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Originally Posted by tater
Does the observation scope have a larger objective, but the same magnification in RL? Light gathering is a function of objective diameter (so is angular resolution, actually).
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I believe so - in the manual cited at the link above, the scope which appears to be an attack scope (designated
91KA40T/1.414HA ) is listed as having an "outer diameter of reduced section" (I think that meants the very top/tip of the scope) of 1.414 inches, whereas the scope which appears to be an obs/night scope (designated
93KN36) is listed as having an "Minimum outer diameter of taper section" (which, again, I believe means the very tip/top of the scope shaft) of 3.75", but it lists both scopes having the same 1.5X/6X magnifications, which I take to mean that the night scope uses a bigger opening rather than a lower magnification in order to achieve the better light-gathering capability for night use.