by Harry Moto » Wed Jan 25, 2012 3:28 am
Something you don't see mentioned much in cheapy camera's (cell phones, point and shoot) is pixel density. On the CCD, if you have 16 megapixels that is cool, but if they are in a CCD that's 1mm x .7mm you'll never get crispy images. The expensive DSLR often has fewer megapixels, but the CCD is 16mm x 24mm (from memory, it's something like that) so that the image from the lens can be a LOT bigger on the CCD. There's a limit to how clear an image can be, and it's related to sending the light through lens's and how big the image ends up. Back in the days of film cameras, many pro photo guys would use large format systems with a negative measuring 100 x 150mm (or even 200 x 300mm) to capture that perfect image. We use a CCD instead of a negative, but the size thing still relates. I'm hacking the explanation totally, hopefully you see what I mean.
And if I didn't make ANY sense (not uncommon) check out
http://www.dpreview.com/news/2008/7/3/pixeldensity
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