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Originally Posted by acropolite
Noise levels of an exposure at a given ISO of say 1/250th of a second does not vary with aperture. It will vary with temperature but whether it's taken with a 150mm lens, a 50mm lens the noise level will still be the same. If it did vary there would be no point in dark frame subtraction.
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This reference was made for signal, as more signal is built up faster than with a smaller lens. You read it out of context. The image of a 150mm lens will produce a faster image than a 60mm of the same folcal length, as the f ratio is much smaller.