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Hi Raymo. The meaning of the ISO speed rating of a camera is largely up to it's maker and it can be defined in a number of ways, so there is no reliable way to directly relate ISO to CCD capability.
If you haven't already done it, maybe choose a bright astro object from the book and take some images of it yourself at different exposures with your DSLR system. Compare your results with the book image and then you will have at least a rough idea of how an exposure time given in the book relates to your requirements.
As others have pointed out, a cooled CCD will give better results (in a shorter time too) than a DSLR. If you decide to go that way, a cooled colour camera may be a good place to start, rather than jump straight in the deep end of a mono camera + filter wheel and heavy duty processing. And of course you will need a fairly good tracking mount whatever you do, but I guess that you probably have that already.
Last edited by Shiraz; 20-11-2013 at 08:09 AM.
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