{"product_id":"askar-fra-400-mm-f-5-6-quintuplet-petzval-apo-astrograph-fra400-5-6","title":"Askar FRA400 - 400 mm f\/5.6 Quintuplet Petzval APO Astrograph - FRA400","description":"\u003ch4 style=\"text-align: left;\"\u003e\u003cspan style=\"color: #f01414;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAskar FRA 400 mm - f\/5.6 Quintuplet - Petzval APO Astrograph\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eQuintuplet Petzval Lens Astrograph\u003c\/li\u003e\n\u003cli\u003e400 mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72 mm Aperture; f\/5.6\u003c\/li\u003e\n\u003cli\u003eFull-frame 44 mm Image Circle\u003c\/li\u003e\n\u003cli\u003eGenerous 140 mm Back Focus\u003c\/li\u003e\n\u003cli\u003eWith 2\" and 1.25\" diagonal\/eyepiece for visual use\u003c\/li\u003e\n\u003cli\u003e3\" Big Focuser with microfine adjuster control\u003c\/li\u003e\n\u003cli\u003e360° Rotator mechanism included\u003c\/li\u003e\n\u003cli\u003eM68x1 - M48 Adapter Included - Fits most cameras\u003c\/li\u003e\n\u003cli\u003eMulti-Function Tube Rings - Use with accessories\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis 72mm Astrograph from Askar, the FRA400\/5.6, is a refractive system designed for flat-field astro-imaging applications. The FRA designation stands for \"Flatfield Refractive Astrograph\". While this optical system can also be used for fine, highest quality APO visual observations with your own star diagonal and eyepieces, it really shines when used with your own camera for astrophotography purposes. It provides a super flat field image with versatile high-quality APO images of celestial objects.\u003c\/p\u003e\n\u003cp\u003eThis excellent and amazing design of Askar's first FRA series product is a quintuplet Petzval-like telescope with a 400 mm focal length, f\/5.6 and 72 mm aperture, including two special ED glasses which have been used. A 44 mm full frame image circle is supported. The Askar FRA 400 mm - f\/5.6 Quintuplet - Petzval APO Astrograph (telescope) tube, with its push-fit dew shield, and a 3\" large rack-and-pinion focuser for microdriving adjustment in astrophotography and observation with a 360° rotator and 2\" adapter ring and 1.25\" eyepiece adapter with M68x1 thread provides features for a variety of applications.\u003c\/p\u003e\n\u003cp\u003eIt’s optical design is excellent in controlling and possibly avoiding chromatic aberrations, the image quality is also optimized to satisfy the a wide array of customers requirements for visual and photographic applications. Full APO image quality is assured for either visual observing or for astro-imaging use.\u003c\/p\u003e\n\u003cp\u003eFRA 400\/5.6 has a pair of patented multifunctional attachment tube rings. Besides being stylish and beautiful, the FRA shows well-conceived design and the rings provide a practical three-sided mounting platform, which is convenient for attaching various accessories for photography. Includes rotatable 3” rack-and-pinion focuser, M68-M48 adapter, 2” adapter ring, and 1.25”-2” adapter mounting rings, Vixen-style dovetail, and carrying handle.\u003c\/p\u003e\n\u003cp\u003eA focal ratio of f\/5.6 is relatively ‘fast’ for visual telescope or astrophotography purposes, however, in order to meet the needs of pro-level astronomers, Askar has specially designed an optional ultra-short \u003cstrong\u003e\u003cspan style=\"color: red;\" color=\"red\"\u003e\u003ca href=\"askar-f-3-9-reducer-for-fra400-refractor\" title=\"Askar f\/3.9 Focal Reducer for FRA400\" target=\"_blank\"\u003ef\/3.9 focal reducer\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e for the FRA400\/5.6 which allows you to achieve an optically faster F3.9 focal ratio to reduce the exposure time.  Full frame is also supported when the reducer is added, which is very rare for refractor telescopes.\u003c\/p\u003e\n\u003cp\u003eThis Askar FRA 400\/5.6 APO Astrograph has a back focus of 140 mm, no need to calculate the distance, when attaching your photographic equipment, so you will conveniently see an in-focus image. Being stocky. robust, and portable in its mechanical design, this Askar FRA 400\/5.6 Astrograph can combine with various accessories you have, to accommodate numerous tasks. It also is very simple to use, and you will discover that this is an effective and very versatile photo\/visual companion for your astronomy needs.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eSpecifications:\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer:\u003c\/td\u003e\n\u003ctd\u003eAskar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMfr. SKU #:\u003c\/td\u003e\n\u003ctd\u003eFRA400-5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction:\u003c\/td\u003e\n\u003ctd\u003eAstrograph; Petzval Quintuplet Lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrime Use For:\u003c\/td\u003e\n\u003ctd\u003eAstro-imaging, Astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture:\u003c\/td\u003e\n\u003ctd\u003e72 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length:\u003c\/td\u003e\n\u003ctd\u003e400 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio:\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective:\u003c\/td\u003e\n\u003ctd\u003eQuintuplet, Dual ED Air-spaced APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle:\u003c\/td\u003e\n\u003ctd\u003e44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus:\u003c\/td\u003e\n\u003ctd\u003e140 mm (from end of rotator thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRotator Included:\u003c\/td\u003e\n\u003ctd\u003eYes, Rotator Built-in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOAL Length:\u003c\/td\u003e\n\u003ctd\u003e317 mm (12.48 inches)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight:\u003c\/td\u003e\n\u003ctd\u003e2.56 kg (5.64 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptions Weight:\u003c\/td\u003e\n\u003ctd\u003e2.88 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Adapter:\u003c\/td\u003e\n\u003ctd\u003eM68x1 Male thread, 2\"\/1.25\" Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessories:\u003c\/td\u003e\n\u003ctd\u003ePair of Tube Rings w\/Handle, a Dovetail Plate, an Inspection List from factory, User Manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":32285187801201,"sku":"ASK-FRA400","price":1079.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/Askar400-5.6FRA.jpg?v=1776459288","url":"https:\/\/khanscope.com\/en-fr\/products\/askar-fra-400-mm-f-5-6-quintuplet-petzval-apo-astrograph-fra400-5-6","provider":"Khan Scope Centre","version":"1.0","type":"link"}