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

Started Feb 6, 2014 | Discussions thread
Erik Magnuson Forum Pro • Posts: 12,247
Re: Here is a real comparison

viking79 wrote:

I am still wondering why we are comparing a 12-35 or 12-40mm f/2.8 with a 24-70mm f/4, they are very different focal lengths and entrance pupil sizes.

The pragmatic argument is that these two lenses have a very similar FOV range and are high quality fixed aperture zooms.  The two systems (lens+sensor) would also be very similar in results at max aperture in lower light situations: the A7 would have a little over 1/2 stop lower mid-tone noise  for f/4 1/100 @ISO 3200 vs. G7 f/2.8 1/100 @ ISO 1600 (DxO print SNR difference ~1.5 stops - 1 stop for aperture.)   If you matched the DOF and used f/5.6 1/100 @ISO 6400 on the A7, the 1/2 stop would favor the MFT system.

Of course the lens with twice as large of aperture stop is going to be larger.

OSS in the lens is another size factor.

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