Size comparison of FE 4/2470 on A7 vs Olympus 12-40 f2.8 on GX7

Started 7 months ago | Discussions thread
blue_skies
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Re: Why compare the larger M43 lens and not the one with the same range?
In reply to Lab D, 7 months ago

Lab D wrote:

Maybe it is what you had on hand. FYI, The Panasonic would be a better lens to compare since it is also only 24-70mm and does not have the optics for a close up lens as the Sony doesn't either. You will find the Panasonic is smaller than the Olympus, but maybe that was not your point.

As for understanding exposure think of lens apertures like this. A fat lady and a thin lady are laying on the beach. Who will get sun burnt faster? Answer: both will burn/tan the same despite the fat lady having 4x the skin area.

You are addressing aperture, not sensor. The fat lady and the thin lady receive the same amount of light rays on each of their skin cells.

But the fat lady has larger skin cells, that can pick up low ray levels easier than the thin lady, so the absorption rate will differ (same amount of light, different noise levels).

In fact, on a 4x sensor, you are two stops apart from one another for similar noise levels. This is like putting sunscreen on the thin lady - she'll never tan as neatly as the fat lady.

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Cheers,
Henry

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