Equivalent focal length for MFT lenses

Started Apr 12, 2013 | Discussions thread
CharlesTokyo Contributing Member • Posts: 721
Re: Equivalent focal length for MFT lenses

draleks wrote:

There is a lot of talk about comparing lenses for MFT with APS or full format lenses. So I want to check if the following comparison is correct. If I have an MFT 300 mm f/6.7 lens, and a full format 600mm f/6.7 lens that is of a worse manufacturing quality and just happens to be twice as soft as the MFT lens. Then, on equal ISO values, those two lenses will be an exact match. Right?

Not exact, but similar.

Think of it this way, a 300mm f6.7 on m43s is like putting a 300mm on your FF camera, but cropping the final image so that the view is the same as it would have been with a 600mm lens. Exposure values are the same f6.7. The difference is in the focal length of the lenses. A short focal length lens gives a bigger depth of field than the a longer focal length. Shooting with a 300mm lens gives more depth of a field than a 600mm lens regardless of the format you are using.

So, no they aren't an exact match. Framing, exposure should be the same. (Well similar at the transmission values of the lenses maybe slightly different as well as camera metering). The difference is that the 300mm on m43s will have the depth of field of a 300mm lens at f6.7 and the 600mm on full frame will have the depth of field of a 600mm lens at f6.7.

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