Askar 131F The Askar 131F is a 131mm aperture refractor with a 983mm focal length at f/7.5. Its air-spaced quadruplet uses a front triplet and rear correcting element, including one ED element. The integrated optical design supports a 44 mm full-frame image circle.
Manufacturer model: Askar 131F · Specifications checked against manufacturer data on 2026-11-04
The Askar 131F is a 131mm aperture refractor with a 983mm focal length at f/7.5. Its air-spaced quadruplet uses a front triplet and rear correcting element, including one ED element. The integrated optical design supports a 44 mm full-frame image circle.
Field correction is built into the telescope, so native photography does not need a separate flattener or a single mandatory flattener spacing. Attach the camera within the connection limits and focus. The table gives maximum and minimum connection distances for each rear adapter and focuser position. The 2-inch and 1.25-inch visual interfaces also accommodate observing accessories.
The 3-inch rack-and-pinion focuser provides coarse and 1:10 fine adjustment, plus a graduated 360° rotator. The photographic extension assembly offers M54×0.75 and M48×0.75 connections and an internal 2-inch filter thread.
Two finder bases and a finder-base slot in the handle provide accessory positions. The telescope includes tube rings and a 300 mm Losmandy-style dovetail plate. Its retractable dew shield shortens the transport configuration. Lengths and weights below distinguish the visual and photographic arrangements and the bare OTA from mounting hardware.
Askar manufacturer documentation
Exact named-model manufacturer specification table and operating information checked. Unpublished values are not inferred.
| Length configurations | 878mm(including 1.25" adapter as dew shield contracted） 963mm(including 1.25" adapter as dew shield fully stretched） 941mm(including the photographic adapter as dew shield contracted） 1026mm(including the photographic adapter as dew shield fully stretched） |
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Data sheet
Askar 131F The Askar 131F is a 131mm aperture refractor with a 983mm focal length at f/7.5. Its air-spaced quadruplet uses a front triplet and rear correcting element, including one ED element. The integrated optical design supports a 44 mm full-frame image circle.
Manufacturer model: Askar 131F · Specifications checked against manufacturer data on 2026-11-04
