--- "Austin, Joe" <[EMAIL PROTECTED]> wrote:
<snip>
> Does anyone know where I could get such an item, or
Steven Gandy's CameraQuest website offers adapters to
do all kinds of strange things, among which Nikon lens
to EOS body is one:
http://cameraquest.com/inventor.htm
This of course causes all functions of the Nikon lens
to be manual, ie, you must focus manually, meter
stopped down, and you lose the auto diaphragm.
I think there is a generic Bower adapter that allows
the use of Nikon optics on EOS, you should be able to
order that one at a local camera shop.
> even better, one that does allow at least aperture
>indexing with the N-C matchup.
Communication between Canon EOS lenses and bodies is
completely electronic, there is a proprietary serial
protocol implemented over a bunch of contacts on the
backs of the lenses. The aperture is opened an closed
in an EOS EF lens by a solenoid.
Nikon lenses (at least up to the latest G series
units) have a lever on back which actuates the auto
diaphragm mechanism (stops down the lens to the taking
aperture when the shutter is open, to allow full
aperture viewing and focus). Nikon has had at least 3
mechanical schemes I know of to couple the aperture
ring to the built-in meter.
Neither of these mechanical linkages exists on an EOS
body. I think it's doubtful that anyone could build an
adapter economically that would have the translation
hardware to convert the electrical signals to
mechanical movements and vice versa... it would likely
be very unwieldly, need a microprocessor and perhaps
require its own source of power.
For the later AF Nikkors with built-in focus motors,
it has to be POSSIBLE to build an adapter that would
maintain all of the lenses automatic functions, but
the results probably would not be very practical.
As a consolation, both manufacturers make really great
lenses. To paraphrase an old saying, Nikon is Nikon
and Canon is Canon and never the twain shall meet?
MadMat
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