I keep reading how APO refractor owners like their views through their telescopes because they make the sky look like dark velvet. How does this happen? I have never looked through an APO before so I am curious.
Is there something intrinsic in APO refractors that darkens the skies, vs a large 12" reflector?
I can see this darkening effect when I use a zoom eye-piece. The sky does become dark when I change the ep focal length from 24mm to 8mm. So one possible explanation is that APO owners use high power eye-pieces more often than Achro or reflector owners. Also could it be that they use high-end Televue eyepieces?
Edited by sunrag, 27 September 2020 - 11:58 AM.