Hey guys......
I hang out on this site and do a lot of reading but do not interact as much as maybe I should.
I am a fulltime working professional photographer. I thought I would at least contribute to this thread and maybe lend a hand. As far as lenses being interchangeable between brands is quite scarce. Nikon has Nikon mounts and Canon has Canon mounts etc.......... There are specific reasons for this that would take to long to write about on this forum.
And the thing that is starting to happen today in the digital DSLR world is that certain lenses are being made for digital exclusively to deal with the crop factor created by the sensor that captures the image. As an example most of the Nikons DSLR's have a 1.5 magnification factor based on the sensor in the camera. So a 200mm lens on a 1.5 magnification is really a 300mm.
To not get too carried away I would suggest John looking for a nice used Nikon D70s with a lens package on Ebay or the many many other venues out there for used equipment. I am a Nikon shooter so my opinion might be a bit swayed, but I have used a D70 from time to time and feel for what you pay it is a really nice camera. LIke I said, I am a Nikon shooter and my camera bodies are in the $5000 range just for the body alone. So my endorsement of the D70 is a genuine one based on being pretty impressed with what it can do based on what you can pick one up for which is around the money you stated in your thread.
I would be more than glad to help anyone out on this site anytime in regards to camera issues or anything else in regards to photography.
Tim ;-)
www.timschoenborn.com