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The Askar 0.74x focal reducer for the 111F APO is a dedicated reducer-corrector designed specifically for the Askar 111F Flat-Field telescope. It shortens the system focal length to 566 mm and changes the focal ratio to f/5.1, providing a wider field of view and shorter exposure times for deep-sky astrophotography. The reducer’s optical system maintains field correction and supports a 44 mm image circle suitable for full-frame sensors.
• dedicated 0.74x focal reducer for the Askar 111F Flat-Field telescope
• reduces the focal length of the Askar 111F to 566 mm
• changes the system focal ratio to f/5.1
• provides a wider field of view and shorter exposure times
• triplet optical design
• flat-field correction for astrophotography
• 44 mm image circle suitable for full-frame cameras
• 55 mm backfocus from the base of the M48 male thread
• M68 × 1 thread on both sides of the reducer
• rear adapter with M48 × 0.75 filter thread for 2" filters
• direct connection to the 111F photographic extension tube
• precision CNC-machined housing
• front and rear metal threaded protective caps
• convex front lens - avoid touching it during installation
• Askar 0.74x focal reducer for 111F
• front metal threaded protective cap
• rear metal threaded protective cap
• manufacturer: Askar
• model: 111F 0.74× Reducer
• accessory type: focal reducer / field corrector
• compatibility: Askar 111F Flat-Field
• reduction factor: 0.74x
• resulting focal length with Askar 111F: 566 mm
• resulting focal ratio with Askar 111F: f/5.1
• optical design: triplet
• image circle: 44 mm
• full-frame support: yes
• backfocus: 55 mm from the base of the M48 male thread
• front thread: M68 × 1
• rear thread: M68 × 1
• filter thread: M48 × 0.75 / 2"
• outside diameter: 72 mm
• mechanical length: 80 mm
• weight: 0.5 kg
The Askar 0.74x reducer for the 111F turns the Askar 111F into a faster astrograph with a wider field of view while preserving the field correction required for full-frame imaging.
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