Author Topic: stuck focus on 35/1.4 AI  (Read 2112 times)

Bruno Schroder

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stuck focus on 35/1.4 AI
« on: May 04, 2017, 15:50:55 »
I have a 35/1.4 AI which is now almost completely stuck and almost impossible to focus. I'm tempted to clean it myself. I have not found anything relevant on internet, except a video opening it but not touching the helicoids. I also have, of course, read Richard's advices.

Has any of you already cleaned and regreased the helicoids on that lens? Any specific advice?

Many thanks.
Bruno Schröder

richardHaw

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Re: stuck focus on 35/1.4 AI
« Reply #1 on: May 04, 2017, 15:57:29 »
which 35/1.4 is it? this one? :o :o :o
if it is, send it to me. I will fix it for the blog...

Erik Lund

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Re: stuck focus on 35/1.4 AI
« Reply #2 on: May 04, 2017, 15:59:05 »
Read Richards text on how to do it, and take care about marking etc. when removing the rear group, CRC elements,,,
Erik Lund

richardHaw

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Re: stuck focus on 35/1.4 AI
« Reply #3 on: May 04, 2017, 16:10:15 »
OMG, this has a CRC element!?  :o :o :o

Erik Lund

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Re: stuck focus on 35/1.4 AI
« Reply #4 on: May 04, 2017, 16:25:51 »
OMG, this has a CRC element!?  :o :o :o
What ?
Erik Lund

Bruno Schroder

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Re: stuck focus on 35/1.4 AI
« Reply #5 on: May 04, 2017, 17:21:57 »
Yes, this one
Bruno Schröder

David H. Hartman

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Re: stuck focus on 35/1.4 AI
« Reply #6 on: May 04, 2017, 21:58:13 »
I cleaned a 24/2.8 AI between the aperture blades because they must have been coated excessively and they shed so much photos were foggy looking. I don't remember it being difficult. I ascribed a thin line with a sharp needle for realignment. The complete read group was the CRC. The 35/1.4 might be a milk run. :)

Dave Hartman
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richardHaw

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Re: stuck focus on 35/1.4 AI
« Reply #7 on: May 05, 2017, 02:58:01 »
What ?

Didn't realise that this lens has CRC, i thought the Ai-S was the only one that had it  :o :o :o

Roland Vink

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Re: stuck focus on 35/1.4 AI
« Reply #8 on: May 05, 2017, 04:35:25 »
Nope, all the 35/1.4 versions have CRC (as do all 28/2 and 24/2.8 lenses).
When it was introduced in 1970 it was a very advanced lens, with a modern optical design, floating elements and fully multicoated.

You might be thinking of the 28/2.8, which gained CRC with the AIS version.

richardHaw

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Re: stuck focus on 35/1.4 AI
« Reply #9 on: May 05, 2017, 07:14:42 »
Nope, all the 35/1.4 versions have CRC (as do all 28/2 and 24/2.8 lenses).
When it was introduced in 1970 it was a very advanced lens, with a modern optical design, floating elements and fully multicoated.

You might be thinking of the 28/2.8, which gained CRC with the AIS version.

No, I was thinking about the 35/1.4 :o :o :o

brent_e

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Re: stuck focus on 35/1.4 AI
« Reply #10 on: May 05, 2017, 17:09:05 »
I've got the same lens and opened it up to clean some dust from between some of the rear groups.  that wasn't a big deal, but I was worried so looked for a manual.  I never purchased one, but recently got a note from ebay about a manual still being up for sale.  might be worth it.
just checked...still there.  search for "Nikon Nikkor 35mm F1.4 Ai Lens Service & Repair Manual"

Brent

Bruno Schroder

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Re: stuck focus on 35/1.4 AI
« Reply #11 on: May 23, 2017, 23:29:00 »
I initially though I would take Richard's offer but I haven't (yet) found the way to ship the lens to Japan without having customs duties applied both way. If I can't find a way, I'll try it myself, I guess.

Brent, I purchased the manual. Thanks for the info.

Thank you all for the information.

Bruno Schröder

richardHaw

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Re: stuck focus on 35/1.4 AI
« Reply #12 on: May 24, 2017, 03:51:32 »
I want to see the manual!  :o :o :o

brent_e

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Re: stuck focus on 35/1.4 AI
« Reply #13 on: June 22, 2017, 18:55:28 »
I've opened mine but not got to the helicoids. I just had to clean some dust from around the aperture blades.
it took some effort to drip enough acetone in the tiny hole to loosen up the front ring (drip it in over a few hours every 20 minutes).  If I remember correctly you access the drip hole after you slide the grip off. It was pretty straightforward getting things apart and I'm sure Richard has done a similar lens that you can use as a guide (Thanks for all those, Richard!).  I'm not an expert or anything, but if you don't have to take the CRC elements apart to clean them, don't! 

take photos!!!

Brent 




**** didn't realize I posted the same above....sorry for the duplicate!  bad memory! 
 

richardHaw

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Re: stuck focus on 35/1.4 AI
« Reply #14 on: June 23, 2017, 03:31:15 »
I've opened mine but not got to the helicoids. I just had to clean some dust from around the aperture blades.
it took some effort to drip enough acetone in the tiny hole to loosen up the front ring (drip it in over a few hours every 20 minutes).  If I remember correctly you access the drip hole after you slide the grip off. It was pretty straightforward getting things apart and I'm sure Richard has done a similar lens that you can use as a guide (Thanks for all those, Richard!).  I'm not an expert or anything, but if you don't have to take the CRC elements apart to clean them, don't! 

take photos!!!

Brent

Thanks, Brent!

The CRC can confuse people who aren't used to things like this. getting the orientation wrong can lead to a wrong result. I spent many many hours on my CRC 105/2.8 Ai-S because I took my notes with the lens in the wrong orientation!  :o :o :o