You have some research to do. Read up on aperture and focal length as they relate to depth of field. Also how aperture affects speed.
As far as compatibility, I can only speak to Nikon - all Nikon lenses will physically mount to all Nikon cameras however depending on the body and the lens autofocus may not work and with older lenses you may only be able to use them in M and A metering modes. We're talking pretty old lenses here for the metering incompatibilities though so you're not likely to encounter this. If you buy one of the higher end Nikon bodies that has an internal focusing motor (like my D200
) then AF will work on all AF lenses.

Originally Posted by
shroom
bumping this cause im in the same type of situation. i've read through all the old threads on here and some on FM and a few others in the past few weeks, trying to figure out the best route to go. i think i want to stick with nikon/canon duopoly, just for ease of acquiring lenses. that being said, i have no knowledge whatsoever in terms of lens compatibility from model to model. also, im failing to connect the dots between lens size (i dont know the right term here) and speed, DOF, etc.
fps has been what im basing my choices off of so far, and im getting the feeling a 18-55 kit lens isnt fast enough to capture something moving like a skier, am i right with this thought?
with that out there, im torn between something older and used (20d), or if i am better off going with with one of the newer kits that'll do video(t1i).
are there lens compatibility issues or anything else that should weigh in on this decision?
thanks
...Some will fall in love with life and drink it from a fountain that is pouring like an avalanche coming down the mountain...
"I enjoy skinny skiing, bullfights on acid..." - Lacy Underalls
The problems we face will not be solved by the minds that created them.
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