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Used: ASKAR FRA500 90 mm Öffnung f/5,6 Quintuplet Flatfield APO Astrograph

Name: Used: ASKAR FRA500 90 mm Öffnung f/5,6 Quintuplet Flatfield APO Astrograph
Brand: Askar Sharpstar
SKU: 2024-0204-2
Price: 1899 EUR

The ASKAR FRA 500/5.6 APO quintuplet apochromat from Sharpstar is optimized for astrophotography with high resolution cameras

Signs of use: Slight signs of use on the prism rail, optics slightly dusty and show traces of cleaning attempts (streaks), but the image is fine.

Aperture 90 mm

Focal length 500 mm / focal ratio f/5.6

5-element quintuplet design with corrector in tube

Two ED glasses in the triplet objective for very good correction of the chromatic aberration

55 mm image circle with full illumination and correction

158 mm maximum working distance from drawtube with all adapters for photography and observation

Stable 3.5" dual-speed RAP focuser with 360° rotation

Adapters to M68x1, M54x0,75, M52x0,75 and M48x0,75 are included in delivery

Starting with the M48 thread, you have comfortable working distance for all common astro cameras, DSLR and system cameras

Flexible Losmandy style dovetail bar with photo tripod connection and carrying handle with flexible oblong hole

Finder shoe for standard finder holders

Including inspection check list of the manufacturer

Manufacturer: Askar Sharpstar

Product number: 2024-0204-2

EUR 1.899,00RRP EUR 2.399,00you save 20.8% (EUR 500,00)

incl. 19 % VAT (DE)

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excl. 6.95 € shipping costs (DE)

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Used: ASKAR FRA500 90 mm Öffnung f/5,6 Quintuplet Flatfield APO Astrograph

The ASKAR FRA 500/5.6 APO quintuplet apochromat from Sharpstar is optimized for astrophotography with high resolution cameras

Signs of use: Slight signs of use on the prism rail, optics slightly dusty and show traces of cleaning attempts (streaks), but the image is fine.

Aperture 90 mm

Focal length 500 mm / focal ratio f/5.6

5-element quintuplet design with corrector in tube

Two ED glasses in the triplet objective for very good correction of the chromatic aberration

55 mm image circle with full illumination and correction

158 mm maximum working distance from drawtube with all adapters for photography and observation

Stable 3.5" dual-speed RAP focuser with 360° rotation

Adapters to M68x1, M54x0,75, M52x0,75 and M48x0,75 are included in delivery

Starting with the M48 thread, you have comfortable working distance for all common astro cameras, DSLR and system cameras

Flexible Losmandy style dovetail bar with photo tripod connection and carrying handle with flexible oblong hole

Finder shoe for standard finder holders

Including inspection check list of the manufacturer

Details..
Technical data..
In the box..
Reviews..

ASKAR FRA 500 90 mm f/5.6 Quintuplet Astrograph

ASKAR is the new line of selected telescopes for astrophotography. With these telescopes a high attention is paid to the optical, but also mechanical quality. FRA stands for refractor telescopes with integrated corrector element for a flat and corrected image field. The FRA series is mainly used for astrophotography.

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

The ASKAR FRA500 is a 5-element apo according to Petzval with 500 mm focal length, f/5.6 and 90 mm aperture. In the lens there are 2 ED glasses for a good correction of chromatic aberration. The apo is corrected for cameras up to full-frame.

The dew shield also provides good protection against stray light and is retractable. The large focuser holds even heavy cameras and allows clean focusing due to dual speed. The focuser offers a range of connections for all common astro threads. Also included is an adapter to M48x0.75, which is ideal for all cameras with 55 mm working distance. This adapter also has a possibility to screw in 2" filters.

Focusing the camera in the FRA500 apo

The corrector of the apo is permanently installed in the tube. As soon as you have focused the camera, you are also automatically at the correct distance. The laborious search for adapters in the appropriate thickness is no longer necessary.

A photo specialist, but also suitable for observation:

The ASKAR FRA400 is designed for astrophotography. However, due to the comfortable working distance, 2" star diagonals can also be connected. This turns the astrograph into a very nice spotting scope and telescope for astronomical observation and also landscape observation. We will be happy to advise you on the suitable adapter.

Increase of the speed to f/3.9

The focal ratio of f/5.6 is already relatively fast. But often one wishes for even faster optics. With the optional FRA400Red you can increase the speed from f/5.6 to f/3.9, thus halving the exposure time. The focal length is shortened to 351 mm.

Aperture:	90 mm
Focal length:	500 mm
Focal ratio:	f/5.6
Telescope type:	5-element quintuplet apo with 3-element ED lens
Transport length:	410 mm
Weight:	4.1 kg
Connection camera side:	M68x1 external, M54x0.75 male, M52x0.75 female and M48x0.75 male
Filter thread:	2" filter thread (M48x0.75) is integrated in the camera adapter