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For lunar and planetary imaging I use the 'exposure bracketing' function on my canon. It takes three pictures which 'bracket' a certain exposure, for example -2, 0, +2. Then combine them in an HDR editing program (or manually in photoshop). The -2 will give you the surface detail of Jupiter, the +2 will give you the moons and the 0 is the base layer for the stack which gives the program something to measure signal against noise.
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