{"product_id":"askar-131f-131mm-large-aperture-f7-5-flat-field-astronomical-telescope-self-flattened-quadruplet-astrograph","title":"ASKAR 131F 131MM Large Aperture F7.5 Flat-Field Astronomical Telescope Self-flattened Quadruplet Astrograph","description":"\u003cp\u003e\u003cb\u003eIntroduction:\u003c\/b\u003e\u003cbr\u003e- The 131F is a large-aperture telescope designed for astronomy enthusiasts, featuring a 131mm aperture, 983mm focal length, and a native F7.5 focal ratio.\u003cbr\u003e\u003cbr\u003e- It employs a quadruplet optical lens design with three elements in the front and one in the rear, including one piece of ED glass to effectively suppress chromatic aberration.\u003cbr\u003e\u003cbr\u003e- The lens tube incorporates an internal baffle to block stray light, further enhancing image quality. The 131F supports full-frame imaging and delivers excellent star performance across the frame.\u003cbr\u003e\u003cbr\u003e- Continuing the F series' self-flattening design, users can achieve optimal imaging without purchasing an additional flattener or calculating back focus. Simply connect the imaging accessory, achieve focus, and you're ready to shoot - streamlining the process and lowering the barrier to use.\u003cbr\u003e\u003cbr\u003e- The telescope comes standard with a photographic extension tube featuring a built-in 2-inch filter thread and offers M48x0.75 and M54x0.75 adapters for broad compatibility with DSLR cameras and dedicated astronomy cameras, meeting diverse imaging needs.\u003cbr\u003e\u003cbr\u003e- Staying true to the brand philosophy, the 131F balances optical performance with user experience. The lens tube is crafted with high-quality CNC machining and painted finish, continuing the F series' iconic blue-and-white color scheme for strong visual identity.\u003cbr\u003e\u003cbr\u003e- Whether for deep-sky imaging or visual observation, the 131F is an ideal choice for advancing your astrophotography journey.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Aperture size: 131mm\u003cbr\u003e- Focal length: 983mm\u003cbr\u003e- Focal ratio: f\/7.5\u003cbr\u003e- Objective lens: Quadruplet air-spaced APO (including one ED glass)\u003cbr\u003e- Image circle: 44mm\u003cbr\u003e- Maximum accessory connection (with the focuser fully retreated):\u003cbr\u003e  Imaging mode: 73mm (from the base of M48×0.75 male thread); 91mm (from the base of M54×0.75 male thread)\u003cbr\u003e  Observing mode: 131mm (from the end of 1.25\" eyepiece holder); 141mm (from the end of 2\" eyepiece holder)\u003cbr\u003e- Minimum accessory connection (with the focuser fully extended):\u003cbr\u003e  Imaging mode: 43mm (from the base of M48×0.75 male thread); 61mm (from the base of M54×0.75 male thread)\u003cbr\u003e  Observing mode: 101mm (from the end of 1.25\" eyepiece holder); 111mm (from the end of 2\" eyepiece holder)\u003cbr\u003e- Total length:\u003cbr\u003e  878mm (including 1.25\" adapter as dew shield contracted)\u003cbr\u003e  963mm (including 1.25\" adapter as dew shield fully stretched)\u003cbr\u003e  941mm (including the photographic adapter as dew shield contracted) \u003cbr\u003e  1026mm (including the photographic adapter as dew shield fully stretched)\u003cbr\u003e- Focuser travel length: 30mm\u003cbr\u003e- Net weight: 7.9kg\u003cbr\u003e- Gross weight (Including tube ring\u0026amp;dovetail plate): 9.4kg\u003cbr\u003e- Rear-end thread type:\u003cbr\u003e  M78×1-M54×0.75\u003cbr\u003e  M54×0.75-M54×0.75\u003cbr\u003e  M54×0.75-M48×0.75 (with M48×0.75 filter thread)\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x 131F OTA\u003cbr\u003e- 1 x Pair of Tube Rings\u003cbr\u003e- 1 x Handle\u003cbr\u003e- 1 x 300MM Losmandy Dovetail Plate\u003cbr\u003e- 1 x Set of Photographic Adapters\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-02.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-03.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-04.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-05.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-06.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-07.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-08.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-09.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-10.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-11.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102230\/102230-12.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products, Audio Amplifer and Decoders","offers":[{"title":"Default Title","offer_id":41029096964145,"sku":"102230","price":2221.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0578\/4790\/6353\/files\/1779325813-2.jpg?v=1780389502","url":"https:\/\/www.thanksbuyer.com\/de\/products\/askar-131f-131mm-large-aperture-f7-5-flat-field-astronomical-telescope-self-flattened-quadruplet-astrograph","provider":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products,  Audio Amplifer and Decoders","version":"1.0","type":"link"}