Quote:
Originally Posted by blinky
ADC? I thought you don't need one when doing RGB because your only getting light from one color at a time?.
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Because the spectral bands of your R, G & B filters are not narrow, dispersion still operates on the ~100nm band of each mono filter. As dispersion affects blue more than red, if the blue channel is particularly bad and the planet is < ~60deg high, it may well be worth it.
This article gives a lot of good info and data, with an example of the effect on mono imaging of Jupiter. For blue, the effect is 1" at 40deg, quite a bit larger than the resolution of either of our scopes. Another good chart is
here and some miscellaneous discussion
here. My take-away from it is that I'll probably not bother very much, especially this season when the planets are very high, but it's worth keeping in mind to try.