Good morning y'all!

I decided to make the big step: upgrade my 16 to a 20 inches, self made.

I'm trying to set a stable-but-portable scope and I was looking for a lightweight mirror in worldwide markets.

My eyes dropped onto these two mirrors: weights are really lighter than other Pyrex standard mirrors.


The next questions are

- What is their real optical quality?
- How much the coating is good in these two type of glasses?
- Is it durable through the years?
- Has the parabolized surface made without rugosity, considering they are industrial made mirrors?

I think these questions could be only answered by owners that had (hardly) tested and measured these optics alongside with precise benchmarks, and also have posted mirrors for many years.

I would be glad to discuss with you about mentioned issues.


Davide