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
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.
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 store title 108/600 Quintuplet matches the manufacturer FRA600 aperture, focal length and quintuplet dual-ED design. The technical table specifies M48×0.75; an introductory M48×0.85 typo is not used. 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
Fiche technique
Diamètre
108mm
Backfocus
160mm (from the end of rotator M90x1 thread)
Pare-buée
Retractable
Correction de champ
Integrated quintuplet Petzval
Démultiplication de la mise au point fine
1:10
Focale
600mm
Rapport F/D
F5.6
Porte-oculaire
4.2-inch rack-and-pinion
Cercle image
66mm
Modèle
FRA600
Formule optique
Quintuplet flat-field APO (including two ED elements)
Réducteur en option
Matching FRA600 f/3.9 full-frame reducer; sold separately
Longueur totale
493mm
Adaptateur arrière
M108x1 male thread (no rotator), M90x1 male thread, 2" adapter/ 1.25" adapter
Diamètre du tube (mm)
125
Poids avec colliers et queue d'aronde
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
