A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
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Great Bustard
Great Bustard OP Forum Pro • Posts: 32,723

Anders W wrote:

So if you are comparing a 25 mm and 50 mm lens on MFT, which comparison would you find more interesting. A comparison at the same f-stop or a comparison at the same absolute aperture?

It depends on the point of the comparison.  I would compare 25mm f/1.4 on mFT to 50mm f/1.4 on FF if I was interested in the shallowest DOF I could get at that AOV and/or the least amount of noise I could get.

On the other hand, if I were looking for overall sharpness, I'd compare the 25 / 1.4 on mFT at its sharpest aperture to the 50 / 1.4 at its sharpest aperture.

However, if I were looking for overall sharpness in a light limited scene then I'd compare 25 / 1.4 on mFT to 50mm f/2.8 on FF.

In other words, Equivalent settings are simply the starting point for a comparison -- we generally don't choose one system over another based on where they are most similar, but based on where they are most different.

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