Reducer 0.6x APO103

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

1. 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.
2. Removing the focuser :
   - Unscrew the focuser by turning it in the direction indicated until it detaches from the telescope's main tube.
3. 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.
4. Removing the rear section of the tube :
   - Unscrew the rear section of the tube to access the part where the reducer will be mounted.
5. Preparing the gearbox assembly :
   - After screwing on the focuser, remove the rear section of the tube to make room for the reducer.
6. Removing the 2" and 1.25" adapter :
   - As shown, unscrew the 2" and 1.25" adapters to free up space for the reducer.
7. Gearbox installation :
   - Unscrew dust caps from accessories.
   - Screw the reducer directly into tube 103 APO.