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Yes you are. Most DSLRs have relatively small pixels so I don't think you are really going to see any difference unless you are imaging beyond 1500mm.
Other considerations limit DSLRs before pixel size is much of an issue. Colour Noise, well depth, low QE, they pick up light pollution more easily than CCD. It sounds like I am bagging DSLRs - I'm not as they are a lot of fun. But they do have their limitations for imaging deep sky.
The main gain of CCD over DSLR is the fact that the mono chip has every pixel count and usually at about double the QE of a DSLR unless you have one of the few high QE DSLRs (Nikon D800, Nikon D5200, some Canon 1D series).
Mono converted DSLRs seem exciting but they will need filters but Jim Chung is selling converted Nikon D90 and D5100 (that would be the one to get that uses the awesome Sony Exmor 16mp sensor).
They are under $700.
Greg.
Greg.
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