Question
I know there are a lot of common misconceptions about megapixels and their actual utility, but does more megapixels mean I can zoom into a macro shot of say an insect and see more details compared to a lower megapixel shot?
Answer
Yes - if you took the same shot using the same lens on two cameras, one with 6 megapixels and one with 12, you would be able to crop the larger image, effectively zooming into the image.
There are a few things to bear in mind:
12 megapixels is not twice the size of 6 megapixels - it's only 41% bigger along each side.
The image quality at the pixel level is not guaranteed to be the same. Essentially more megapixels means more "photosites" in the same physical space, which mean each photosite is not getting as much light and has to be more sensitive. There are also problems with diffraction and chromatic aberration. This might result in lower quality.
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