Askar 1.0× Flattener for 140APO

Askar 140APO 1.0× Flattener

This 1× flattener is designed specifically for the Askar 140APO. Its triplet design corrects the photographic field across a 44 mm full-frame image circle. With the matched telescope, Askar publishes 980mm focal length and f/7.

Optical configuration

The 1× design retains the telescope’s native focal length and focal ratio while correcting field curvature and coma towards the edge of the image.

Connections and filters

The telescope-side connection is M92×1. Supplied camera-side interfaces are M68×1, M54×0.75 and M48×0.75. An internal M48×0.75 thread accepts a 2-inch filter.

Sensor spacing

Set 55 mm from the base of the M48 male thread to the sensor. This reference applies to the stated M48 camera arrangement; changing the adapter changes the reference face. Include all intervening adapters and optical components when arranging the train.

Construction and storage

The CNC-machined housing has threaded metal caps at both ends for dust protection during storage. The manufacturer technical table lists a weight of 0.79kg. Telescope, camera and filters are separate equipment.

Askar manufacturer documentation

Compatibility notes

Only the matched Askar 140APO configuration is verified. 55 mm backfocus is measured from the M48 male thread base. Manufacturer table weight is 0.79 kg; introduction says 0.75 kg. The technical table value is used.