Optical Accessories

This reducer reduces the focal length of the Askar 111F by a factor of 0.74x and significantly shortens the exposure time in astrophotography

• The reducer was designed for the Askar 111F flat-field apochromat
• The focal length is reduced to 566mm
• The focal ratio is improved from f/6,9to f/5.1
• A triplet design maintains the flat field
• The reducer is screwed directly onto the M68x1 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

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