How do I convert focal length from mm to pixels?
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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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Respuestas (2)
bym
el 2 de Jul. de 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)
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bym
el 5 de Jul. de 2011
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
el 5 de Jul. de 2011
here is the web site http://www.dpreview.com/learn/?/key=sensor%20sizes
looks like you should be using 6.16 mm
George Abrahams
el 23 de En. de 2024
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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