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"25mm F2.8 Lense", Equivalent To 50mm In 35mm Format

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#1 pzsharp



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Posted 11 August 2012 - 01:11 PM

"25mm f2.8 lense", Equivalent to 50mm in 35mm format. What does this mean when the focal length doubles in 35mm format? any help?

#2 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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