0.8x reducer for Askar 140 APO
The Askar 0.8x reducer is designed specifically for the Askar 140 APO astrograph, reducing the focal ratio and increasing the field of view. This model is equipped with a triplet optical system and incorporates a field flattening function, making this reducer particularly suitable for deep-sky astrophotography. Compatible with full-frame sensors, it allows image coverage of 44 mm without vignetting.
0.8x gearbox features
- Reduced focal ratio : By reducing the focal ratio from f/7 to f/5.6, this reducer improves brightness and enables shorter exposure times, increasing the ability to capture fine detail in celestial objects.
- Reduced focal length : The astrograph's focal length increases to 784 mm, which is ideal for wide-field shots, capturing nebulae and star clusters at high resolution.
- Lens design : Triplet system optimized for sharp images, with correction of chromatic aberrations and field curvature, guaranteeing well-defined stars right up to the edges.
- Back focus : Standard 55 mm back focal length, measured from M48 thread, compatible with many astrophotography accessories.
- Weight : 0.63 kg, offering perfect balance for astrophotography setups.
Additional dimensions and specifications
- Outside diameter : 96 mm, with M92*1 front thread, offering stable construction and maximum compatibility with the 140 APO astrograph.
- Rear thread : M48*0.75 with integrated 2" filter thread, making it easy to add filters to optimize shots.
- Adapters included : The reducer is supplied with M540.75 and M480.75 adapters, providing flexibility and ease of connection with different equipment configurations.
Benefits for users
This reducer reduces exposure time and increases the field of view, facilitating astrophotography of large celestial objects such as nebulae and star clusters. Compatibility with full-frame sensors and the possibility of adding 2" filters via the M48*0.75 thread make this a versatile and valuable accessory for astrophotographers seeking performance and flexibility.
Optional accessories for 140 APO
In addition to this 0.8x reducer, the 140 APO astrograph offers a 1.0x field flattener for users requiring field correction without focal length reduction, providing extensive instrument optimization options.
