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The 0.8x reducer can bring Askar 140APO's focal ratio down to F5.6. This is a standard reducer with field flattening capabilities as well. A shorter focal ratio allows the OTA to have a ld 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 44mm full-frame image circle. The overall weight is 0.75kg. The back focus from the M48 thread is a standard 55mm. The front thread is M92*1. At the camera end, it is equipped with M54*0.75 and M48*0.75 two sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48*0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.
| Specification | Details |
|---|---|
| After attaching 140APO Focal length | 784mm |
| After attaching 140APO Focal ratio | f/5.6 |
| Lens Number | Triplet design |
| Back Focus | 55mm (from the base of M48 male thread) |
| Weight | 0.63kg |
| Rear-end thread type | M54×0.75, M54×0.75-M48×0.75 (M48×0.75 filter thread inside) |
Spot Diagram
