The Skywatcher Focal Reducer for the Evostar 72ED 0.85x is an essential optical accessory for astronomy enthusiasts. Designed specifically for the Sky-Watcher Evostar 72ED APO telescope, it significantly enhances the astrophotography experience.

• Compatibility: Works seamlessly with APS-C and full-frame camera sensors, with APS-C recommended for optimal results.
• Focal Length Reduction: Reduces the original focal length from 420 mm (f/5.8) to approximately 355 mm (f/4.93), making your optical system faster.
• Exposure Time: Decreases required exposure times by about 38%, allowing faster shots without sacrificing quality.
• Field of View: Provides a wide field of view of approximately 5.8° x 3.87° with full-frame cameras, and about 3.79° x 2.53° with APS-C sensors.
• Back Focus Distance: Requires an exact back focus distance of 55 mm for optimal performance.
• Mounting: Includes a screw mount adapter for secure attachment to the focuser, with M48x0.75 threading for various camera connections.

Using this reducer lens allows astrophotographers to not only speed up their exposures but also achieve a flatter and well-corrected field of view. Optical corrections ensure sharp stars with minimal optical distortions, making it a must-have accessory for deep sky astrophotography.