Askar FRA400C The Askar FRA400C is a 72 mm, 400 mm f/5.6 quintuplet astrograph for astrophotography, everyday photography and visual observing. Its two-ED optical design covers a 44 mm full-frame image circle.
Manufacturer model: Askar FRA400C · Specifications checked against manufacturer data on 2026-11-04
The Askar FRA400C is a 72 mm, 400 mm f/5.6 quintuplet astrograph for astrophotography, everyday photography and visual observing. Its two-ED optical design covers a 44 mm full-frame image circle.
Aperture and camera connection
A 17-blade diaphragm adjusts from f/5.6 to f/22, and minimum focus is 5 m. The front accepts M82 filters. At the rear, M72/M54/M48 photographic adapters include a built-in M48×0.75 filter thread. The native camera connection range is 50–60 mm, with 55 mm recommended.
Focusing and mounting
The single-speed helical focuser locks and provides adjustable damping. MXL teeth allow an optional motor-focuser belt installation. The tube can rotate for framing. The mounting ring provides accessory holes and two finder bases, with a multifunction handle and a 290 mm Vixen-style dovetail. Tripod attachment provisions include M6, 1/4-inch and 3/8-inch threads.
Visual use and dimensions
The manufacturer includes 1.25-inch and 2-inch eyepiece adapters. OTA weight is 2.68 kg, or 3.18 kg with handle and dovetail.
Native camera connection range is 50–60 mm, with 55 mm recommended. Product table and manual operating text say two ED elements; a manual specification line says SD.
Additional specifications
Aperture blades
17 pieces
Aperture range
f/5.6-f/22
Minimum focus distance
5m
Focusing mode
Manual focus
Front filter thread
M82
Weight with handle and dovetail
3.18kg
Tripod mounting threads
M6; 1/4-inch; 3/8-inch
86029
Data sheet
Aperture
72mm
Camera connection distance
Support 50-60mm range (Recommended connection length is 55mm)
Dew shield
Retractable
Dovetail
290 mm Vixen-style
Field correction
Integrated Petzval-like system
Finder bases
2
Focal length
400mm
Focal ratio
f/5.6
Focuser
Single-speed helical; lockable with adjustable damping and MXL belt teeth
Image format
44mm
Length configurations
370 mm and 420 mm published; manufacturer dew-shield configuration wording is inconsistent
Manufacturer standard package
FRA400C OTA with four-piece photographic adapter; 1.25-inch and 2-inch eyepiece adapters; rings; handle; dovetail; documentation
Model
FRA400C
Optical design
Quintuplet dual ED air-spaced APO
OTA weight
2.68kg
Rear adapter
M72/M54/M48(with M48×0.75 filter thread)
Rotator
Whole-OTA orientation adjustment
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Askar FRA400C The Askar FRA400C is a 72 mm, 400 mm f/5.6 quintuplet astrograph for astrophotography, everyday photography and visual observing. Its two-ED optical design covers a 44 mm full-frame image circle.
Manufacturer model: Askar FRA400C · Specifications checked against manufacturer data on 2026-11-04
