Originally posted by colonel00 Since its the answer to the ultimate question of life, the universe and everything...I'm gong with 42
I thought it was 39....
---------- Post added 01-02-16 at 04:12 PM ----------
Originally posted by bxf But doesn't this translate to "bigger sensor... does"? In other words, a bigger sensor can accommodate more pixels of a given size, or, each of a given number of pixels can be larger if the sensor area is larger.
Only if you take a different picture. If you stop down your bigger sensor one stop to create the same picture you are going to create with the small sensor, you have twice the intensity in the small sensor on half the size. To take the same image, total light is the same.
This image was taken with a sense on a bridge camera, that's half the size of an APS_c sensor. It doesn't matter whether you shoot APS-c or 36mil. If you shoot the same DoF, you use the same amount of light to get the same image. And same total light means same signal to noise.
The light intensity in the Lumix is 4x that of the intensity on the FF image. The APS-c image is taken with 2x the light of the FF image. What the FF enables you to do, is to shoot for 4 times less DoF than the Lumix or 2x less DoF than APS-c at it's widest setting.
36mm sensors often have better AF and can have smoother out of focus areas at 50mm and less, but between those two things and the above, that's pretty much it. It hs just as much detail as a K-3 or 24 MP 36mm camera would have, and the same DoF (pretty impressive given that it's a 20MP sensor, but it's newer technology.) . Notice the soft areas in the orange area under the bill of the bird. It could have used a little more DoF. You couldn't have improved this image at all, using APS-c or 36mm of the same MP. Same image, same total light. That's what the theory of equivalence really means.
IN this case and this case only, (there are other cases to be considered when selecting camera equipment), using more total light on a 36mm sensor, would have produced less depth of field and a less pleasing image. Everything affects everything else. it's never as simple as some people make it out to be.