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: It is very simple

Lab D wrote:

It is very simple. Take a specific lighting situation. If a P&S camera needs F/2.8, a shutter speed of 1/60th, and ISO 400, then your E-M1, A7R, RX10, etc. all can use very similar settings to achieve the same exposure.

But they would have much lower noise in the image.  Otherwise why did you choose ISO 400 vs. ISO 800 for the P&S.

If you decide that you RX10 has " a bgigger sesnor" and try to lower the ISO or rasie the shutter speed, then one of the other 2 setting will need to change accordingly.

Exactly - although the convention is to keep the shutter speed the same and change the aperture.  So if you shot the RX10 @ f/4 1/60th ISO 800, the images would look very similar in both DOF and noise.

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