Originally posted by OwlHoot
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How can a full-frame 2.25 Megapixel camera be far more sensitive and expensive than, say, a full-frame 50 Megapixel Canon EOS 5DS, which is on sale for literally a tenth of the price?! 
I mean these days 2.25 Megapixels is completely derisory.
I mean these days 2.25 Megapixels is completely derisory.
Because you need MASSIVE pixels to pick up light when it's very low.
No other sensor manufacturer can make pixels that big.
But to give you a simpler explanation...
Side by Side Comparison: Digital Photography Review
5DS v 5DIII
One is 51Mp, the other 22.
51Mp maxes out at 6400
22Mp maxes at 25600, or 4 stops extra. Bigger pixels mean each pixel can receive more light.
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