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..And what is the difference between Zoom and Aperture Angle in the game..?
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Actually, no real one. In real life optics, the higher the magnification, the lower the aperture (field of view). The main purpose in the game is probably just to calibrate acurately the appearance of the optics. But it won't matter if you use for example an aperture of 7.5 º (Which is more or less what a 7x zoom gives you) or a higher aperture w¡ith the 7x zoom.
What matters is that, once you have decided which size you want the image to have in the screen (I mean the window in which the image seen through the optics is rendered, which doesn't always cover the whole screen), you can first set the zoom level and later adjust the aperture angle to calibrate ita ccurately for the one it should have.
Sorry, it's a bit difficult to explain, but I hope you get it. Set the zoom first, and then tweak the aperture until you see in the window as many degrees as you should expect (F.e. Zeiss 7x50 Uboat binoculars had a field of view of 125 metres @ 1000 metres distance. Put a 125 metres long ship at 1000 metres from you with the mission editor, and check that it covers exactly the whole lense)
Hope that helps