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Hi Daniel,
Thanks for the reply.
Unfortunately, I don't seem to have asked my question clearly.
I understand the formula - what I don't get is the use of the word apparent.
"apparent field of view is the eyepiece stated spec of 100deg".
I realise the field of view can't possibly be 100 Degrees, so where does the "apparent" come into it?
For instance, your example shows a true field of view to be 2 degrees in that particular scope, why then is that eyepiece "apparently" 100 degrees?
Hope I've explained myself better
Regards
Herb
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