Quote Originally Posted by Fast Glass
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Quote Originally Posted by EdN
The F/9 would be for depth of field purposes but it lets in light like an F/5.6 for increased shutter speed.

Yes, you would get a shutter speed of f/5.6 but the noise would be the same as f/9 on a full-frame or f/5.6 noise on a 1.6. The noise would be about the same.
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John


Are you sure about that? The F/9 applies for depth of field equivalent to full frame is an optical measure. Noise is a function of signal processing of the light picked up by the sensor. I don't understand how differing depths of field in a lens affect the signal processing of the light falling on the sensor to affect noise in shots with good exposures.