- For short refractor telescopes with fast optics, this convenient fully multi-coated 38 mm clear aperture Orion Field Flattener eliminates field curvature.
- Works with refractors that have focal lengths between 400 mm and 660 mm, and focal ratios between f/5 and f/7.5.
- This Orion Field Flattener makes your fast refractor better suited for astrophotography, thereby unlocking its full potential.
- Flattens the field of view while maintaining the focal length attributes of your short refractor.
- Suitable for use with 2" focusers, this Orion Field Flattener requires a back focus of 55 mm.