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Exit pupil/Eye relief
Thanks to both of you for the time taken to answer my questions. It did not occur to me that there was a difference between eye lens and field lens. Must find out about Powermate. And now I see the use of the message about using small apertures for EXIT PUPIL as opposed to eye relief.
I was aware of the issue regarding the pupil not being able to shrink enough for small apertures but I was getting E pupil mixed up with ER.
I don't believe that I have astigmatism, Renato. I don't have any problem with binoculars. Your tip about taking the cup off the EP is one that I will try out next time we have a break in the weather (usually at full moon!) We desperately need the rain that we are getting now but its getting a bit wearing.
I will copy you inputs for further reading.
Very grateful.
Cheers!
Bert
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