Field Flattener f/5 to f/7

Field Flattener f/5 to f/7When 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.

(3) AA Batteries required - Not Included

soft light baffle and two radial main mirror fans for fast temperature equilibrium

Measure the indoor climate conditions in your living room

electricity flows through the receiver coil

This camera-specific bayonet adapter is designed for Nikon DSLRs and features a large M48x0

Its innovative truss tube design allows easy disassembly without tools for compact transport and quick setup—even fitting in small cars

this Dobsonian is built for high-performance visual astronomy

Alpen UBX multi-layer coating for maximum light transmission

Especially in times of increasing light pollution

brighter images and less exposure time

Constructed of opaque black nylon with excellent stretch

LCD temperature display (°C/°F)