Askar f/3.9 full frame reducer for FRA 

The ASKAR 0.7x full-frame focal length reducer improves the focal ratio of the FRA600 from f/5.6 to f/3.9, halving the exposure time

♦ The reducer provides a corrected field of view up to full format

♦ Screwing via the M68x1 thread on the focuser of the FRA600

♦ The focal length is reduced from 600 mm to 421 mm for a larger field of view

♦ Working distance 55 mm from the M48x0.75 connection thread

♦ 2" filter thread is available on the connection adapter

 

Askar F3.9 full-frame focal length reducer for FRA600/5.6

The new Askar FRA400 F3.9 full-frame reducer reduces the effective focal length of the telescope by a factor of 0.7x. The original f/5.6 apo becomes an f/3.9 apo. Your exposure time will be significantly shorter, reduced to about 50%. The field of view becomes significantly larger.

The reducer was designed for use with the FRA600 flatfield refractor and provides good correction with this telescope, even when full-frame sensors are used. The working distance from the M48x0.75 thread to the camera sensor is 55 mm. The camera adapter is equipped with a 2" filter thread. The reducer can also be used with other flatfieldapos from 100 mm aperture, provided they have the corrector installed in the tube and not in the focuser.

 

Suitable for:	FRA600 108 mm f/5,6 Flatfield Apo
Focal length reduction:	Factor 0,7x
Working distance:	55 mm from the M48x0.75 connection thread

♦ Askar Reducer