Askar 131F f/7.5 Flat-Field Quadruplet Refractor Telescope
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- 131 mm quadruplet APO with ED glass delivers sharp, high-contrast images with color correction for astrophotography and visual observing
- Built-in self-flattened optics support full-frame imaging with no additional flattener or complicated back-focus required
- 3-inch dual-speed rack-and-pinion focuser with 360° rotator makes framing and focus effortless
- Retractable dew shield, multiple finder mounting locations, and portable CNC-machined design make it ideal for travel imaging and flexible accessory setups
- An optional dedicated 0.74x Reducer for 131F is available and sold separately for extra imaging versatility
Askar 131F Overview: Specs, Example Images, & Included Items
Askar 131F Self-Flattened Quadruplet Astrograph!
Staying true to Askar’s user-friendly design philosophy, the Askar 131F is built to deliver premium performance while remaining practical and easy to use. Featuring a 131 mm aperture, 983 mm focal length, and a versatile native focal ratio of f/7.5, the 131F is well suited for astrophotography, visual astronomy, and even daytime photography applications.
The telescope uses a high-performance quadruplet optical design with three elements in the front and one in the rear, including an ED glass element to help reduce chromatic aberration and produce sharp, color-corrected images with excellent contrast. The retractable dew shield helps shorten the telescope for easier storage and transport, making it more convenient for travel and field use! Built with a durable CNC-machined aluminum tube and high-quality painted finish, the 131F combines a solid premium feel with Askar’s signature blue-and-white F-series styling for a clean, modern appearance under the night sky.
Features that Stand Out
Flexible Camera Connection
The Askar 131F comes standard with a photographic extension tube, which is designed with a 2-inch filter thread. It includes adapters with M48x0.75 and M54x0.75 specifications, ensuring compatibility with DSLR cameras or astronomy cameras to meet diverse needs.
Built-in Flat-Field
Thanks to its built-in self-flattened design, the Askar 131F is ready for imaging right out of the box! Simply connect your camera, reach focus, and start capturing the night sky, no additional field flattener or back-focus calculations required. This design makes setup faster, easier, and far more beginner-friendly while still delivering sharp stars and excellent image quality across the field.
Brighter Images, Faster
Thanks to its built-in self-flattened design, the Askar 131F is ready for imaging right out of the box. Simply connect your camera and accessories, reach focus, and start capturing the night sky, no additional field flattener or back-focus calculations required. This design makes setup faster, easier, and far more beginner-friendly while still delivering sharp stars and excellent image quality across the field.
Askar 131F in Action: The Dumbbell Nebula
Image credit: Nazmus Nasir
NGC7293 - 张宇航
Gyulbudaghian's Nebula - Nico Carver
NGC7293 - 张宇航
Built for Streamlined Sessions
The Askar 131F is equipped with a sturdy 3-inch dual-speed rack-and-pinion focuser with 1:10 fine adjustment, making it easy to achieve precise focus for both visual observing and astrophotography. The fine-focus knob also features a protective cap to help prevent accidental damage during transport or setup. For added convenience, the rear of the focuser includes a fully rotatable 360° graduated camera rotator, allowing you to easily frame and adjust your imaging setup with precision.
The telescope also includes a durable 300 mm Losmandy-style dovetail plate with built-in 1/4-inch and 3/8-inch threaded mounting holes, making it simple to attach directly to compatible mounts or tripods for quick setup in the field.
All-in-one Imaging Package
The Askar 111F is designed with flexibility and convenience in mind, featuring multiple built-in finder mounting locations for easier accessory setup and customization. The carry handle includes an integrated finder shoe, while additional finder bases on both sides of the focuser allow you to reposition a finder scope, guide scope, or other accessories without needing to disassemble your setup. This thoughtful design makes it easier to configure the telescope for astrophotography, guiding, or visual observing while keeping accessories within easy reach.
Askar 131F Breakdown
Specifications
- Aperture size: 131mm
- Focal length: 983 mm
- Focal ratio: f/7.5
- Objective lens: Quadruplet air-spaced APO (including one ED glass)
- Image circle: 44 mm
Maximum accessory connection (with the focuser fully retreated)
- Imaging mode:
- 73 mm - 2.9 in (from the base of M48×0.75 male thread）
- 91 mm - 3.6 in (from the base of M54×0.75 male thread)
- Observing mode:
- 131 mm - 5.2 in (from the end of 1.25" eyepiece holder）
- 141 mm - 5.6 in from the end of 2" eyepiece holder)
Minimum accessory connection (with the focuser fully extended)
- Imaging mode:
- 43 mm - 1.7 in (from the base of M48×0.75 male thread）
- 61 mm - 2.4 in (from the base of M54×0.75 male thread)
- Observing mode:
- 102 mm - 4.0 in (from the end of 1.25" eyepiece holder）
- 112 mm - 4.4 in from the end of 2" eyepiece holder)
- Total length
- 878 mm - 34.56 in (including 1.25" adapter as dew shield contracted）
- 963 mm - 37.9 in (including 1.25" adapter as dew shield fully stretched）
- 941 mm - 37.0 in (including the photographic adapter as dew shield contracted）
- 1026 mm - 40.4 in (including the photographic adapter as dew shield fully stretched）
- Focuser travel length: 30 mm
- Net weight: 17.4 lb (7.9 kg)
- Gross weight (Including tube ring&dovetail plate): 20.7 lb (9.4 kg)
- Rear-end thread type:
- M78x1-M54x0.75
- M54x0.75-M54x0.75
- M54x0.75-M48x0.75 (w/ M48x0.75 filter thread)
Askar 131F Diagrams
Mechanical Diagram
Connection Diagram
The Locking Screw Position Diagram
Electronic Focuser Assembly Diagram
Optical Path Diagram
Spot Diagram
Other Information
- Country of Manufacture: China
Askar 131F Overview: Specs, Example Images, & Included Items
Askar 131F Self-Flattened Quadruplet Astrograph!
Staying true to Askar’s user-friendly design philosophy, the Askar 131F is built to deliver premium performance while remaining practical and easy to use. Featuring a 131 mm aperture, 983 mm focal length, and a versatile native focal ratio of f/7.5, the 131F is well suited for astrophotography, visual astronomy, and even daytime photography applications.
The telescope uses a high-performance quadruplet optical design with three elements in the front and one in the rear, including an ED glass element to help reduce chromatic aberration and produce sharp, color-corrected images with excellent contrast. The retractable dew shield helps shorten the telescope for easier storage and transport, making it more convenient for travel and field use! Built with a durable CNC-machined aluminum tube and high-quality painted finish, the 131F combines a solid premium feel with Askar’s signature blue-and-white F-series styling for a clean, modern appearance under the night sky.
Features that Stand Out
Flexible Camera Connection
The Askar 131F comes standard with a photographic extension tube, which is designed with a 2-inch filter thread. It includes adapters with M48x0.75 and M54x0.75 specifications, ensuring compatibility with DSLR cameras or astronomy cameras to meet diverse needs.
Built-in Flat-Field
Thanks to its built-in self-flattened design, the Askar 131F is ready for imaging right out of the box! Simply connect your camera, reach focus, and start capturing the night sky, no additional field flattener or back-focus calculations required. This design makes setup faster, easier, and far more beginner-friendly while still delivering sharp stars and excellent image quality across the field.
Brighter Images, Faster
Thanks to its built-in self-flattened design, the Askar 131F is ready for imaging right out of the box. Simply connect your camera and accessories, reach focus, and start capturing the night sky, no additional field flattener or back-focus calculations required. This design makes setup faster, easier, and far more beginner-friendly while still delivering sharp stars and excellent image quality across the field.
Askar 131F in Action: The Dumbbell Nebula
Image credit: Nazmus Nasir
NGC7293 - 张宇航
Gyulbudaghian's Nebula - Nico Carver
NGC7293 - 张宇航
Built for Streamlined Sessions
The Askar 131F is equipped with a sturdy 3-inch dual-speed rack-and-pinion focuser with 1:10 fine adjustment, making it easy to achieve precise focus for both visual observing and astrophotography. The fine-focus knob also features a protective cap to help prevent accidental damage during transport or setup. For added convenience, the rear of the focuser includes a fully rotatable 360° graduated camera rotator, allowing you to easily frame and adjust your imaging setup with precision.
The telescope also includes a durable 300 mm Losmandy-style dovetail plate with built-in 1/4-inch and 3/8-inch threaded mounting holes, making it simple to attach directly to compatible mounts or tripods for quick setup in the field.All-in-one Imaging Package
The Askar 111F is designed with flexibility and convenience in mind, featuring multiple built-in finder mounting locations for easier accessory setup and customization. The carry handle includes an integrated finder shoe, while additional finder bases on both sides of the focuser allow you to reposition a finder scope, guide scope, or other accessories without needing to disassemble your setup. This thoughtful design makes it easier to configure the telescope for astrophotography, guiding, or visual observing while keeping accessories within easy reach.
Askar 131F Breakdown
Specifications
- Aperture size: 131mm
- Focal length: 983 mm
- Focal ratio: f/7.5
- Objective lens: Quadruplet air-spaced APO (including one ED glass)
- Image circle: 44 mm
Maximum accessory connection (with the focuser fully retreated)
- Imaging mode:
- 73 mm - 2.9 in (from the base of M48×0.75 male thread）
- 91 mm - 3.6 in (from the base of M54×0.75 male thread)
- Observing mode:
- 131 mm - 5.2 in (from the end of 1.25" eyepiece holder）
- 141 mm - 5.6 in from the end of 2" eyepiece holder)
Minimum accessory connection (with the focuser fully extended)
- Imaging mode:
- 43 mm - 1.7 in (from the base of M48×0.75 male thread）
- 61 mm - 2.4 in (from the base of M54×0.75 male thread)
- Observing mode:
- 102 mm - 4.0 in (from the end of 1.25" eyepiece holder）
- 112 mm - 4.4 in from the end of 2" eyepiece holder)
- Total length
- 878 mm - 34.56 in (including 1.25" adapter as dew shield contracted）
- 963 mm - 37.9 in (including 1.25" adapter as dew shield fully stretched）
- 941 mm - 37.0 in (including the photographic adapter as dew shield contracted）
- 1026 mm - 40.4 in (including the photographic adapter as dew shield fully stretched）
- Focuser travel length: 30 mm
- Net weight: 17.4 lb (7.9 kg)
- Gross weight (Including tube ring&dovetail plate): 20.7 lb (9.4 kg)
- Rear-end thread type:
- M78x1-M54x0.75
- M54x0.75-M54x0.75
- M54x0.75-M48x0.75 (w/ M48x0.75 filter thread)
Askar 131F Diagrams
Mechanical Diagram
Connection Diagram
The Locking Screw Position Diagram
Electronic Focuser Assembly Diagram
Optical Path Diagram
Spot Diagram
| Manufacturer | Askar |
|---|---|
| Telescope Focal Length | 901 - 1000mm |
- 1x 131F quadruplet refractor
- 1x Tube rings (set of 2)
- 1x Handle
- 1x 300mm Losmandy dovetail plate
- 1x M78-M54 & M54-M48 photographic adapters
- 1x Inspection check list
- 1x User manual
- 1x Certificate card
- 1x Product warranty
- 131 mm quadruplet APO with ED glass delivers sharp, high-contrast images with color correction for astrophotography and visual observing
- Built-in self-flattened optics support full-frame imaging with no additional flattener or complicated back-focus required
- 3-inch dual-speed rack-and-pinion focuser with 360° rotator makes framing and focus effortless
- Retractable dew shield, multiple finder mounting locations, and portable CNC-machined design make it ideal for travel imaging and flexible accessory setups
- An optional dedicated 0.74x Reducer for 131F is available and sold separately for extra imaging versatility
Askar 131F Overview: Specs, Example Images, & Included Items
Askar 131F Self-Flattened Quadruplet Astrograph!
Staying true to Askar’s user-friendly design philosophy, the Askar 131F is built to deliver premium performance while remaining practical and easy to use. Featuring a 131 mm aperture, 983 mm focal length, and a versatile native focal ratio of f/7.5, the 131F is well suited for astrophotography, visual astronomy, and even daytime photography applications.
The telescope uses a high-performance quadruplet optical design with three elements in the front and one in the rear, including an ED glass element to help reduce chromatic aberration and produce sharp, color-corrected images with excellent contrast. The retractable dew shield helps shorten the telescope for easier storage and transport, making it more convenient for travel and field use! Built with a durable CNC-machined aluminum tube and high-quality painted finish, the 131F combines a solid premium feel with Askar’s signature blue-and-white F-series styling for a clean, modern appearance under the night sky.
Features that Stand Out
Flexible Camera Connection
The Askar 131F comes standard with a photographic extension tube, which is designed with a 2-inch filter thread. It includes adapters with M48x0.75 and M54x0.75 specifications, ensuring compatibility with DSLR cameras or astronomy cameras to meet diverse needs.
Built-in Flat-Field
Thanks to its built-in self-flattened design, the Askar 131F is ready for imaging right out of the box! Simply connect your camera, reach focus, and start capturing the night sky, no additional field flattener or back-focus calculations required. This design makes setup faster, easier, and far more beginner-friendly while still delivering sharp stars and excellent image quality across the field.
Brighter Images, Faster
Thanks to its built-in self-flattened design, the Askar 131F is ready for imaging right out of the box. Simply connect your camera and accessories, reach focus, and start capturing the night sky, no additional field flattener or back-focus calculations required. This design makes setup faster, easier, and far more beginner-friendly while still delivering sharp stars and excellent image quality across the field.
Askar 131F in Action: The Dumbbell Nebula
Image credit: Nazmus Nasir
NGC7293 - 张宇航
Gyulbudaghian's Nebula - Nico Carver
NGC7293 - 张宇航
Built for Streamlined Sessions
The Askar 131F is equipped with a sturdy 3-inch dual-speed rack-and-pinion focuser with 1:10 fine adjustment, making it easy to achieve precise focus for both visual observing and astrophotography. The fine-focus knob also features a protective cap to help prevent accidental damage during transport or setup. For added convenience, the rear of the focuser includes a fully rotatable 360° graduated camera rotator, allowing you to easily frame and adjust your imaging setup with precision.
The telescope also includes a durable 300 mm Losmandy-style dovetail plate with built-in 1/4-inch and 3/8-inch threaded mounting holes, making it simple to attach directly to compatible mounts or tripods for quick setup in the field.All-in-one Imaging Package
The Askar 111F is designed with flexibility and convenience in mind, featuring multiple built-in finder mounting locations for easier accessory setup and customization. The carry handle includes an integrated finder shoe, while additional finder bases on both sides of the focuser allow you to reposition a finder scope, guide scope, or other accessories without needing to disassemble your setup. This thoughtful design makes it easier to configure the telescope for astrophotography, guiding, or visual observing while keeping accessories within easy reach.
Askar 131F Breakdown
Specifications
- Aperture size: 131mm
- Focal length: 983 mm
- Focal ratio: f/7.5
- Objective lens: Quadruplet air-spaced APO (including one ED glass)
- Image circle: 44 mm
Maximum accessory connection (with the focuser fully retreated)
- Imaging mode:
- 73 mm - 2.9 in (from the base of M48×0.75 male thread）
- 91 mm - 3.6 in (from the base of M54×0.75 male thread)
- Observing mode:
- 131 mm - 5.2 in (from the end of 1.25" eyepiece holder）
- 141 mm - 5.6 in from the end of 2" eyepiece holder)
Minimum accessory connection (with the focuser fully extended)
- Imaging mode:
- 43 mm - 1.7 in (from the base of M48×0.75 male thread）
- 61 mm - 2.4 in (from the base of M54×0.75 male thread)
- Observing mode:
- 102 mm - 4.0 in (from the end of 1.25" eyepiece holder）
- 112 mm - 4.4 in from the end of 2" eyepiece holder)
- Total length
- 878 mm - 34.56 in (including 1.25" adapter as dew shield contracted）
- 963 mm - 37.9 in (including 1.25" adapter as dew shield fully stretched）
- 941 mm - 37.0 in (including the photographic adapter as dew shield contracted）
- 1026 mm - 40.4 in (including the photographic adapter as dew shield fully stretched）
- Focuser travel length: 30 mm
- Net weight: 17.4 lb (7.9 kg)
- Gross weight (Including tube ring&dovetail plate): 20.7 lb (9.4 kg)
- Rear-end thread type:
- M78x1-M54x0.75
- M54x0.75-M54x0.75
- M54x0.75-M48x0.75 (w/ M48x0.75 filter thread)
Askar 131F Diagrams
Mechanical Diagram
Connection Diagram
The Locking Screw Position Diagram
Electronic Focuser Assembly Diagram
Optical Path Diagram
Spot Diagram
Other Information
- Country of Manufacture: China
| Manufacturer | Askar |
|---|---|
| Telescope Focal Length | 901 - 1000mm |
- 1x 131F quadruplet refractor
- 1x Tube rings (set of 2)
- 1x Handle
- 1x 300mm Losmandy dovetail plate
- 1x M78-M54 & M54-M48 photographic adapters
- 1x Inspection check list
- 1x User manual
- 1x Certificate card
- 1x Product warranty
Askar 131F f/7.5 Flat-Field Quadruplet Refractor Telescope