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Message: <blockquote data-quote="bluespiderweb" data-source="post: 3634954" data-attributes="member: 114337">OK, just played around with this, and the BSII's were open slightly more than my measured IPD, so maybe it had some effect on my eyestrain.  But I don't remember having any trouble setting the IPD in any bins before-it is a pretty natural step for me in using binoculars.But, what has always caused me more trouble setting is the diopter, since my left (non-dominant) eye is somewhat worse in vision than my dominant right eye, and most times I pick a spot to set it at a mid distance from my usual focusing points for near and far use, if I have the lighting conditions I need to set it easily.So, I reset the diopter a couple of times (bad lighting-harsh high contrast and then low contrast), and now the setting is more + than before, and it seems to be working for me now-no eystrain to speak of, other than typical allergy symptoms that work against viewing through binoculars any day.  But maybe the diopter setting was the problem in the first place?  I remember looking through them, and then taking them away, and getting that strange feeling like the collimation was off-so could that be down to the diopter setting moreso than the ipd setting?</blockquote>