f-number equivalent between m43 and FF

Started Mar 25, 2014 | Discussions thread
dwalby Veteran Member • Posts: 5,715
Re: f-number equivalent between m43 and FF

Allan Olesen wrote:

dwalby wrote:

I agree its all about sensor area, but I'm not sure I agree with your example.

In the case of two sensors of different size, but with the same size pixel, you have the same SNR for each pixel, we all agree on that.


Where I don't necessarily agree with you is that the simple act of printing the pixel larger or smaller will have any effect on its SNR.

I have never claimed that.

I have claimed that it will have an effect on the visibility of the noise.

And instead of writing all those words, do a simple experiment:

Take a photo of a blue sky. Zoom in to 100% and notice the noise. Then zoom in to 200% and notice the noise getting much more visible.

Same pixels, same noise per pixel, just magnified more. Result: More visible noise.

OK, so we're in agreement. I'm at work, writing words kills time waiting for simulations to finish, so its no big deal.  In my prior post I suggested that what you meant was 'visibility' of the noise, not the mathematical measurement of the noise, so thanks for confirming that.

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