Askar 0.6x reducer for 103 APO - Specifications and features
The Askar 0.6x reducer is a high-end accessory specially designed for the Askar 103 APO astrograph. In addition to reducing the focal ratio, this reducer incorporates a field flattener for optimum image quality right up to the edges. It is perfectly compatible with full-frame sensors, offering full image coverage of 44 mm without vignetting.
0.6x gearbox features
- Focal ratio reduction : This reducer reduces the focal ratio of the Askar 103 APO astrograph to f/4, enabling brighter images and shorter exposure times for astrophotography.
- Reduced focal length : The focal length is reduced to 420.24 mm, offering a wider field of view for capturing large-scale celestial objects at high resolution.
- Lens design : Quadriplet optics for aberration correction and uniform sharpness across the entire field, particularly beneficial for large sensors.
- Back focus : Standard 55 mm rear focal length, for easy integration with accessories and astrophotography cameras.
- Weight : 0.98 kg, ensuring optimum stability and balance for astrophotography setups.
Dimensions and technical design
- Outside diameter : 72 mm, with M84*1 front thread for secure attachment to the 103 APO astrograph.
- Rear thread : M48*0.75, with integrated thread for 2" filters, allowing direct installation of filters for customized observations.
- Adapters included : This reducer is supplied with M681, M540.75 and M48*0.75 adapters, offering maximum flexibility for connection to a variety of equipment.
Benefits for users
This reducer is designed to improve the efficiency of deep-sky shots by reducing the exposure time required while increasing the field of view. Full-frame compatibility lets you take advantage of the full potential of large sensors without compromising image quality. The addition of a 2" filter thread via the M48*0.75 adapter makes this reducer even more versatile for experienced astrophotographers.
Optional accessories for 103 APO
In addition to this 0.6x reducer, the 103 APO astrograph also offers a 1.0x flattener and a 0.8x reducer, providing different configuration options for users.
Installation steps for 0.6x gearbox on Askar 103 APO
- Tube and focuser positioning :
- First stretch the front tube sun visor.
- Adjust the tube retaining ring to the position shown in the image, ensuring that the end of the dovetail plate extends beyond the optical tube.
- Position the focuser beyond the dovetail, then lock the tube ring screw to stabilize the assembly.
- Removing the focuser :
- Unscrew the focuser by turning it in the direction indicated until it detaches from the telescope's main tube.
- Tube ring adjustment :
- Extend the retaining ring tube to create space for the gearbox.
- Make sure the dovetail protrudes beyond the tube to ensure optimum balance when using the reducer.
- Removing the rear section of the tube :
- Unscrew the rear section of the tube to access the part where the reducer will be mounted.
- Preparing the gearbox assembly :
- After screwing on the focuser, remove the rear section of the tube to make room for the reducer.
- Removing the 2" and 1.25" adapter :
- As shown, unscrew the 2" and 1.25" adapters to free up space for the reducer.
- Gearbox installation :
- Unscrew dust caps from accessories.
- Screw the reducer directly into tube 103 APO.
