If you're going to be taking piccies of planets and such with those scopes, go with the 6" dob. The others will be next to useless. You'll get a lot more use out of the dob, both visually and for piccies. But, as I mentioned earlier, it will only be good for planets, the moon, and some of the relatively bright DSO's. Most galaxies and nebs will be outside of its capabilities. Not because you can't see them through your scope, but the mount is not the right type of mount to track those objects for the time it takes to be able to snap the pics.
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