YellowBullet
Senior Member
Sure. There's tons of things that influence noise, not just the sensor size.Well you've only talked about the signal, you haven't mentioned
where the noise is coming from. And you can't just say "same sensor
technology" because factors like heat, chip size, number of pixels,
etc have direct bearing on the noise.
And you've completely ignored the impact of in-camera processing.
Yes, even RAW pics are processed. You are not getting a direct
sensor read out in a RAW image, you're getting per-pixel luminosity
after whatever processing Canon or Nikon have put between the
sensor and the CF card.
If you're going to be talking about actual prints you can't ignore
those sorts of things.
That's why Canon's 1.6 crop cameras have less noise than Nikon's 1.5 crop cameras, even though Nikon's sensors are a bit larger. Better technology.
I never ignored those other factors. But if you want to compare the effect a sensor size has on the noise, you have to assume that EVERYTHING ELSE IS EQUAL. Otherwise it makes no sense.
So let me repeat myself for the 100th time: everything else being equal, FF sensor will have a 1 1/3 stops lower noise than a crop sensor.
Yes, there's many other factors that influence noise. But we're talking about 1 1/3 stops inerent noise advantage here. The technology better be amazing in the crop camera if it wants to overcome that.
5D has 1 1/3 stops better noise performance than 20D (already amazingly low noise camera) when delivering same print size and same detail. I'm sure most of that advantage comes from the sensor size, but of course there must be other factors that cancel themselves out.