How The Canon PowerShot A2000 IS with 10 megapixels is cheaper than the Canon PowerShot SD850 IS with 8 megapixels?

i really want to know which one is better is that only cause the SD850 IS depends on Lithium batteries??

For picture quality, I think there's too much MP here to work with. Let me explain. I came across an interesting article today about how more mega pixels is not necessarily a good thing. According to Image Engineering – a company that does testing of digital cameras for photo magazines in Germany – the quality of digital pictures has steadily decreased since the state of the art was six megapixels back in 2004. And because they don’t have a “dog in this hunt,” they put forth a compelling argument for buying new digital cameras with less mega pixels and not more.

The argument is essentially this: CCD chips on point and shoot cameras a smaller and as such, fitting in more pixels causes them to lose light sensivity. Sure, there’s more data on the chip, but the chip can’t absorb the light data and what it ends up with is a picture that has more noise than image quality. In addition, the more megapixels a camera has, the larger the lens it needs to provide the clarity it deserves and prevent diffraction due to a loss of detail with smaller apertures. But since we’re talking portable point and shoots here, those large lenses simply aren’t being made.

Finally, with larger mega pixels comes longer saving time due to their requires huge storage capacity, or more compression if not storing images in RAW format. The result is a noisier image and a dissatisfied camera user who thirsts for high quality and speed but fell into the trap of "more must mean better."

In the end, relying on a smaller MP that can balance all these needs may indeed be a better answer.

And remember that the Lithium battery means it's more compact and lighter, which can be of advantage when traveling, hiking, etc.

thank u so much for all these infor that was so useful for me i guess i made my choice already now:)

Hi there... For me the extra megapixels sometimes are worth since I use to take pictures from my kid on landscapes and sometime I notice that his face on one of the pictures is really nice so I can "cut it" to have only his face without lossing resolution... It also works when taking lots of pictures on a day out and later I come home and edit some pictures... It is nice having the extra megapixels in order to avoid quality decreasement on the final edited pictures. Anyway over 8 megapixels will be nice enough to cut a large part of the pictures...