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pupil dilation changes the depth of focus (makes it shallower) but

October 8 2011 at 10:10 AM

bill price in VA  (Login -bp)

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


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On line trajectory calc by Brad Troyer MILDOTS


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