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

Started Feb 6, 2014 | Discussions thread
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socode Regular Member • Posts: 356
Re: Ladies? - use of anthropomorphic language ...

quezra wrote:

Even without measuring instruments, I can very clearly see that I do not get double the light stopping down from f1.4 to f1.2 with either of my Canon lenses when on a digital sensor.

You wouldn't expect to - f/1.4 to f/1.2 is 2/3 of a stop.

It could be that I'm only getting 1/2 a stop instead of 2/3, but the exposure certainly changes with either a 1/3 or 2/3 increase in auto ISO, it's hard to tell since you won't be quantised on an exact 1/3 of a stop when you open it up (and TBH I don't really care if the gain is less than expected as long as it's still significant).

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