In tachometric surveying, the multiplying constant (K) and additive constant (C) for a standard stadia tachometer with an anallactic lens are:
AK = 100, C = 0
BK = 0, C = 100
CK = 100, C = 0.3 m
DK = 50, C = 0
Explanation
An anallactic lens (fitted inside telescope) eliminates the additive constant C (making C = 0) and maintains multiplying constant K = f/i = 100.

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