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SNR - signal to noise ratio. While there are many forms of noise, the camera produces something that looks like film grain, or "snow" from an old analogue TV. Every different sub we take has the same signal but the noise changes. If we average lots of frames we are left with signal (the pic we want) while the noise is subdued from the averaging process.
Stacking the same frame would stack the same noise as well as the same signal so there is no gain in SNR. That's why I bought the K-5, it has better SNR than my old K-x.
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