Is there such a thing as too much
eye relief if you wear glasses when you use a
binocular? This is a question that I do get, though not too often. In case you are wondering, the answer is , yes, there is certainly such a thing as too much eye relief in a binocular. As with so many things, too much of a good thing is not always so good. Too much
eye relief in a
binocular, specifically, causes "blinking" or "blackouts" at the edge of the field, which can be annoying and distracting.
My
Nikon 8x32 Superior E, with its 17mm + of eye relief (my preferred ER is 14mm) is notorious for this and, oddly enough, it is more of a problem in bright light when the pupils of my eyes are stopped down, but less of a problem in dim light when my pupils are more dilated. Anyway, when needed, I roll the eyecups out a bit and proceed. This is where I would prefer a twist up eyecup design with multiple stops, rather than the old fold down rubber eyecups. Twist ups that offer a variety of height settings make it easier to deal with a binocular that has a bit too much eye relief.
Does that mean I am going to part with my Nkon SE? Not even if you held a gun to my head!