Author Topic: PC-Nikkor 28mm f3.5 adjustments  (Read 236 times)

Bent Hjarbo

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PC-Nikkor 28mm f3.5 adjustments
« on: November 03, 2020, 08:50:17 »
I have the PC 28mm, but it is very easy going in the shift. It will slide down by itself ::)
Any easy adjustment to avoid this?

richardHaw

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #1 on: November 03, 2020, 10:19:09 »
maybe add some felt at the button (inner surface) :o :o :o

Erik Lund

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #2 on: November 03, 2020, 12:20:24 »
Drawings, first one is the different lubes and second exploded view - I don't think felt is an option, too tight tolerances

I would give A58 some heavy grease ;)
Erik Lund

Bent Hjarbo

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #3 on: November 03, 2020, 12:41:08 »
Erik many thanks for a quick answer :)

Erik Lund

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #4 on: November 03, 2020, 12:52:37 »
You are most welcome, I happen to have the repair manuals for both versions f/3.5 and f/4

The two parts 56 and 57 needs to go closer together - that tightens the swallow tail connection, this is done taking off the mount and the rotating part first.
Erik Lund

bobfriedman

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #5 on: November 03, 2020, 13:37:42 »
thank you for this.. I have a PC-Nikkor 28/3.5
Robert L Friedman, Massachusetts, USA
www.pbase.com/bobfriedman

Bent Hjarbo

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #6 on: November 03, 2020, 15:17:20 »
I did not manage to get the rotating part of, removed a small set screw, but, it did not move.
So for to night it will have to work with some pieces of paper, to make som more friction ::)

richardHaw

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #7 on: November 03, 2020, 15:21:10 »
nikon should have made this adjustable :o :o :o

Matthew Currie

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #8 on: November 07, 2020, 21:34:24 »
I have an older "chrome knob" 35/2.8, and it definitely is adjustable.  At the end of the knob is a little spanner nut, which is a jam nut that adjusts play on the knob.  For mine (which was also loose when I bought it in "bargain" condition) I milled or filed a 4 millimeter 1/4 inch socket into a spanner.

On that one (and it appears similar in the drawing above for yours) if you loosen the spanner nut, then tighten the knob clockwise and then retighten the spanner while holding the knob, it should tighten up.  Because there's a little thread slop to take up here, it may take a couple of tries to get the tension just as you like it.

e.t.a. I note that the knob on the newer lens has a cap on it, which I suspect you must pry off.  Mine is exposed, and the adjustment is pretty obvious. 


mxbianco

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Re: PC-Nikkor 28mm f3.5 adjustments
« Reply #9 on: November 10, 2020, 19:00:42 »
Some years ago I bought all the remaining PC-Nikkor spare parts from a retiring US repair shop. I have knobs, plates, even some lens elements. Most of the boxes/envelopes will have the Nikon part # stamped on. In case anyone needs a hard-to-find part for his/her PC-Nikkor, I might have one. I have more pieces than needed to service my 3 different vintage PC-Nikkors. Including one of the original photos from the Ebay ad.

Ciao from Massimo


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