How do I convert focal length from mm to pixels?

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Amr
Amr 2011-7-2
回答： George Abrahams 2024-1-23
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??

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回答（2 个）

bym
bym 2011-7-2
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)
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bym
bym 2011-7-5
no, that is actually an aspect ratio. I saw a web site that actually gave common ccd sizes. I'll try to find it again a post link here
bym
bym 2011-7-5
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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George Abrahams
George Abrahams 2024-1-23
Let F be the focal length in mm, be the focal length in pixels, and be the pixel size in mm.
Then, and .
The values for should be available in, or derivable from, the camera's technical specifications.

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