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Some of it comes down to how tight they can cram the pixels into a small area. The ability to have a full size sensor allows for each pixel to have more data capture because each pixel is bigger. Megapixels alone do not make the sensor good. The pixel density on a full size sensor is not nearly as high as the small sensors. The large sensors just have more area to do the same work.
I have a Canon Proshot Pro1 that is 12 or so years old. It does great at ISO 100 in RAW mode. If I go to ISO 400 the noise makes the picture un-usable. It has a tinly little sensor and is technology from the turn of the century.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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