Askar 131F Flat Field Refractor
Over view
Package content
- Askar 131F Flat-Field Refractor OTA
- Tube Rings
- Handle
- 11.8″ Dovetail Plate
- Set of Photographic Adapters
Description
- Large refractor aperture and photo-ready optics come together in this offering! Pushing Askar’s F-Series even further, this telescope brings you big 5″ refractive optics and the series’ signature internally corrected images and great performance. Reach out with ease and realize more resolving power, with the Askar 131F Flat-Field Refractor!|
- Large optics, internal field-flattening, and smart design come together for an astrophotography option that makes reaching for more easy. The Askar 131F Flat-Field Refractor has a 131 mm aperture with an f/7.5 focal ratio, for a 983 mm focal length. This longer reach makes for a great platform for honing in on medium to smaller targets, or capturing features of larger ones in more detail.
- This features a quadruplet optical design, containing one ED element, which internally flattens the images through this telescope for superb results without additional correctors or meticulous backspacing. Ensuring you can confidently bring these views to even the stoutest imaging trains, the telescope comes equipped with a large 3″ rack & pinion dual-speed focuser, which additionally is designed to easily accommodate common electronic filters for modern convenience and precision.
- This stellar optical train is supported with visual & imaging filters packed in the box and three Synta-style mount points for accessories, for a fantastic 5″ astrophotography refractor value!
Specification
|
SKU Number
|
ASK-131F |
|---|---|
|
Model Number
|
131F |
|
Telescope Series
|
Askar F |
|
Focal Ratio
|
f/7.5 |
|
Optical Design
|
Refractor |
|
Telescope Aperture
|
131mm (5.15″) |
|
Telescope Mount Type
|
No Mount – OTA Only |
|
Type of Electronics
|
OTA Only – No Electronics |
|
Number of Refractor Elements
|
4 (Quad) |
|
Focal Length (mm)
|
983mm |
|
Image Circle
|
44mm |
|
Focuser Style
|
Rack & Pinion |
|
Focuser Size
|
3″ |
|
Focuser Speed
|
Dual Speed |
|
Refractor Dew Shield Diameter (in.)
|
6.4″ |
|
Telescope OTA Weight (lb.)
|
20.7 lb. |
|
Refractor OTA Length – Extended (in.)
|
34.6″ (1.25″ Visual Adapter) | 37.9″ (Imaging Adapters) |
|
Refractor OTA Length – Retracted (in.)
|
37.0″ (1.25″ Visual Adapter) | 40.4″ (Imaging Adapters) |
|
Warranty
|
Askar – 1 Year |
Function
Usage instruction
Documents / Resources
 | 131F Flat Field Refractor |
References
- User Manualmanual.tools
Published: June 13, 2026