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Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
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30 Day Return Policy
Buy with confidence knowing that we accept returns up to 30 days after purchase. We want you to have something you will actually use and we are confident that we keep good quality products in our store with No Junk.
Price Match Promise
Shipping around for the best price is tough, we make it easier by offering the best pricing in the market. But if you find a better price on an in-store item somewhere else we will match it!
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Product Description
The Askar 131F is a large-aperture telescope designed for astronomy enthusiasts, featuring a 131mm aperture, 983mm focal length, and a native F7.5 focal ratio.
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.
The lens tube incorporates an internal baffle to block stray light, further enhancing image quality. The Askar 131F supports full-frame imaging and delivers excellent star performance across the frame.
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.
The telescope comes standard with a photographic extension tube featuring a built-in 2-inch filter thread and offers M48×0.75 and M54×0.75 adapters for broad compatibility with DSLR cameras and dedicated astronomy cameras, meeting diverse imaging needs.
Staying true to the brand philosophy, the Askar 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.
Whether for deep-sky imaging or visual observation, the Askar 131F is an ideal choice for advancing your astrophotography journey.
Specifications
| Parameters | ||
| Aperture size | 131mm | |
| Focal length | 983mm | |
| Focal ratio | f/7.5 | |
| Objective lens | Quadruplet air-spaced APO(including one ED glass) | |
| Image circle | 44mm | |
| Maximum accessory connection (with the focuser fully retreated) |
Imaging mode: 73mm (from the base of M48×0.75 male thread） 91mm（from the base of M54×0.75 male thread) |
Observing mode: 131mm（from the end of 1.25" eyepiece holder） 141mm（from the end of 2" eyepiece holder） |
| Minimum accessory connection (with the focuser fully extended) |
Imaging mode: 43mm (from the base of M48×0.75 male thread） 61mm（from the base of M54×0.75 male thread) |
Observing mode: 101mm（from the end of 1.25" eyepiece holder） 111mm（from the end of 2" eyepiece holder） |
| Total length |
878mm(including 1.25" adapter as dew shield contracted） 963mm(including 1.25" adapter as dew shield fully stretched） 941mm(including the photographic adapter as dew shield contracted） 1026mm(including the photographic adapter as dew shield fully stretched） |
|
| Focuser travel length | 30mm | |
| Net weight | 7.9kg | |
| Gross weight (Including tube ring&dovetail plate) | 9.4kg | |
| Rear-end thread type |
M78×1-M54×0.75 M54×0.75-M54×0.75 M54×0.75-M48×0.75 (with M48×0.75 filter thread) |
|
| Standard package items | A 131F OTA，a pair of tube rings, a handle, a 300mm Losmandy dovetail plate,a set of photographic adapters | |
Product Size Diagram
Connection Diagram
The Locking Screw Position Diagram
Electronic Focuser Assembly Diagram
Optical Path Diagram
Spot Diagram
What can I see with a Askar 131F Flat-Field Quadruplet Astrograph | ASKAR-131F?
Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.
Jupiter with
25mm Eyepiece - 39x Magnification
(Sold Separately)
Jupiter with
10mm Eyepiece - 98x Magnification
Sold Separately
Jupiter with
5mm Eyepiece - 197x Magnification
Sold Separately
Moon with 25mm Eyepiece
39x Magnification
(Sold Separately)
Moon with 10mm Eyepiece
98x Magnification
Sold Separately
Moon with 5mm Eyepiece
197x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
27x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
39x Magnification
(Sold Separately)
Andromeda with 10mm Eyepiece
98x Magnification
Sold Separately
