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Message: <blockquote data-quote="ceasar" data-source="post: 3249825" data-attributes="member: 26155">These SE binoculars all have a long ER of 17mm and they also have a reputation for eye placement problems which cause a blackout phenomenon known as "kidney beaning" for some people who use them.  Like myself.  Others are not affected by it.  It is a problem caused by the design of the eye piece.  The official name given the problem escapes me now but someone will be by shortly with it.For this reason you must try them out before before you buy them.If you are not affected by it ignore the following advice about how to defeat it. There is a technique that defeats this "kidney beaning."  It is called that because the blacked out area is shaped like a kidney bean.The method used when you are wearing glasses is to press the eye cups firmly against your glasses and very, very slightly tilt the binocular up.  With a little bit of experimentation this works for most people who experience this problem.Bob</blockquote>