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Askar 0.74x Reducer for 131F Flatfield Apochromat

Name: Askar 0.74x Reducer for 131F Flatfield Apochromat
Brand: Askar Sharpstar
SKU: ASRED131F
Price: 349 EUR

This reducer reduces the focal length of the Askar 131F by a factor of 0.74x and significantly shortens the exposure time in astrophotography

The reducer was designed for the Askar 131F flat-field apochromat

The focal length is reduced to 727 mm

The focal ratio is improved from f/7.5 to f/5.5

A triplet design maintains the flat field

The reducer is screwed directly onto the M72x1 female thread of the apos´ M78-M54 adapter

The apo´s photo adapters can be used directly

The working distance from the M48x0.75 thread on the camera side is 55 mm

Manufacturer: Askar Sharpstar

Product number: ASRED131F

EUR 349,00

incl. 19 % VAT (DE)

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excl. 7.95 € shipping costs (DE)

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Askar 0.74x Reducer for 131F Flatfield Apochromat

This reducer reduces the focal length of the Askar 131F by a factor of 0.74x and significantly shortens the exposure time in astrophotography

The reducer was designed for the Askar 131F flat-field apochromat

The focal length is reduced to 727 mm

The focal ratio is improved from f/7.5 to f/5.5

A triplet design maintains the flat field

The reducer is screwed directly onto the M72x1 female thread of the apos´ M78-M54 adapter

The apo´s photo adapters can be used directly

The working distance from the M48x0.75 thread on the camera side is 55 mm

Details..
Technical data..
In the box..
Manufacturer infos..
Safety informations..

Askar 0.74x Flat-Field Reducer for the 131F flat-field apo

The 0.74× reducer was developed specifically for the Askar 131F and reduces the focal ratio to a fast f/5.5. This shortens exposure times while providing a wider field of view for extensive celestial objects.

The built-in field correction ensures excellent star resolution from the center all the way to the edges of the image. This makes the reducer ideal for large nebulae, star fields, star clusters, and faint deep-sky objects.

The high-quality triplet design supports a 44-mm image circle, making it suitable for full-frame cameras. The working distance is 55 mm from the M48 thread. M72×1 threads on both ends ensure a stable and precise connection.

The compatible photographic extension ring for the 131F includes M54×0.75 and M48×0.75 adapters and allows for easy connection to the reducer. The rear adapter ring also features an M48×0.75 filter thread for 2" filters. The extension rings are included with the 131F apo.

The precision-machined, CNC-manufactured body offers high stability and a precise fit. Metal threaded caps for the front and rear reliably protect the optics from dust when the reducer is not in use.

Type:	Focal reducer
Suitable for:	Askar 113F flatfield apo
Optical design:	Triplet with ED glass
Mounting thread:	M72x1
Working distance:	55 mm from the M48x0.75 thread
Weight:	0.56 kg

Reducer

Photo adapters are not included

Manufacturer / Importeur:	Teleskop-Service Ransburg GmbH
Street:	Von-Myra-Str. 8
ZIP / City:	85599 Parsdorf
Country:	Germany
Telefon number:	+49 89 99228750
Email:	info@teleskop-service.de
Website:	www.teleskop-service.de