Phantom 631 Posted June 11, 2012 Report Share Posted June 11, 2012 Range finding can be done accurately as long as the scope is at the appropriate magnification When you have your scope at 3x you have a very wide field of view, and just like a camera lense when it's at wide angle, everything is sharply in focus even with a wide apature. This effect is called Depth of field. However the longer the camera lense or higher magnification in the terms of a scope the Depth of Field is reduced dramatically. I'm sure you've seen the photographs of something like a close up of a footballer where the player and the ball is perfectly focused and the players behind and in front are out of focus? Thats taken with a long lense (high mag). A genuine Rangefinder scope will let you focus on an object at 10x or 12 or what ever magnification its designed to used at. For example; If the target is at 45 yards, you will focus the scope at 10x etc and then you look at the scale and read the off the scale. Tony Quote Link to post
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