Development of the aperture ring for Newton mirrors

We thought it would be a good idea to share the history of the development of our aperture rings for the primary mirrors of Newtonian telescopes.

We planned to offer an aperture ring that, unlike previously offered aperture rings, would not require the screws for securing the primary mirror to be loosened. This would make for a much simpler mounting solution.

Of course, the aperture ring must be tight enough so that it doesn't come loose during transport or use.
 

First, the dimensions of the primary mirror, its mounts, the mirror cell, and the main tube were taken.

Then, a first Mk1 prototype was developed and printed:

The goal was to attach the aperture ring to the primary mirror's retaining clamps using a clamping mechanism. Initial tests were promising, so the design was improved.

A side panel was added. The Mk1.1 prototype shown above was printed from a very matte material, which, however, didn't optimally meet the mechanical requirements. Therefore, the material selection was changed.

We usually develop prototypes using white material. This way, they cannot be confused with later versions for the public.

During field testing, however, we discovered that the retaining clips were not 100% reliable. Some broke off, some lost their clamping force. This rarely happened, but safety is our top priority. Therefore, the design was rejected.

The Mk2 prototype was equipped with very strong magnets.

Finally, all requirements were met. The first samples were tested in the field by our testers and received enthusiastic feedback.

This is what the finished product looks like:

In addition, the lens rings are coated with a special black paint to reduce reflections as perfectly as possible.