As I recall.....
As with apertures, the doubling is not linear, so to speak. Just as the
2-doubling "difference" between f/1 and f/2 is f/1.4, the math for focal
length goes:
1.4 x 100 = 140mm
What do I win?
From: "AG Schnozz" <agschnozz@xxxxxxxxx>
Quiz:
What focal length is effectively half-way between 100mm and
200mm?
AG-Schnozz
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