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Hi Bert,
I haven't read the article, but I do have eye aberration (astigmatism), and if the expert is advocating the use of smaller exit pupils on EPs to counter eye aberrations - he is correct. Stars and objects are much sharper for me with smaller exit pupils. Even when out in the city at night, and I am having a hard time reading an LED sign, I just put my two thumbs and index fingers together, forming a tiny exit pupil, and I can then easily read the sign.
As I understood it, using a Barlow or long eyerelief eyepieces is extremely handy, mainly because one can wear eyeglasses and correct the eye's aberration, while still maintaining a large exit pupil and seeing the brighter, wider image.
What you say about not saying all the eyepiece field of view happens to me with a few of my very shallow eyerelief eyepieces with rubber eyeguards attached. But when I remove the rubber eyeguard and get closer to the lens, the problem goes away.
You should also have the exact same problem of not seeing the entire field when looking through binoculars - do you?
Regards,
Renato
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