Originally Posted by
Arash
You seem to all have accepted this false perception that a 36mp fullframe sensor has the same resolution as a 4x5 film. I am a kid who started photography with DSLRs and can't even decide where to start with Digital specific problems.
first of all, that 36mp sony sensor inside of a Nikon or Sony camera has a VERY high sensor aperture. 7360 photosites spread across 36mm. That's 7360/2/36= 102, let's repeat it in our heads again, hundred two line pairs per millimeter. Nikon is a good glass maker no doubt but still i would like to see ONE SINGLE nikon lens that can reproduce any acceptable contrast at that high of a resolution.
Oh wait a moment, that calculation is only valid if the photosites on the sensor are stacked one to one together without any wasted space between them. since in reality they do have circuits on the sensor the photosites are even tinier and more spread, requiring an even higher resolution lens.
Oh wait a moment, all this calculations were valid if the sensor was Black and White. Since these sensors are all Bayer patterned even with an IDEAL LENS which can resolve the required 200lp/mm they wouldn't output a 36mp picture.
On a Nikon D800 36mp Sensor YOU DO NOT HAVE STRAIGHT VERTICAL AND HORIZONTAL LINES AT ANY GIVEN WAVELENGHT. the closest they come is to making one straight horizontal OR vertical green line and THAT IS IT, ONE straight line instead of the required 6(required for reproduction of circular color patterns).
And now let's forget how much data we are losing while doing all the debayering and color guess game and hundreds of different processes that are going on at the same time inside of a digital camera to output a picture.
Ok so what about film? 4x5 inches, a good normal Large format lens has good contrast reproduction ratios at 40lp/mm and film responses fantastically to that. That is 40*2*120= 9600 and 40*2*100= 8000.
9600*8000= 76.8 Million.
That's 76 million output real RGB pixels, a Digital sensor that wants to match that has to have 3 photosites on the sensor for every output pixel, which means an RGB 230 megapixel sensor that would output a 76mp image.
So until the industry has made a much larger sensor that has over 200mp photosites on it, no digital is not equal to 4x5 inch film, even in resolution, let's forget the color, let's forget the 8x10.
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