Quote:
Originally Posted by hcs53
Is it possible to calculatie THE range and AOB with THE scope Markingens of TMO 2.5 only?
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No.
The stock game/TMO/RFB etc. have telemeter divisions that are not "scaled" to accurately measure a thing. To get an accurate measurement, the field-of-view (the width and height of the scope lens view) must be set to a degree width that is in the same scale as the number of telemeter divisions printed on the lens. The number of degrees the lens covers (from left to right, up and down) determines the number of telemeter divisions should be on the scope. It's necessary to know that at 1000 yards distance, one degree of angle covers 52.5 feet in distance. To have the correct and authentic FoV "in scale" with the telemeter divisions, you need to make sure the games view is set to this same measurement. That's what Optical Targeting Correction does. It sync's both scope lens and FoV sizes to the authentic dimensions, and makes sure a tool like the Range Omnimeter works correctly with the two.
Here's a thread that has several images of the
Omnimeter that's in the USS Cod museum. Gino, used to volunteer there and had access to the device. I made a hand held version myself trying it out from the images. None of the images are at a direct perpendicular to the device, so there was just a bit of miss scaling with the calculating. But, really it worked pretty well.
There was one thing I noticed with it though which I found interesting. Take a close look at the triangle
set point of the "Telemeter Scale Reading" slider. Notice the small "tick" mark to the right of the triangle? After, I scaled authentically the game lens, to the game FoV, this additional tick mark produced a better more accurate measurement in finding range than the original triangle mark. I'm assuming the crew found the same thing when they used it. The original mark was placed "off center" a bit from what it should have been (these things were hand made by the engineer crew). So, someone moved the set mark to what they determined was the correct setting for calculating accurate range.
So much for the idea the crews accepted inaccurate range finding as a normal way of making a firing solution!