ORIGINAL: Wiaxle
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As for trajectory, the pathagorean will hold true.
Target shooting, at 10/20/30 yards, you are shooting from one point to another, and automatically compensating for the trajectory (arc) of the arrow. This would hold true from an elevated position also, no?
And finally, how can a range finder determine true trajectory lacking the mass and velocity of the projectile? (I suppose you could bring elevation into the mix also which would affect the density of the air)
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The pathagorean is off slightly and I mean SLIGHTLYbecause sight paralax is not compensated for.
Pretty good read on the subject.
http://archersadvantage.com/TipSheets/UpDownHill.htm
You are correct to assume that the range finder does not accurately determing EXACT and TRUE trajectory but from what I understand there is a rifle mode and bow mode on some of these range finders and they use a simple basic standard that is pretty darn close but not exact.