Askar FRA300 PRO The Askar FRA300 PRO is a 60 mm aperture, 300 mm focal-length astrograph operating at f/5. Its five-element, fully air-spaced Petzval design contains one ED element and covers a 44 mm full-frame image circle.
Manufacturer model: Askar FRA300 PRO · Specifications checked against manufacturer data on 2026-11-04
The Askar FRA300 PRO is a 60 mm aperture, 300 mm focal-length astrograph operating at f/5. Its five-element, fully air-spaced Petzval design contains one ED element and covers a 44 mm full-frame image circle.
Native flat-field optics
Field correction is built into the optical system. At native focal length, achieve focus within the available connection range rather than adding a separate flattener and setting a fixed 55 mm spacing. The manufacturer lists 67 mm maximum connection from the M48×0.75 thread base and 71 mm from the M42×0.75 reference, with the focuser retracted.
Focusing and framing
The 2.5-inch rack-and-pinion focuser has coarse and fine adjustment, plus a 360° rotator. The standard rear connection is M48×0.75, with separate M42×0.75 and M54×0.75 adapters listed in the package. CNC-machined construction and fully multicoated optics complete the design.
Mounting and transport
A multifunction handle and 300 mm Vixen-style dovetail provide mounting and balance adjustment. Askar lists a 303 mm total length, 2.26 kg bare OTA and 3.12 kg including mounting hardware. The M54 connection-limit reference has inconsistent pitch wording on the manufacturer page; use the supplied adapter drawing when arranging that connection.
The manufacturer lists an M54×0.75 supplied adapter but labels the M54 distance reference M54×1 in the connection table. No uncertain M54 pitch is asserted for that 71 mm reference; M42/M48 references are unambiguous.
92758
Fiche technique
Diamètre
60mm
Traitement
Fully multicoated
Queue d'aronde
300 mm Vixen-style
Correction de champ
Integrated Petzval; no external flattener required
Focale
300mm
Rapport F/D
f/5
Porte-oculaire
2.5-inch rack-and-pinion, dual speed
Poignée
Multifunction; finder-base compatible
Cercle image
44mm full-frame
Configurations de longueur
303mm
Contenu standard du fabricant
a tube ring, a handle, an Askar 300mm Vixen dovetail plate, a M54×0.75 adapters, a M42×0.75 adapters, a warranty，a manual
Askar FRA300 PRO The Askar FRA300 PRO is a 60 mm aperture, 300 mm focal-length astrograph operating at f/5. Its five-element, fully air-spaced Petzval design contains one ED element and covers a 44 mm full-frame image circle.
Manufacturer model: Askar FRA300 PRO · Specifications checked against manufacturer data on 2026-11-04
