Askar FRA500 90/500 Astrograph | PixelSkiesAstro
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  • Askar FRA500 90/500 Astrograph | PixelSkiesAstro
  • Askar FRA500 90/500 Astrograph | PixelSkiesAstro
  • Askar FRA500 90/500 Astrograph | PixelSkiesAstro
  • Askar FRA500 90/500 Astrograph | PixelSkiesAstro

Askar FRA500 90/500 Astrograph

2 490,00 €
TTC

Askar FRA500 The Askar FRA500 combines a 90 mm aperture, 500 mm focal length and f/5.6 focal ratio. Its quintuplet 3+2 Petzval system includes two ED elements and supports a 55 mm image circle, extending beyond a conventional full-frame sensor.

Manufacturer model: Askar FRA500 · Specifications checked against manufacturer data on 2026-11-04

Askar FRA500

The Askar FRA500 combines a 90 mm aperture, 500 mm focal length and f/5.6 focal ratio. Its quintuplet 3+2 Petzval system includes two ED elements and supports a 55 mm image circle, extending beyond a conventional full-frame sensor.

Camera connection

Native field correction is integrated. Fit the camera train within the published connection limits and focus; an additional native flattener is unnecessary. Askar specifies 85 mm from the M48×0.75 conical-extender reference or 158 mm from the M86×1 rotator reference to the focal plane.

Focus and mounting

A 3.5-inch rack-and-pinion focuser provides coarse and 1:10 fine adjustment. The telescope includes a finder base, tube rings, multifunction handle and a 300 mm Losmandy-style dovetail plate. The retractable hood reduces transport length.

Dimensions and optional reduction

The technical table lists 407 mm contracted and 452 mm extended, with 4.1 kg bare OTA and 5.2 kg including rings and dovetail. A matching f/3.9 reducer is separately available for a wider, faster configuration and has its own prescribed camera spacing.

Askar manufacturer documentation

Compatibility notes

Length follows the technical table: 452 mm extended, 407 mm contracted. Introductory text instead rounds the contracted length to 410 mm.

Additional specifications

Maximum accessory connection85mm（from base of M48×0.75 thread on the conical extender to focal plane） 158mm（from base of M86×1 thread on the rotator to focal plane）
Conical adapter threads48×0.75
Finder baseIncluded
73035

Fiche technique

Diamètre
90mm
Pare-buée
Retractable
Queue d'aronde
300 mm Losmandy-style
Correction de champ
Integrated 3+2 Petzval
Démultiplication de la mise au point fine
1:10
Focale
500mm
Rapport F/D
f/5.6
Porte-oculaire
3.5-inch rack-and-pinion, dual speed
Cercle image
55mm
Configurations de longueur
452mm（407mm when the dew shield is contracted）
Contenu standard du fabricant
An FRA500 OTA, a pair of tube rings, a handle, an Askar Losmandy dovetail plate, a conical extender, a manual
Modèle
FRA500
Formule optique
Quintuplet air-spaced APO (including two ED glass)
Réducteur en option
Matching FRA400/FRA500 f/3.9 reducer; sold separately
Poids du tube optique
4.1kg
Filetages arrière
86×1
Poids avec colliers et queue d'aronde
5.2kg
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