ASKAR 0.7x FLATTENER AND REDUCER FOR FRA400 & FRA500 BF25-SW When the mount is set

When the mount is set in alt-azimuth mode

elongation and stress

Low expansion glass optical set

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ASKAR 0.7x FLATTENER AND REDUCER FOR FRA400 & FRA500 BF25-SW When the mount is setThe field flattener & reducer for the ASKAR FRA 400 & FRA 500 is a dedicated corrector with a reducing power of 0. 7X. It shortens the focal length from 400mm to 280mm and the focal ratio from f 5. 6 to f 3. 9 halving the exposure time. The working distance between the flattener and the sensor is 55mm. The flattener reducer can be connected to the focuser of the Askar FRA 400 & FRA 500 using the M68 x 1 male thread, on the camera side there is the