Fraser
Well-known
Does it line up perfectly at infinity?
Re: W-Nikkor 3.5cm F1.8
- Thread starter nomadia
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enasniearth
Well-known
I notice jons lens has the screw holding the coupling ring at about the 7 meter mark on the distance scale
Yours seems to be close to infinity mark
I looked at mine it's like jons
When the infinity mark is set at reddish dot index , the screw holding the ring is close to 20 feet near 5.6 index on depth of field scale
Looks like your focus ring is off - not assembled correctly
Yours seems to be close to infinity mark
I looked at mine it's like jons
When the infinity mark is set at reddish dot index , the screw holding the ring is close to 20 feet near 5.6 index on depth of field scale
Looks like your focus ring is off - not assembled correctly
Al, I'd say he's got the lens set to near MFD instead of infinity. That would account for the difference.
The sleeve doesn't seem to have any problem. No bumps, it snaps back when pushed to the front of the cell.
Judging by the angle of the part of the spring we can see in your photo, I'd say the spring isn't installed correctly in relation to the screw. It needs to be moved past the screw by one more rung. It a finicky process that requires three hands (seriously!) but doing so would give more tension on the spring action to hold the sleeve firmly against the mount, particularly when the lens is at or near MFD. When installed correctly, it should look almost parallel to the mount like the lenses below.
richardHaw
junk scavenger
i just noticed that now that you mentioned it 😱😱😱
that was definitely worked on by somebody else 🙄
to lift the spring, I use a clip 😎 soldering clips to be exact
that was definitely worked on by somebody else 🙄
to lift the spring, I use a clip 😎 soldering clips to be exact
nomadia
Established
Good to know. Has anyone documented the needed disassembly? Thank you everyone, especially to Jon for zeroing in on the problem.
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Sent from my iPhone using Tapatalk
Re: W-Nikkor 3.5cm F1.8
Re: W-Nikkor 3.5cm F1.8
1. Remove rear optical group. Grab the rearmost metal part with your hand and twist it anti clockwise. It should screw right off.
2. Loosen and remove the flathead screw next to the spring. The sleeve and spring should come right off.
3. Put it all back together properly. With a bit of trial and error you should figure it out pretty quickly.
Re: W-Nikkor 3.5cm F1.8
1. Remove rear optical group. Grab the rearmost metal part with your hand and twist it anti clockwise. It should screw right off.
2. Loosen and remove the flathead screw next to the spring. The sleeve and spring should come right off.
3. Put it all back together properly. With a bit of trial and error you should figure it out pretty quickly.
Peter Jennings
Well-known
It may be easier to only remove the screw and adjust the spring without removing he rear element and coupling ring. At least, I would try that first.
Re: W-Nikkor 3.5cm F1.8
Re: W-Nikkor 3.5cm F1.8
That would be ideal. I was thinking it may help the OP understand the mechanism more clearly by partially disassembling it. Easy enough to do as removing the rear optical group is as simple as removing a filter.
Re: W-Nikkor 3.5cm F1.8
That would be ideal. I was thinking it may help the OP understand the mechanism more clearly by partially disassembling it. Easy enough to do as removing the rear optical group is as simple as removing a filter.
Peter Jennings
Well-known
Sure, Jon. I just thought that if the OP has some trepidation he could try something less invasive. When I first started tinkering with this stuff I'd take off a tiny part and freak out that I might be ruining it. Then I'd see that what I did had no negative effects and next time I'd go a little bit deeper. Pretty soon I was comfortable stripping down cameras and lenses into pieces.
enasniearth
Well-known
Jon
Looking at your photos of your lenses the screw that holds the ring lines with the 7 meter (20 feet ) mark on the distance scale , these rotate together
Looking at the nomadias lens the retaining screw lines up with the infinity mark on his lens
Once again they rotate together / so the focus scale ring is not in the correct position .
Looking at your photos of your lenses the screw that holds the ring lines with the 7 meter (20 feet ) mark on the distance scale , these rotate together
Looking at the nomadias lens the retaining screw lines up with the infinity mark on his lens
Once again they rotate together / so the focus scale ring is not in the correct position .
enasniearth
Well-known
The sleeve doesn't seem to have any problem. No bumps, it snaps back when pushed to the front of the cell.
I took some pictures of my 3.5cm f1.8 and a 2.8cm f3.5
no mater where the focusing is set , the screw location is at 20 feet on the distance scale (they rotate together)
on your lens it lines up closer to infinity . possible that the lens assembly is screwed in one thread off (there are 3 different position the 28 helicoid can be screwed on )and someone moved the distance scale to line up at infinity
Attachments
I stand corrected, Al. Thanks for the additional photos as well. The lens clearly needs more work than just a spring repositioning!
Peter Jennings
Well-known
Looking at your lens, I noticed that the gap between the focus ring and aperture ring (A) is too narrow. Also, the gap between the mount and focus ring (B) is too wide (mine measures 4.4cm). This is likely also related to the coupling ring being misaligned.
[/url]1ba6f55d14169cef6288b73ae1face12 by Peter Jennings, on Flickr[/IMG]
I don't think the fix is that hard. Just remove the three tiny grub screws holding the focus ring in place. No need to remove anything else. With the focus ring loose, grasp the focus ring/mount together in one hand and the coupling ring/rear lens group in the other. Rotate so that the gap between the aperture ring and focus ring widens and the white dots line up at the appropriate f-stop. Also, there should be machined holes under the focus ring for the grub screws lock into. They need to line up with the holes in the focus ring. It may take some trial and error to get there.
I don't think the fix is that hard. Just remove the three tiny grub screws holding the focus ring in place. No need to remove anything else. With the focus ring loose, grasp the focus ring/mount together in one hand and the coupling ring/rear lens group in the other. Rotate so that the gap between the aperture ring and focus ring widens and the white dots line up at the appropriate f-stop. Also, there should be machined holes under the focus ring for the grub screws lock into. They need to line up with the holes in the focus ring. It may take some trial and error to get there.
nomadia
Established
To update this thread, this lens has been sent to Youxin Ye. This was after trying (and repeatedly failing) to put the spring back 🤡. Finnicky is an understatement to say the least. If you're a non-technical person like me, don't even try. Thanks again for the help. I hope this thread will be of great help to those inclined to DIY this lens. Cheers!!!
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Sent from my iPhone using Tapatalk
richardHaw
junk scavenger
this is going to be on my "to write" list 😱😱😱
my next one has to do with Nikon's 100th anniversary so probably in august 🙄
when I do not have the clip, I use my mouth to push the spring up while I install the screw 😎
my next one has to do with Nikon's 100th anniversary so probably in august 🙄
when I do not have the clip, I use my mouth to push the spring up while I install the screw 😎
NIKON KIU
Did you say Nippon Kogaku?
I think you did the right thing, I sent one out and afterwards, the pictures were much sharper after CLA, it never hurts to do a CLA on a lens this old.
Just wondering, can you tell us what price was quoted?
Thanks,
Kiu
nomadia
Established
He quoted $90 plus shipping.
nomadia
Established
Got the lens back from Youxin a week after he received it in the mail. Everything works as it should.
Peter Jennings
Well-known
Glad to hear it!
