Susan,
I'm not a great resource for this infomation. However, my general impression is that a 3.5 - 4 megapixel camera can do the job pretty well. I also think you can get this range of camera fairly cheaply. As far as features, I just hope they give the creative control that my film camera does. I will probably do a flurry of investigation when I am ready to go to digital.
Personally, when I use a photograph, I will produce an 8x10 image and work from it. Enlarging to 8x10 for photo reference work is not really a problem unless you begin with a high speed film -800 or faster. Then it could get a little grainy. But that's film, I don't even know how film speeds translate to digital yet.
Marvin,
I like to say that I am not picky, I am always satisfied with the very best. Maybe that camera back is for creating billboards on the highway.
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Mike McCarty
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