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what does the megapixel in dslr cameras?

I am wondering what the megapixel ratings on digital cameras mean, and how important is it, does it have something about size of your picture and how easy it is to get automatic focus with camera. also just how good are the pop up flashes, and how far will you be able to shoot a good picture, say at night if able to focus with camera. need help please.

unless you need more megapixels, you can basically ignore the mp rating.

megapixels only determine how large the picture is. If you are doing massive prints, or doing a lot of cropping, then you can look at cameras with more mp. MP does not measure quality, only size. Quality lies with the sensor and the lens.

as for the popup flashes, they are good for a quick snapshot of people who want their photo taken, but it stops there. For sports, it is practically useless.

Fujifilm FinePix S1800 12.2 MP Digital Camera