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My understanding (and I'm a bit of a noob in a similar situation) is that you can either get a bigger barlow, but the best results are had with cameras that have smaller sensors to start with, thus magnifying the image. A lot of people use webcams to great effect, but you have to buy the correct ones so you can manipulate the exposure.
A full sensor DSLR is never going to give you serious planetary photos. They're more for wider field stuff.
Cheers
Markus
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