Product no.: ASRED91F

Askar 0.75x Reducer for 91F Flatfield Apo

This reducer shortens the focal length of the Askar 91F by a factor of 0.75x, significantly reducing exposure time in astrophotography.

The reducer is designed for the Flatfieldapo 91F.

The focal length is reduced to 455 mm.

The aperture ratio is improved from f/6.7 to f/5.

A triplet design with ED glass ensures high field quality.

The reducer is screwed onto the M59x1 thread of the apochromatic lens extension.

The camera-side connection is M48x0.75 (via adapter).

The working distance from the M48 thread is 55 mm.

M48x0.75 thread for 2" filters.

Askar 0.75x Reducer for 91F Flatfield Apochromatic Lens

The focal reducer shortens the focal length of the flatfield apochromatic lens from 609 mm to 455 mm. Field correction is maintained. Exposure times are reduced by approximately 56%. The reduction factor increases the field of view, making the apochromatic lens even more suitable for wide-field applications. The 0.75x reducer is particularly useful when working with smaller sensors. A true alternative to an additional telescope or camera lens.

Type: Focal Reducer
Suitable for: Askar 91F Flatfield APO
Crowsing Factor: 0.75x
Optical Design: Triplet with ED glass
Connection on both sides: M59x1 thread
Camera connection: M48x0.75 (via adapter)
Working distance: 55 mm from the M48 thread
Filter connection: M48x0.75 thread for 2" filters
Weight: 0.3 kg

Focal Reducer
Dust Caps

 

Price:

236,00 EUR

19 % VAT incl. excl. Shipping costs