MarkLeica 8x20; Nikon Action 7x35; Vixen Apex Pro 8x42; Orion 15x63; Docter Nobilem 15x60WO Megrez II 80 FD / APM 107mm f/6.5 / Mewlon 210 on DM-6 + Berlebach Planet
Michael Gilmer - Member of the Meteoritical Society & Collector of Falling Stars.
☄ ⒼⒶⓁⒶⒸⓉⒾⒸ ⓈⓉⓄⓃⒺ - www.galactic-stone.com
Quote: 1) a portion of the assembly that holds the prisms is somehow in the light path. This would be a factory defect issue.
2) Some piece of the binocular body, eyepiece assembly, or prism housing is intruding into the light path to produce the exit pupil deformation you see. Again, this would be a factory defect issue.
Quote: I just checked my 20 odd + binos [ yes.. I get therapy ] approx. 10 of them have BK-7 prisms - they do display the expected light cut off from the exit pupils - visible on two sides and visible in both barrells.
Quote:What exactly does "an internal mechanical issue" mean?
Quote:the exit pupil is just only ever so slightly off center...Only after pressing your eyes into the eyepiece (eye relief is deep on these binos) and rolling your eyes around searching for the edge of the field does it become apparent that the view is a light off center.
Quote:But I did try asking two people to look at them and asked if they noticed any differences between the exit pupil circle and the actual viewing, and they said no. After pointing out that the right exit seemed a bit off center they said "Yes, now that you mentioned it, but you can hardly notice it. And the view is great. Your nit picking."So I believe I will be keeping these, unless someone on the forum screams otherwise. I am much relieved, as I thought that the protrussion would be a serious matter.
Steve R. Orion XT12 Fujinon 10x42 Oberwerk 12x60 Garrett Optical 15x70 http://www.telescopesinhistory.com
The photos in post 1 seem to give the tell-tale clue. Umbra take the same photo thru the objecting but center the exit pupil on the objective field. Don't move to where you see the round pupil.
Milton Wilcox R.I.P