A quick day out with the Olympus E-M1 and the SONY a7

Started Jan 27, 2014 | Discussions thread
forpetessake Veteran Member • Posts: 4,892
the earth is flat -- not again!

William Porter wrote:

Daniel Wee wrote:

As I only have the Carl Zeiss 35mm F2.8 on hand, I decided to use the Olympus 17mm F1.8 as a way to bring the match closer. I am aware that as far as depth of field is concerned, the Olympus translates to F3.6 in 35mm terms. Be that as it may, that was the fastest 17mm lens we can readily get so that's what I tested.

Reasonable. I've done much the same thing in my own comparison between the E-M1 and the Sony A850.

Small quibble. Aperture "equivalence" is not a useful concept. The aperture of the Olympus 17 f1.8 doesn't "translate" to anything. With respect to the aperture's most important job — controlling the amount of light that gets to the sensor — f1.7 = f1.7, plain and simple, and it doesn't matter what system the lens was built for.

Here we're going again. Of course, the equivalence is useful, it tells you exactly how the two different formats are related. The Olympus 17mm f/1.8 is equivalent to 34mm f/3.6 in FF in every aspect, and that's what one would observe in real life shooting.

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