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 €
Tasse incluse

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

Scheda tecnica

Apertura
90mm
Paraluce
Retractable
Coda di rondine
300 mm Losmandy-style
Correzione di campo
Integrated 3+2 Petzval
Rapporto della messa a fuoco fine
1:10
Focale
500mm
Rapporto focale
f/5.6
Focheggiatore
3.5-inch rack-and-pinion, dual speed
Cerchio d'immagine
55mm
Configurazioni di lunghezza
452mm（407mm when the dew shield is contracted）
Dotazione standard del produttore
An FRA500 OTA, a pair of tube rings, a handle, an Askar Losmandy dovetail plate, a conical extender, a manual
Modello
FRA500
Schema ottico
Quintuplet air-spaced APO (including two ED glass)
Riduttore opzionale
Matching FRA400/FRA500 f/3.9 reducer; sold separately
Peso del tubo ottico
4.1kg
Filettature posteriori
86×1
Peso con anelli e coda di rondine
5.2kg
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