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Posts: 9,183
Registered: ‎08-13-2015

Re: Does an EF-S lens' focal length have the 1.6 crop factor already calculated?

Okay, thanks.  I'm just a part-time math guru.

 

FYI, I've found a formula to convert focal length to FOV.  The formula that it implements is FOV = 2 arctan (x / (2 f)), where x is the diagonal dimension of the sensor. The FOV is measured across the sensor's diagonal, and is therefore smaller across the horizonal dimension, and even smaller across the vertical dimension.

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"Doctor told me to get out and walk, so I bought a Canon."
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Posts: 12,237
Registered: ‎12-07-2012

Re: Does an EF-S lens' focal length have the 1.6 crop factor already calculated?

It's not that hard.  Just remember 46 is normal.  Anything below is WA and anything above is tele.

EOS 1DX and 1D Mk IV and several lenses!
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