[rider]

Greetings all

OK, I’m relatively new at this and I am trying to get an understanding of the factors which influence eye-piece selection. (other than quality)

These are my assumptions. Please free to correct my misunderstandings.

Assuming the same scope is used, I think that the real view from a particular lens is a function of
-Magnification (as defined by the MM of the lens X the focal length of the scope)
- Apparent Field Of View (as defined by eye piece manufacturer)

If this is so,


Am I right in assuming that for a 2500 F.L. telescope, a 16mm lens with a AFOV of 82 degrees will provide much the same view as a 30 mm lens with a AFOV of 43 degrees

Both end up with a 0.5 -ish view

I think they will both have the same area of stars in frame, so would duplicate each other.

Am I missing something.


Rider