Astrophotographers hangout. Invite friends and notice chat bar on bottom.

defocus a bright star, center it, and the secondary mirror provides a shadow so that when the scope is perfectly collimated there is a round shadow in the middle of it. I could not get it round, or in the middle, suggesting primary mirror was off.

  • Currently 0/5 stars.

Views: 33


You need to be a member of AstroGab to add comments!

Join AstroGab

© 2020   Created by Charles Dunlop.   Powered by

Badges  |  Report an Issue  |  Terms of Service