How do I convert focal length from mm to pixels?

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Amr
Amr on 2 Jul 2011
Hello,
I used the Exif data to determine the focal length of an image. and i get it with measure unit (mm) and in need to convert it to pixels
How do I convert focal length from mm to pixels??

Answers (1)

bym
bym on 2 Jul 2011
Does the Exif data contain the CCD width information? If so, use: focal length in pixels = (image width in pixels) * (focal length in mm) / (CCD width in mm)
  3 Comments
bym
bym on 5 Jul 2011
here is the web site http://www.dpreview.com/learn/?/key=sensor%20sizes
looks like you should be using 6.16 mm

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