Kevin Purcell
Well-known member
Why is that? You´d imagine soldiers would have to focus quickly, what with folks trying to kill them and all......
IFs work fine for distant targets which the military is most interested in so you can set the bin at the hyperfocal distance and see everything from closer than that to infinity.
http://en.wikipedia.org/wiki/Hyperfocal_distance
Then you never need to worry about refocusing the bins ... pick them up and scan. What could be quicker. And they never get knocked out of focus either.
Same goes for sailors and anyone else interested in stuff 100m or more away.
If the person is close enough to easily kill you with small arms you don't need optics to see them. The iron sights (or low magnification reflex gun sights these days) work fine.
A secondary effect is the (mostly) young soldiers have a big accommodation range to they can come in even closer by changing their eyes focus. Doesn't work for older farts like me but I find that Yosemites set to the hyperfocal distance I can see "clearly" down to 75m or less. Actually IF Yosemites probably would sell well.
Peter Dunne observed that most birders using field marks to ID birds (i.e. passerines) do so at a range of 40m or less. That's the same as shotgun range with bird shot. Some things haven't changed (except the birds get to fly away).
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