pupil dilation changes the depth of focus (makes it shallower) butOctober 8 2011 at 10:10 AM
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Response to Re: POI shift revisited-long
doesn't change the POA. this is related to what people see when focusing and trying to rangefind in a dark situation, as opposed to a bright target. bright target gives you smaller pupils and that gives you a shallower depth of field--that means that your target appears to be "in focus" at a greater range of distance (say 30-38 yards) rather than a shorter range of distance (say 30-34 yards) in a brighter situation.
giant spotlights would help rangefind. they're not prohibited, but would be an example of bad sportsmanship