The Askar 0.75× reducer for the Askar 60F is engineered to enhance astrophotography performance by shortening the focal length and providing built-in field flattening. After installation, the 60F operates at 311 mm focal length and f/5.1, delivering a wider field of view and shorter exposure times—ideal for imaging large nebulae, dense star clusters, and faint or fast-moving deep-sky objects.

Key features

• reduces the Askar 60F focal length to 311 mm and focal ratio to f/5.1
• integrated field-flattening correction optimized for full-frame imaging
• triplet optical design
• supports a 44 mm full-frame image circle
• standard 55 mm back focus measured from the base of the M48 male thread
• M50 × 1 threads on both ends for convenient system integration
• compatible with the 60F photographic extension tube (M54 × 0.75 and M48 × 0.75 adapters)
• built-in M48 × 0.75 internal thread for direct installation of 2-inch filters
• CNC-machined metal body for excellent rigidity and durability
• supplied with front and rear threaded metal caps for dust protection

Included items

• Askar 0.75× focal reducer for 60F (triplet)
• front threaded metal cap
• rear threaded metal cap

Technical specifications

• application: focal reducer for Askar 60F
• focal length after installation: 311 mm
• focal ratio after installation: f/5.1
• optical design: triplet
• corrected image circle: 44 mm
• back focus: 55 mm (from the base of the M48 male thread)
• mechanical threads: M50 × 1 (front and rear)
• filter thread: M48 × 0.75 (2" filters)
• weight: 0.2 kg
• construction: anodized CNC-machined body