Re: Mounting an old Nikkor-O C 35mm f/2 Auto According to Paul Furman <paul-@-edgehill.net>:
It depends. If it looks like the one in this second URL, *that*
one should mount without problems. Note the small white numbers
partially hidden by the clip (which was designed to couple to the Nikon
F's Photomic meter prisms. However, if it does not have those small
white numbers, and only has the colored aperture numbers which you see
in front of the clip, then it means that it will need to be modified.
In particular, notice that just before it passes behind the clip
from the right, the flange of the aperture ring terminates. The loss of
the flange will continue until it encounters another point which is
hidden behind the curve of the lens body to the left, whereupon it goes
out to full flange diameter again for a very short distance -- probably
about 1/4" or so -- and then reduces again. It is the missing flange
which both allows the lens to mount on the newer cameras, and which
passes information about the lens's setting to the camera body.
In particular, the short (1/4" long) flange tells cameras like
the D70 that the lens is stopped down fully, to allow the body's control
of the aperture to work.
The longer flange (at the top as shown) tells the body how far
the lens is stopped below its wide-open aperture, and this allows the
metering in the body to be used with this lens. I did not check whether
the D200 even has the sensor for the 1/4" long flange (though it
probably does, for proper operation with the autofocus lenses), but it
certainly has that for the longer flange.
Note that the "AUTO" in the lens' name has nothing to do with
with either autofocus nor auto-exposure. It simply means that it has a
diaphragm which automatically stops down from the wide-open (for focus
and compositions) position to the preset aperture for the exposure and
then opens back when the exposure is complete. Earlier lenses did not
have this capability, and you had to either count clicks as you stopped
it down, or (if you were lucky) it had a preset ring, which you could
set for the desired aperture, and a free-turning aperture ring which
would move only as far as allowed by the preset ring. So -- in
comparison with that, it *was* "auto". :-)
Hmm ... how old is this supposed to be? multi-coating is a
relatively recent addition to the world of lenses.
I think that you want a longer lens to be able to stop down to
f/22. I know that I've a collection of larger lenses for a process
camera, and each has the same physical minimum aperture, which the
longer the focal length the higher the f number, so I suspect that
diffraction from the diaphragm edges is the limiting factor. One of the
lenses which I have goes down to f 128, IIRC, but it is rather a long
lens.
The AI modification is what is needed to allow it to mount on
your camera. Those tabs and removal of the flange on the aperture ring
were called "AI" (Aperture Indexed) -- a way of telling the camera about
the current aperture setting which was cleaner than the half-moon clip
used to talk to the Photomic meter prisms.
Which can be present on lenses with the AI ring, or not --
depending on whether they were expected to be switched between Nikon F
camera bodies and F2 or later.
Not that expensive.
Somewhat more expensive than the rear cap.
O.K. An older one, assuming that it has the genuine Nikon
brand.
Probably does not have the AI aperture ring then, and thus would
need modification.
This is not the one in the second URL which you posted? The
chrome in that image is only the body which you grip when mounting or
unmounting the lens. The black ring at the back is the aperture.
Anyway -- from the difficulty of mounting it on the camera body,
I suspect that it is not the one shown, and that you would need to
modify the aperture ring.
Looking at the Pacific Rim web site:
<http://www.pacificrimcamera.com/>
I don't find any lenses in the 35mm range listed in their list of
replacement AI aperture rings, so you will have to have yours modified
by someone, instead of exchanged.
And I find the 35mm f 1:2 listed in the 1968 _Nikon F,
Nikkormat Handbook of Photograpy_. And even then, the aperture ring is
black, not chrome. And it is certainly pre-AI.
Good Luck,
DoN.
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