140 mm mechanical connection range; no reducer-style spacing required
Corrected field
Native full-frame flat field
Reducer / flattener
Optional 0.7× reducer: 280 mm at f/3.9
Mechanical
Weight
2.56 kg
Astrophotography Fit
Best for wide-to-mid-field nebulae and general deep-sky imaging when the mount, camera format, and correction hardware are chosen as one system.
Askar FRA400 sits in the telescope slot for wide-to-mid-field nebulae and general deep-sky imaging. The useful headline specs are aperture 72 mm, focal length 400 mm, f/5.6.
Camera coverage: Full frame / APS-C / Micro 4/3. Image circle: 44 mm. Back focus: 140 mm mechanical connection range; no reducer-style spacing required.
Refractors keep the field routine calmer: no regular collimation, predictable cooldown, and a clean path to autofocus and filtered imaging. The tradeoff is aperture and reach.
Weight matters here: 2.56 kg. Leave payload headroom for the camera, guider, focuser, dew control, and cables instead of judging the mount by bare tube weight alone.
Best paired with
Corrected field flattener or reducer when the design requires one
Cooled APS-C or smaller astro cameras matched to the image circle
Autofocus, guide scope or OAG, and a mount with comfortable payload margin
Not recommended for
Large full-frame sensors unless the corrected field supports them
Very small travel mounts near their realistic imaging payload limit
Buyers expecting one telescope to be ideal for every target size
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled
automatically from each retailer and updated daily.
