250mm Apertur-diaphragm

The star image of my Newton ...

Workspace. Video conference with Tommy Nawratil.

My bag of tricks is empty: on all my astrophotographs, around the stars, with the spikes, there are unsightly halos with dark areas.

Desperate question. Quick reply. The brackets on the main mirror edge! Naturally!!!!

Elegant solution: precisely milled aperture rings for the primary mirror! Of course from Lacerta.

Aperture ring for Newtonian primary mirror

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 falling 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

Test photo - click here

Installation made easy!

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

Fitting:

    SkyWatcher 150/750 Newton

    Celestron 150/750 Newton

    Orion (USA) 6 inch Newton

    SkyWatcher 150/1200 Planet Newton

    and many others ....