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Convert Digital Camera Zoom to Binocular Power

Updated on September 9, 2014

An explanation and how to convert

The pictured digital camera was purchased because it has a 7x zoom, which I thought made it as powerful as my binoculars. In reality it did not seem to magnify like my binoculars. Now I know why.

The 7x is the result of dividing the small focal length number into the large focal length number giving what I think is meaningless result. In the case of the Nikon 6100 5 divided into 35 results in 7. (what the 5 and 35 actually represent is a whole other story)

To roughly convert to magnification like we know it divide the focal length by 50 and multiply the result by a brand specific factor. For Nikon and Cannon it is 1.5, for Panasonic 2. So this camera has a large focal length of 35 so 35 divided by 50 times 1.5 equals 1.05. Actual experiments seems to verify a magnification “power” much nearer 1 than 7.

The method described should yield a magnification close to reality but likely is not perfect. The factor described relates to sensor size and I can’t imagine a manufacturer using 1 size sensor in all its cameras.


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