Re: Spotting scope quality vs air temp
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GG... there is no formula for it.
Next time when you are out on a mirage prone day, take a black paper and some tape.
Cut a nickel sized hole in the middle of it and tape it to the front of the scope so you can lift it up to compare.
Look at a long range target that is in a boil.
Flip down the paper, and what you will see is a sharper target that is dancing.... nothing can make it stop moving, but the smaller opening will make it clearer.
What is actually happening is a long write, and will bore everyone to death... but a classic demonstration of mirage v aperture is the following - take the 80mm scope, and make a paper mask with four nickel sized holes at 12, 3, 6, and 9 o'clock, out by the edge, but still in the light path.
Take the scope out just after sunset and look west at a bright star - you will see 4 starts dancing independently around each other. That should throw some light on the subject. [img]/ubbthreads/images/graemlins/wink.gif[/img] [img]/ubbthreads/images/graemlins/wink.gif[/img]
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I went out and tried this today for curiosity to see if there was a placebo effect or some real difference. one thing for sure FOV is much smaller.
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.