The Skywatcher ED80 Focal Reducer 0.85x is an excellent optical accessory designed for Sky-Watcher ED80 refractor telescopes. It significantly reduces the telescope's focal length by 0.85x, changing the focal ratio from f/7.5 to approximately f/6.3. This adjustment widens the viewing field and allows for faster astrophotography exposures.

• Focal reduction factor: Reduces from f/7.5 to f/6.3 for ProED/Evostar 80ED APO telescopes.
• Back focus distance: Requires 55mm distance for optimal focus.
• Threads: M48, compatible with T-ring adapters for various DSLR cameras.
Compatibility: Designed for Sky-Watcher ProED 80 and Evostar 80 ED APO telescopes.
• Field correction: Corrects distortions at the edge of the field, crucial for wide-field astrophotography.

This accessory is ideal for enthusiast astrophotographers looking to expand their imaging capabilities without compromising optical quality. By increasing speed and providing a flat image plane, it enables brighter and quicker captures of celestial objects with improved sharpness. The Skywatcher ED80 Focal Reducer 0.85x is an essential tool for amateur astronomers dedicated to astrophotography, enhancing the performance of Sky-Watcher ED80 telescopes.