Askar FRA600 The Askar FRA600 is the 108 mm aperture, 600 mm focal-length quintuplet astrograph listed in this store as the 108/600 OTA. It operates at f/5.6 and uses a front triplet plus rear doublet, including two ED elements. Askar specifies a 66 mm image circle.
Manufacturer model: Askar FRA600 · Specifications checked against manufacturer data on 2026-11-04
It operates at f/5.6 and uses a front triplet plus rear doublet, including two ED elements. Askar specifies a 66 mm image circle.
Native imaging system
Field correction is built in. Assemble the train within the available connection allowance and focus the telescope; native use does not require an external flattener at a fixed 55 mm distance. The manufacturer specifies 160 mm from the M90×1 rotator reference to the focal plane.
Focuser and interfaces
The 4.2-inch rack-and-pinion focuser has 1:10 fine adjustment. Connections include M108×1 without the rotator, M90×1, and the sectional M90/M68/M54/M48 conical adapter. The included 2-inch and 1.25-inch adapters also support visual observing.
Mounting and dimensions
The 125 mm diameter tube has a retractable dew shield and a published 493 mm overall length. Multifunction tube rings, handle and dovetail are included. The technical table lists 6.5 kg including rings and dovetail; its 7.8 kg figure is packing weight excluding the aluminium case. A dedicated f/3.9 reducer is optional.
The table calls 6.5 kg the total with rings and dovetail; 7.8 kg is packing weight excluding the aluminium case.
Additional specifications
Manufacturer packing weight
7.8kg(not include Aluminum case)
Conical adapter threads
M90×1-M68×1-M54x0.75-M48×0.75
Manufacturer accessories
A pair of tube rings, a handle, a dovetail plate, sectional conical tube adapter (with M54X0.75 and M48x0.75 male thread), an inspection list, a manual
Tube rings
Multifunctional; accessory mounting points on three sides
85490
Data sheet
Aperture
108mm
Backfocus
160mm (from the end of rotator M90x1 thread)
Dew shield
Retractable
Field correction
Integrated quintuplet Petzval
Fine focus ratio
1:10
Focal length
600mm
Focal ratio
F5.6
Focuser
4.2-inch rack-and-pinion
Image circle
66mm
Model
FRA600
Optical design
Quintuplet flat-field APO (including two ED elements)
Optional reducer
Matching FRA600 f/3.9 full-frame reducer; sold separately
Overall length
493mm
Rear adapter
M108x1 male thread (no rotator), M90x1 male thread, 2" adapter/ 1.25" adapter
Tube diameter (mm)
125
Weight with rings and dovetail
6.5kg
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Askar FRA600 The Askar FRA600 is the 108 mm aperture, 600 mm focal-length quintuplet astrograph listed in this store as the 108/600 OTA. It operates at f/5.6 and uses a front triplet plus rear doublet, including two ED elements. Askar specifies a 66 mm image circle.
Manufacturer model: Askar FRA600 · Specifications checked against manufacturer data on 2026-11-04
