moz wrote:gstark wrote:but you lose some functionality. Perhaps AF, perhaps metering.
I'm curious about this. How come the lens loses metering? That other brand just loses aperture control but TTL metering continues to work. Surely the light still comes through the lens and hits the exposure sensors?
Wot Steve sed.
In the late 80's Nikon introduced it's AF stuff, and with that (or about that time) they introduced electronics, still using though the same ole' F-Mount.
Before electronics, metering information was carried mechanically, originally through the rabbits ears that Nikonfan referred to, and then (we're talking early 70's now) through the
AI ring at the base of the lens.
The D70 doesn't carry any
AI coupling mechanism, but the the D2x/D2h//D200 all do, so they will also know what the current selected aperture setting is.
With the post late-80's lenses, the aperture setting details are passed electronically, and for non-G lenses, you always set your lens to its maximum aperture, and allow the electronics to strut their stuff.
That's why a G series lens (a relatively new concept) can work on a 801 or similar vintage (16 or so years old) camera: they're always set to maximum aperture in terms of this discussion.
Does that help?