Cheshire and Farsightedness

We test and collimate every telescope we issue or ship to a customer.

However, I encountered a problem when collimating the Newtonians. I'm farsighted, and when using the Cheshire adjustment eyepieces, I can't see the engraved centering rings or the secondary mirror clearly. I could possibly see both with glasses, but the forced eye relief makes the hole so small that I can only see a tiny area.

So, a tool came in handy: a cell phone holder for eyepieces.

This idea also has the advantage that you can see how the secondary mirror behaves from a distance while adjusting it.

It looks like this:

Here, the secondary mirror is not centered on the optical axis.

After collimation, it looks like this:
 

If you have any questions or suggestions, please feel free to contact us.

Karsten