Askar 140APO 0.8x Full Frame Reducer User Manual
- June 1, 2024
- Askar
Table of Contents
140APO 0.8x Full Frame Reducer
User’s Manual
DO NOT LOOK AT SUN THROUGH TELESCOPE.
IT WILL CAUSE IRREVERSIBLE DAMAGE TO YOUR EYE.
Instructions for use
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 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 44mm full-frame image circle. The overall weight is 0.63kg. The back focus from the M48 thread is a standard 55mm. The front thread is M921. At the camera end, it is equipped with M540.75 and M480.75 two sizes of adapters, which are convenient for connection. At the same time, it has a built-in M480.75 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.
- M92×1
- M54×0.75
- 2″filter thread
- M48×0.75
- focal plane
Parameters
(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)
Installation instruction
Unscrew the 2″ adapter and the 1.25″ adapter
Unscrew the dust cap of the accessory and screw it into the 140APO