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You want a fast lens - ideally shoot at f/2 to f/4, ISO 800-1600, for 10-30 secs depending on the focal length of your lens.
I'm using a compact tonight Oanasonic LX5 and expecting to capture both comets in 1 frame using ISO400, 1 minute at f/2 with a wide angle lens (the lens is a Leica Summilux)
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