How does my mirror look?

[TheMan]

Just finished figuring my first telescope mirror about a week ago, put it on the star tester and had a look. I took a snap of it and although I think it looks good but I'd like a second opinion. 

Take into consideration it's not collimated as it should be, but I only had gaps in between the clouds and didn't have time to collimate properly.

8 inch f/5 8mm eyepiece

Edited April 24, 2020 by TheMan

[Stu Todd]

Your mirror making will benefit from a Ronchi tester, and learning the patterns different shaped mirror faults produce. A cheap and simple Ronchi knife edge tester would be a good place to begin.

Have a look at https://stellafane.org/tm/atm/test/ronchigrams.html, plenty of info there.

Stu

[davidc135]

Try also to take out of focus photos both inside and outside of focus and ensure both distances are exactly the same. (use shims) The distance you have in the photo looks OK. The relative size of the secondary shadows can be compared and will give a useful idea although it's rough compared to a Ronchi or Foucault test.   David