Does a larger aperture = Lower ISO setting?

Started Mar 17, 2009 | Discussions thread
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Sprockethead
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Does a larger aperture = Lower ISO setting?
Mar 17, 2009
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In comparing camera performances, I've come across a couple that seem to be similar, but one has a larger aperture, allowing for the lens to be "faster."

One camera has a F2.8 max, and the second camera has a F2.0 max, which technically lets in twice as much light.

Does that mean that I will be using half the ISO setting with the F2.0 aperture? In other words, should I not be comparing ISO performance between these two cameras? Should I compare ISO 100 vs. ISO 200?

I've gotten myself all confused.

Basically, I'm looking for a compact camera that will not be horrendous in low-light situations where there is no flash. Since all compact cameras suck as high ISOs, it seems to me that my only choice is to either leave the shutter open for longer, with a tripod (not an option for me), or get a camera with a wider aperture to let more light in.

Am I right about this?

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