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The 3 identical, cross-posted threads you started in 3 separate forums have now been merged into 1 thread.
Nikon's lens mount is essentially unchanged since 1959.
Most camera makers changed their design of their lens mounts in the late 1980's to accommodate auto focus. Nikon and Pentax are the only that didn't.
Canon's EF lens mount appeared in 1987 as their EOS system. EOS eliminated all camera to lens mechanical connections. None of Canon's EOS cameras have had an auto focus motor in the camera since the EOS intro in 1987.
Canon's EF-S lens mount appeared in 2003. Canon's entry-level DSLR's can use both EF and EF-S lenses. Canon EF-S lenses will not mount on Canon EF camera bodies. EF-S lenses are designed to project the smaller image circle Canon crop sensor (APS-C size) cameras use.
In 2006, Nikon introduced a camera, the D40, that was designed to appeal to women. A major design criteria target to increase d-SLR appeal to women was to make the camera compact and lightweight. To that goal, Nikon eliminates the auto focus motor and screw dive mechanism in their compact, entry-level cameras - D40, D40x, D60, D3000, D3100, D3200, D5000, D5100, and D5200.
Nikon introduced lenses having an auto focus motor in the lens in 1996. Nikon lenses that have an auto focus motor in them are designated AF-S, or AF-I lenses. AF-S/AF-I lenses have the same mount as other Nikon lenses that do not have a focus motor in the lens (AF and AF-D).
Canon EF-S is equivelent to Nikon's DX (for crop sensor cameras) and Canon's EF is equivelent to Nikon's FX (for full frame cameras). However, Nikon's DX lenses will mount and fully function on Nikon's FX camera bodies, though the APS-C size image circle the DX lenses produce may not fully illuminate an FX (full size), size sensor.
I was wondering...if you buy a camera from a different company then the one you practiced on, wouldn't you have to learn about it? Wouldn't those would be clients have to wait until you educated yourself about the camera? Just wondering...![]()