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Message: <blockquote data-quote="typo" data-source="post: 3270581" data-attributes="member: 83808">I'm sure you understand that if your eye is too far from the eye lens then you will get a reduced field of view and if too close you get blackouts. How well the binocular works for you depends not only on the reach of the eyecup and the fine settings but on your facial features as well. The 7x42m has 17mm ER and may lead to some getting blackouts whereas the 15.9mm of the 8x42 would be fine. Others may need to twist in the 7x42 eyecups a little for the best view. Glasses complicate the issue. With my weak prescription, closs fitting design I needed to twist out the eyecups of the 7x42 a couple of millimetres to avoid blackouts but for others even the 17mm would be insufficient. Without them I just needed to remember not to push them too hard into my eyesockets.My preference was for the 7x42 in the Leica range. The field of view and steadiness are nice but the lower power mean a greater depth of field, which is a particular benfit to old eyes with little focal accomodation. I own binoculars with most magnifications, but the 7x and 10x are my most used depending on where and when. Others find a single 8x does all they need.David</blockquote>