Equivalent focal length for MFT lenses

Started Apr 12, 2013 | Discussions thread
OP draleks Forum Member • Posts: 76
Re: Uh, nope

David Kieltyka wrote:

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?

The poorer quality of the 35mm-format lens will reveal itself quite clearly compared to the M43 lens. I've checked this stuff out under real-world conditions.

Now--if you mount the theoretical 600mm lens on the M43 camera via adapter, and the lens just happens to perform great in the center but totally stink towards the corners--you might end up with a useful ultra-long lens for M43 cameras. I own some lenses that perform okay on 35mm but noticeably improve on M43 due to their good center performance.

If what you're getting at is DOF stuff...that's a different subject altogether, and your notion about poor lens quality being an important factor is wrong.


Right, I see what you mean. But what if I mount the MFT lens on an MFT body and the FF lens on an FF body? Will the IQ be compareble then?

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