ejmartin wrote:
As far as electronic read noise, the 7D is substantially better than the original 5D at both low and high ISO.
If that\'s the case indeed, larger pixels still rule when it comes to noise, no
Note however that the 5D has about two and a half times the sensor area and so for a given Tv/Av will collect that many times more photons
We keep running in circles about this.
Noise is created by the individual pixels, not by the sensor as a whole.
It\'s the SNR of each pixel that determines how much noise there will be in an image.
All things beeing equal, larger pixels have better SNR - and the end result is less noise in the image.
So, if you reduce the resolution of a sensor in order to make the pixels larger, you will have less noise.
Downsizing an image does not imrove noise dramatically (and you lose detail too).
In fact, you need to downsize an image 4x in order to imrove noise 2x.
If you downsize less, the noise is reduced even less (google \'noise reduction by averaging\').
For example, if you dowsize an 18mp image to 12mp, you are only getting 1.22x reduction in noise.
Don\'t understand - why are guys perpetuating the myth that sensor size is what matters, not pixel size.
This is simply not true. Ultimately, the pixel SNR determines the noise.
As technology advances, small pixels could have the SNR of larger pixels from a previus tech generation.
So, it\'s totally possible to create a 1.6x sensor that has the same noise as the 5D classic from four years ago.
For that to happen, though, megapixel increases really need to stop.
Oct 16, 2009 at 11:29 AM
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