Andre Labonte Offline Image Upload: Off
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brainiac wrote:
Andre Labonte wrote:
brainiac wrote:
Moleman wrote:
90 5.0 wrote:
I remember when i shot with iso 25,50 and 100 if some one had said one day you will be able to shoot iso 6400 relatively noise free I would have laughed in their face. Technology has change the way we shoot so much....
imagine 10 years from now, or even 5. ISO 58960943942039. Hehe
There is a hard physical limit somewhere, due to photon noise and the Heisenberg Uncertaint Principle, but the coming D3x and 50D, and the existing compact sensors, with their much higher densities, show that we haven't reached that limit yet. Lens diffraction is a more pressing problem to solve.
HMMMM ... considering that at our current resolutions, you need to print at 24"x36" or larger to see the lens diffraction, is it really a problem? Also, diffraction limited optics = theoretically perfect optics ... so it's not likely we will "solve" that issue. 
It's a problem in the sense that although sensors may feasibly reach 240 megapixels (e.g. a full frame sized sensor using the pitch of the Canon G9), there is no point saving all those pixels if the lens makes the files indistinguishable from a 25 or 50 megapixel file. The 1Ds3 is already fairly fussy about lenses and apertures, that is, if you want its detail to exceed that of a 12 megapixel file significantly. As the sensor gets denser, fewer lenses and apertures are going to enable it to deliver full sharpness. The only problem is that all those pixels are wasting disc space and processing resources, if you switch them all on. It may well be possible, though, to use them to extend dynamic range in exchange for lesser detail.
Ah, I see your point and I agree. Fundamental optical laws say that diffraction limited optics = theoretically perfect optics from a resolution standpoint. Therefore, the max MP value of your sensor should be set by the diffraction limit of "perfect lenses" set to the minimum aperature setting where you want max resolution. This is the point of best compromise between resolution and ISO / DR performance. For a 12MP FX sensor, you have to print at ~24x36" to see diffraction effects. 24MP only has 41% more resolution but at a one-stop loss in ISO / DR performance (given current technology) and a 2X cost in storage space.
Personally, I'll take 12MP and the improved ISO performance.
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