Effect of CA on the size of the exit pupil?

Stephen Tonkin wrote:
wrote:
what is the effect of the central obstruction

Nothing. A working definition of the exit pupil is "the image, formed
by
the eyepiece, of the aperture". The aperture, and hence the exit
pupil
size, is unaffected.

Best,
Stephen

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Thanks for that. It's just I'd uploaded an Excel spreadsheet that I'd
made to calculate EP values to the Yahoo Chinese refractor group. But
forgot to add the creavet that I hadn't allowed for scopes with a CA.
thanks again
Gaz