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Hi Ray,
Interesting thread but there needs to be context with who needs a dslr.
As many have pointed, there are limitations with a dslr but with the right knowledge in post processing, you can get good results like the Orion you've pointed out.
The camera itself is only 50%of the equation. Remaining is post processing.
If you look at the sub lengths she used, considerable skill is required to blend them.
Same with a ccd. A colour ccd is extremely easy to use and if you can understand processing to a reasonable degree, you can tease the most out of it without significant struggle.
Astro photography can be as simple or complex as you want it.
I haven't come across anyone pushing one to get a mono ccd, it all depends on ones budget and what they want out of it.
ccd or dslr, each has its limits and intricacies.
The dynamic range with ccd's is hard to achieve with dslr's, the sensitivity to faint targets with a dslr is also limited with the qe being half of a ccd.
I started with a dslr, moved to a one shot colour ccd, and now a mono ccd and would never go back. There are scores of images taken with ccd's that would be extremely hard with a dslr, but again there are some good results.
People Just need to go with what they are comfortable with.
Just my 2c.
Cheers
Alistair
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