|Dec 2, 2012, 04:24 PM||#1|
iPhone 5 focal length math
So I'm fairly new to photography, and I expect that my math could be a bit off, but I was trying to figure out the focal length (per sensor size) on the iPhone 5 and this is what I came up with.
So the listed focal length in the EXIF data on my iPhone photos is 4.13mm.
I believe I read somewhere that the crop factor of the iPhone sensor on the 4S and the 5 is 7.5 (if this info is wrong it throw off everything else).
So if I'm understanding how the focal length math works, this is essentially the same angle as about 30mm on a full frame sensor or 50mm on a 1.6 crop factor sensor (such as most entry level DSLRs).
Would this be correct? This is mostly just a thought exercise, but would be good information to keep in mind while shooting with my iPhone.
|Dec 3, 2012, 12:00 AM||#2|
the iPhone 5 has a 4.1mm focal length lens with a crop factor of 8.05 totalling a FF field of view of around 33mm, or a 1.6x crop field of view of 20mm
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Last edited by mulo; Dec 3, 2012 at 02:42 PM.
|Dec 3, 2012, 11:03 AM||#4|
Focal length is a property of a lens, and is unaffected by the sensor size. I say this not to be pedantic, but because it's important not to get these types of things confused. Focal length does not change with sensor size. Ever.
The iPhone's camera lens has a focal length of 4.1mm. The field of view of that lens is equivalent to that of a 33mm lens on a full frame camera.
If you don't shoot with a FF camera, then I'm not sure of what value this information is.
http://mfphotography.ca - Street and editorial photography in Toronto, Canada.
|Dec 3, 2012, 06:30 PM||#5|
Right, that's what I was getting at. I was just trying to get a comparison for field of view. Mostly out of curiosity. Thanks.
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