The eyecups are problematic but useable for most (?) people. One adapts. I use the 10x42 L, my wife uses the 8x20 IS. She wears glasses and folds the eyecups down. She has never complained about the eyecups, and I have chosen not to tell her that they are considered a problem by many. When I use the 8x20, I don't wear glasses and have the cups up. Not the best but really not a problem either. Better for me than the eyecups on my Ultravid 8x20. With the 10x42, I have nowadays the eyecups mostly twisted in, with a couple of rubber O-rings keeping them in place, and it works fine.
I used to have the 15x50. With that, I mostly had the cups down although I did not wear glasses. I just pressed the flat eyepiece rims against my brow. Worked fine for me
With the 15&18x models and the 10x42, people with close-set eyes and/or large or thick noses might have more problems as the eyecup diameter is large. On the 10x42 it is 45 mm. This is why people often have the cups all the way down or do surgery on the rubber.
IS makes such a difference that I refuse to use anything else unless I happen to be somewhere without access to Canons. I've called non-IS binoculars muggle binoculars to make the point clear.
I'm not committed to Canon as a brand, but none of the other IS binoculars I have tried have worked as well for birding.
I used to have the 15x50. With that, I mostly had the cups down although I did not wear glasses. I just pressed the flat eyepiece rims against my brow. Worked fine for me
With the 15&18x models and the 10x42, people with close-set eyes and/or large or thick noses might have more problems as the eyecup diameter is large. On the 10x42 it is 45 mm. This is why people often have the cups all the way down or do surgery on the rubber.
IS makes such a difference that I refuse to use anything else unless I happen to be somewhere without access to Canons. I've called non-IS binoculars muggle binoculars to make the point clear.
I'm not committed to Canon as a brand, but none of the other IS binoculars I have tried have worked as well for birding.