Askar 0.8x focal reducer for 103APO refractor

Askar 0.8x focal reducer for the Askar 103APO refractor

The 0.8x reducer can bring Askar 103APO's focal ratio down to F5.44. This is a standard reducer with field flattening capabilities as well. A shorter focal ratio allows the OTA to have a wider field of view and faster exposure times, making it suitable for capturing large areas of nebulae, star clusters, and faint, fast-moving celestial objects.

The 0.8x reducer adopts a triplet design and supports a 44 mm full-frame image circle. The overall weight is 0.48 Kg. The back focus from the M48 thread is a standard 55 mm. The front thread is M84x1. At the camera end, it is equipped with M54x0.75 and M48x0.75 two sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48x0.75 2" filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.

Installation instructions

Spot diagram