It's part of the problem that Nikon didn't change the F mount when they switched over to AF. This is a good things but as needs arise they have to change the way lens and body interface. Including all of the interfaces would be too expensive so the lesser model only have the lasted interface. For example the lower end Nikon DSLR don't have the AI coupling so they can't meter with AI lenses but also they don't have the coupling to drive the lens for AF so the lens has to have built in motor and the N2020 did have the coupling to drive the lens for AF but not the electrical interface neccesary to use lenses with built in motor. Canon changed the entire lens mount in one scoop which made many of its customers mad but in the end it was a good decision.
Originally Posted by waynecrider