600mm\u003c\/li\u003e\n\u003cli\u003eFocal ratio: f\/5.6\u003c\/li\u003e\n\u003cli\u003eObjective type: Quintuplet flat-field Apo (including 2 ED elements)\u003c\/li\u003e\n\u003cli\u003eImage circle: 66mm\u003c\/li\u003e\n\u003cli\u003eBack focus: 160mm (from the end of rotator M90x1 thread)\u003c\/li\u003e\n\u003cli\u003eOverall length: 493mm\u003c\/li\u003e\n\u003cli\u003eTube weight: 6.5 kg \/ 14.3 lbs\u003c\/li\u003e\n\u003cli\u003eBack-end adapter: M108x1 male thread (no rotator), M90x1 male thread, 2\" adapter, 1.25\" adapter\u003c\/li\u003e\n\u003cli\u003eConical adapter: M90x1 to M54x0.75, M54x0.75 to M48x0.75\u003c\/li\u003e\n\u003cli\u003eAccessories: 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\/li\u003e\n\u003cli\u003e0.7x f\/3.9 reducer sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAskar FRA600\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eA pair of tube rings,\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eHandle\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eLosmandy dovetail plate\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eConical Extender\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eManual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAskar Warranty\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":43125830287589,"sku":"ASK-FRA600","price":3639.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/askar-fra600-108mm-f5-6-quintuplet-apo-fra600-astronomy-plus_5b9f9ee7-ef5e-4e09-8476-34d7b277ad58.png?v=1690487057","url":"https:\/\/istronomyplus.com\/products\/askar-fra600-108mm-f-5-6-quintuplet-apo-fra600","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}