Sky-Watcher 0.85x Reducer/Flattener for EvoStar 72ED
Sky-Watcher 0.85x Reducer/Flattener for EvoStar 72ED
This Sky-Watcher 0.85x Reducer/Flattener EvoStar 72ED Refractor provides a flat field across a 44 mm image circle while also reducing the f/ratio from native f/5.8 (420mm) to f/4.93 (355mm). This means you’re at liberty to use some of today’s largest sensors with this Sky-Watcher telescope, offering pristine detail from corner to corner. You can expect sharp stars across the entire field of view, and 38% faster exposure times, turning this system into a high-performance astrograph.
Technical Specifications
- Compatible with both APS-C and full frame sensors, APS-C (crop sensors) and smaller recommended
- 55mm back focus
- Drops f/ratio from native f/5.8 (420mm) to f/4.93 (355mm)
- Reduces exposure time by 38% compared to native f/5.8
- 5.8 x 3.87-degree field of view when used with a full frame camera
- 3.79 x 2.53-degree field of view when used with APS-C crop sensor
- Includes thread-on adapter to mount reducer to Evostar 72ED focuser