If more MP = poor high ISO performance, can I just shoot with less than max MP?

Started Sep 19, 2011 | Discussions thread
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nathanleebush
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If more MP = poor high ISO performance, can I just shoot with less than max MP?
Sep 19, 2011

I'm really excited about the NEX-7 as an inconspicous take-everywhere camera, but was slightly annoyed by the relatively large Megapixel count.

While I don't really understand the physics behind the less MP = better high ISO performance, I'll take what pretty much everyone says at face value and assume it's true.

So my question is: since cameras have low, medium and high image sizes (i.e. megapixel counts), would high ISO/low-light performance be improved if one uses the medium or small option?

I guess the main problem is that RAW files are always at full resolution, but I'm wondering if with jpegs low light performance would be improved on the same camera with the same sensor.

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