Reducer 0.75x 71F

Askar 71F 0.75x Gearbox – Specifications and Features

The Askar 71F 0.75x reducer is a high-quality accessory optimized for the Askar 71F telescope, offering new possibilities for use. This reducer is designed to reduce the focal ratio and flatten the field, making it ideal for capturing large areas of nebulae, star clusters and fast-moving celestial objects. It offers the following technical features:

• Focal length : 369 mm after installation with 71F
• Focal report : f/5.2 after installation with the 71F
• Lens type : Triplet design for improved optical correction
• Rear focal length : 55 mm (measured from base of M48 male thread)
• Weight : 0.23 kg, ensuring optimum balance for astrophotography setups
• Rear thread type : M59*1, facilitating integration with various accessories

This reducer's design maintains an image circle compatible with 44mm full-frame sensors, guaranteeing full image coverage and sharp stars right up to the edges. What's more, it includes two adapters: one in M540.75 and the other in M480.75, for enhanced compatibility with existing configurations.

Dimensions and construction

• Outside diameter : 62 mm
• Total length : 48 mm
• Thread : M59*1, for a reliable and secure connection

Finally, both ends feature CNC-machined, threaded metal caps to protect against dust and dirt when the equipment is not in use, ensuring long life and optimum performance in demanding environments.

Benefits for users

By reducing the focal ratio, this reducer enables shorter exposure times, widening the field of view for faster captures and improved visual effect when observing diffuse celestial objects. It is particularly suited to astrophotographers seeking to maximize the quality and width of their field of observation.