Skip to main content

All Questions

Filter by
Sorted by
Tagged with
1 vote
2 answers
272 views

Did Edmund Scientific 4¼ inch Newtonians have 90° prisms as secondary mirrors in the 1970's?

I mentioned my old telescope's secondary mirror in this answer (stiffness) but I'm not certain I am remembering correctly. My first telescope was a Edmund Scientific 4¼ inch Newtonian reflector. This ...
uhoh's user avatar
  • 30.7k