I've come at this two different ways, Daniel.
We think of a "normal" or 1X lens as in the 50-55mm range. That would
mean a lens in the range of 100mm would be 2X, 200mm a 4X etc.
I have also observed that an 8X pair of binoculars I used to own was very
similar in magnification to a 400mm lens I also used to own.
Gregg
How many mm of lens is the equivalent of 1x power binoculars and so on?
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