Field Flattener f/5 to f/7 firstlight and Celestron) finder scope brackets

and Celestron) finder scope brackets

25-inch Dia

The medium Vixen-style saddle plate is 7

designed for users who want powerful magnification in a compact

Whether you're hunting

Field Flattener f/5 to f/7 firstlight and Celestron) finder scope bracketsWhen doing astrophotography with refractor type telescopes, the faster the focal ratio the more field curvature becomes a problem. Field curvature will appear in the corners of astrophotographs, making the stars smear perpendicular to the axis of the image. This is called coma coma is Latin for comet, because the stars look like comets. The more the curvature, the closer to the center the coma appears. The larger the sensor, the worse the coma.