"25mm f2.8 lense", Equivalent to 50mm in 35mm format. What does this mean when the focal length doubles in 35mm format? any help?
"25mm F2.8 Lense", Equivalent To 50mm In 35mm Format
Started by pzsharp, Aug 11 2012 01:11 PM
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rjphoto31
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Posted 17 August 2012 - 02:58 PM
Hello. When the lens is listed at being "25mm", this is what the focal length of the lens would be if it was used on a camera with a full frame sensor (or 35mm film). If it says it has a "50mm equivalent, than that means the sensor of your camera 1/2 as big as a full frame sensor, therefore the focal length of the lens "doubles". I am curious what camera you have (micro four thirds?), I know some of those have a 2x crop factor. So it should be the other way around: "50mm for your camera, 25mm equivalent focal length with a full frame sensor/35mm film". Hope this helps.
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