Aperture ring for 200mm SkyWatcher Newtons

Primary mirrors in Newtonian telescopes are usually fixed with 3-6 brackets. Sorry - not fixed, but only secured against falling out. These cover a small corner from the edge of the mirror, but are hardly noticeable when viewed visually. But as soon as you take pictures, diffraction phenomena become visible around brighter stars. In addition to the bright spikes typical of Newton's that come from the secondary mirror spider, dark radial artifacts can also be seen. The brackets of the main mirror are responsible for this. But even if the extension tube protrudes over the edge of the mirror, and even more so if the mirror has a small turned down edge, these unsightly diffraction artifacts are mercilessly visible.

A correctly placed aperture ring with a precisely milled edge completely prevents all of this! See the comparison photos for yourself!

The positive effects:

• eliminates the diffraction phenomena of holding clips of the main mirror
• the artifact of a slightly protruding extension tube will be avoided
• the artifacts of an irregularly shaped bevel on the mirror are removed
• a falling edge of the main mirror is masked

Installation made easy! It is not necessary to remove the primary mirror from the primary mirror socket !!!!

Fits to the following models:

• SkyWatcher 200/800 (8" f/4) Quattro
• SkyWatcher 200/1000 Newtonians and its variants
• Celestron 200/1000 Newton
• Orion (USA) 8 inch Newton