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Message: <blockquote data-quote="ceasar" data-source="post: 1418073" data-attributes="member: 26155">I think it is the design of the eyepieces that causes the blackouts in the SE for some people.  There is only 4mm difference in ER. (Let me correct that; I just measured my spare eyecups.)  The EII's eyecups measure 14mm in length off the binocular and the SE's are 18mm in length off the binocular)  I assume that this corresponds to 4mm difference in ER, which makes them both a bit short in the ER department.  I have both binoculars.  The only binoculars I had Blackout trouble with were my old Leitz 7 x 42's which had very long 22mm ER.  I learned how to use them and the problem went away.The EII, IMO, is the easiest binocular to use that I have ever handled.  Pointing them on target is almost instinctive.  The SE is better than the EII in all respects except handling.  I have to position it at my eyes somewhat differently than I do the EII.  It's an individual thing, I think, and Frank and John touch on it in the comments above.  I'm not going to get into it here, because I don't think it will be much help to others.  I do encourage people who have problems using the SE to spend some time with them, experimenting so to speak, with subtle variations in eye positioning.  If you can get comfortable with them it will be well worth the effort.Their view is spectacular!Bob</blockquote>