High–Low ISO Blending
Consider a low light scene in which you have plenty of static fine detail that calls for a slow exposure that will be relatively noise free, but at the same time there is some movement that you would also like to capture.
The dilemma is whether to choose a low ISO setting and put up with motion blur in parts of the photograph, or a high ISO setting which will capture the movement, but increase the noise. Remember from what we’ve seen of the different causes of noise that dark or fixed pattern noise is much easier to reduce than readout noise at a high ISO.
Well, there is a way of having the best of both worlds, although it takes time, requires a tripod, and works only in certain circumstances. The principle is to make two ...
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