[Herb]

Hello All

First-time poster, long-time lurker.

I'm hoping some-one can assist me, I'm having trouble getting my head around the terms "apparent field of view" and "true field of view".

I have looked up the definitions and formulae for both - what puzzles me is the use of the word "apparent".

For instance, in a previous thread there is a discussion regarding 100 degree (AFOV) eyepieces. Now I know I'm not going to see from the horizon to zenith with one of these eyepieces, so in what sense is the word "apparent" being used?

Regards

Herb