Askar 0.74x Reducer for Askar 131F & ZWO FF131 Apo Telescopes
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- Dedicated 0.74x reducer turns the Askar 131F refractor into a faster wide-field astrograph for deep-sky imaging.
- Full-frame optimized design maintains sharp stars and excellent edge-to-edge correction.
- Faster focal ratio allows shorter exposures and brighter astrophotography results.
- Precision-matched for the Askar 131F to maintain excellent optical performance and alignment.
Askar 0.74x Reducer: Unlock a more Efficient Astrophotography Experience!
Unlock the full wide-field imaging potential of your Askar 131F with the dedicated 0.74x Reducer. Designed specifically for the 131F optical system, this premium reducer transforms the telescope into a fast f/5.6 astrograph—ideal for capturing expansive nebulae, large galaxies, rich star fields, and faint deep-sky targets with shorter exposure times and brighter overall results.
Its advanced triplet optical design features built-in field-flattening correction to reduce field curvature and maintain sharp, well-corrected stars across the entire image frame. Supporting a large full-frame image circle, the reducer delivers excellent edge-to-edge performance for modern astrophotography cameras and high-resolution imaging setups.
Built for both performance and convenience, the reducer features a standard 55 mm back focus along with secure threaded connections for improved rigidity and stable camera alignment during long imaging sessions. Included adapters allow for quick, direct connection to the 131F optical tube assembly, while the integrated 2-inch filter thread makes it easy to install a wide range of astronomical filters without needing additional accessories.
Specifications
- Compatibility: Askar 131F refractor
- Effective Focal length: 733.6 mm
- Effective Focal ratio: f/5.6
- Lens Number: Triplet design
- Back Focus: 55mm (base of M48 male thread）
- Weight: 0.56 kg (1.2 lb)
- Rear-end thread type: M72x1
- Filter threading: M48x0.75
- Image circle: 44 mm (Full frame)
- Assembly: CNC-machined
Size Diagram
Installation Diagram
Optical Path Diagram
Spot Diagram
Other Information
- Country of Manufacture: China
Askar 0.74x Reducer: Unlock a more Efficient Astrophotography Experience!
Unlock the full wide-field imaging potential of your Askar 131F with the dedicated 0.74x Reducer. Designed specifically for the 131F optical system, this premium reducer transforms the telescope into a fast f/5.6 astrograph—ideal for capturing expansive nebulae, large galaxies, rich star fields, and faint deep-sky targets with shorter exposure times and brighter overall results.
Its advanced triplet optical design features built-in field-flattening correction to reduce field curvature and maintain sharp, well-corrected stars across the entire image frame. Supporting a large full-frame image circle, the reducer delivers excellent edge-to-edge performance for modern astrophotography cameras and high-resolution imaging setups.
Built for both performance and convenience, the reducer features a standard 55 mm back focus along with secure threaded connections for improved rigidity and stable camera alignment during long imaging sessions. Included adapters allow for quick, direct connection to the 131F optical tube assembly, while the integrated 2-inch filter thread makes it easy to install a wide range of astronomical filters without needing additional accessories.
Specifications
- Compatibility: Askar 131F refractor
- Effective Focal length: 733.6 mm
- Effective Focal ratio: f/5.6
- Lens Number: Triplet design
- Back Focus: 55mm (base of M48 male thread）
- Weight: 0.56 kg (1.2 lb)
- Rear-end thread type: M72x1
- Filter threading: M48x0.75
- Image circle: 44 mm (Full frame)
- Assembly: CNC-machined
Size Diagram
Installation Diagram
Optical Path Diagram
Spot Diagram
- 1x 0.74x reducer for 131F refractor
- 2x Threaded protective metal caps
- Dedicated 0.74x reducer turns the Askar 131F refractor into a faster wide-field astrograph for deep-sky imaging.
- Full-frame optimized design maintains sharp stars and excellent edge-to-edge correction.
- Faster focal ratio allows shorter exposures and brighter astrophotography results.
- Precision-matched for the Askar 131F to maintain excellent optical performance and alignment.
Askar 0.74x Reducer: Unlock a more Efficient Astrophotography Experience!
Unlock the full wide-field imaging potential of your Askar 131F with the dedicated 0.74x Reducer. Designed specifically for the 131F optical system, this premium reducer transforms the telescope into a fast f/5.6 astrograph—ideal for capturing expansive nebulae, large galaxies, rich star fields, and faint deep-sky targets with shorter exposure times and brighter overall results.
Its advanced triplet optical design features built-in field-flattening correction to reduce field curvature and maintain sharp, well-corrected stars across the entire image frame. Supporting a large full-frame image circle, the reducer delivers excellent edge-to-edge performance for modern astrophotography cameras and high-resolution imaging setups.
Built for both performance and convenience, the reducer features a standard 55 mm back focus along with secure threaded connections for improved rigidity and stable camera alignment during long imaging sessions. Included adapters allow for quick, direct connection to the 131F optical tube assembly, while the integrated 2-inch filter thread makes it easy to install a wide range of astronomical filters without needing additional accessories.
Specifications
- Compatibility: Askar 131F refractor
- Effective Focal length: 733.6 mm
- Effective Focal ratio: f/5.6
- Lens Number: Triplet design
- Back Focus: 55mm (base of M48 male thread）
- Weight: 0.56 kg (1.2 lb)
- Rear-end thread type: M72x1
- Filter threading: M48x0.75
- Image circle: 44 mm (Full frame)
- Assembly: CNC-machined
Size Diagram
Installation Diagram
Optical Path Diagram
Spot Diagram
Other Information
- Country of Manufacture: China
- 1x 0.74x reducer for 131F refractor
- 2x Threaded protective metal caps
Askar 0.74x Reducer for Askar 131F & ZWO FF131 Apo Telescopes