View previous topic :: View next topic |
Author |
Message |
FedericoMenaQuintero
Joined: 14 Jul 2014 Posts: 4
|
Posted: Mon Jul 14, 2014 11:31 pm Post subject: Infinity focus is wrong in two Nikon lenses |
|
|
FedericoMenaQuintero wrote:
Hi, all, newbie here.
I took two of my favorite lenses for CLA, and the @#$% shop put them back incorrectly, so that infinity focus is wrong.
In a Nikkor 50mm f/1.4 (AI), it was focusing past infinity and the focusing ring was misaligned. I was able to fix the misalignment of the ring, but I can't figure out how to realign the helicoid.
In a Nikkor-N 28mm f/2, the shop left a lot of front-to-back play in the focusing ring, and some rotational play as well. Also, the lens doesn't reach infinity focus.
I haven't disassembled the 28mm f/2 yet, but it sounds like they also misaligned the helicoid. I hope the play/looseness in the focusing ring is easy to fix; no idea what is causing it.
Is there a recommended way of re-screwing the helicoid to the inner and outer pieces, other than trial and error? I'm having a lot of trouble screwing it at all in the 50mm f/1.4; already managed to do it once, and it's not even in the right "slot" yet
Thanks for any advice!
(Lest you think I'm a complete idiot, I managed to erroneously disassemble the diaphragm and had blades all over the place... put it back together after a little trial-and-error, and it turned out fine. But the helicoid is giving me fits) |
|
Back to top |
|
|
FedericoMenaQuintero
Joined: 14 Jul 2014 Posts: 4
|
Posted: Mon Jul 14, 2014 11:33 pm Post subject: |
|
|
FedericoMenaQuintero wrote:
I forgot to mention - I don't trust the shop to put them back together properly if I bring the lenses to them again. The guy was pretty clueless when I showed him *in the camera* how infinity focus was off. |
|
Back to top |
|
|
visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
|
Posted: Mon Jul 14, 2014 11:53 pm Post subject: Re: Infinity focus is wrong in two Nikon lenses |
|
|
visualopsins wrote:
Welcome FedericoMenaQuintero
FedericoMenaQuintero wrote: |
Is there a recommended way of re-screwing the helicoid to the inner and outer pieces, other than trial and error? |
Other than using the alignment marks made during dis-assembly, I don't know, but if you find method for one lens it may repeat well in the others. Perhaps a lens was already CLA before; you might check for alignment marks. Remember you are lucky the lenses are not zooms. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200
Tele-Takumar 1:5.6/200, 1:6.3/300
Macro-Takumar 1:4/50
Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm
Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element),
Super-Multi-Coated Fisheye-TAKUMAR 1:4/17
Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500
Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100
Super-Multi-Coated Bellows-TAKUMAR 1:4/100
SMC TAKUMAR 1:1.4/50, 1:1.8/55
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto
|
|
Back to top |
|
|
FedericoMenaQuintero
Joined: 14 Jul 2014 Posts: 4
|
Posted: Tue Jul 15, 2014 12:25 am Post subject: Re: Infinity focus is wrong in two Nikon lenses |
|
|
FedericoMenaQuintero wrote:
visualopsins wrote: |
Other than using the alignment marks made during dis-assembly, I don't know, but if you find method for one lens it may repeat well in the others. Perhaps a lens was already CLA before; you might check for alignment marks. Remember you are lucky the lenses are not zooms. |
Thanks, that's a good idea. I'll look for alignment marks tomorrow when sunlight is good
I have no idea if these lenses had ever been disassembled before I took them to this crappy shop. I bought them used over 13 years ago, and other than gradual dirtification, they've performed very well. |
|
Back to top |
|
|
calvin83
Joined: 12 Apr 2009 Posts: 7547 Location: Hong Kong
|
Posted: Tue Jul 15, 2014 3:55 am Post subject: |
|
|
calvin83 wrote:
Make sure the floating elements(CRC) on Nikkor-N 28mm f/2 is working fine. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
|
Back to top |
|
|
FedericoMenaQuintero
Joined: 14 Jul 2014 Posts: 4
|
Posted: Tue Jul 15, 2014 1:12 pm Post subject: |
|
|
FedericoMenaQuintero wrote:
calvin83 wrote: |
Make sure the floating elements(CRC) on Nikkor-N 28mm f/2 is working fine. |
Hmm, how do I do this? I haven't disassembled that lens yet, so I don't really know what to look for. |
|
Back to top |
|
|
peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
|
Posted: Tue Jul 15, 2014 2:40 pm Post subject: |
|
|
peterqd wrote:
I don't know about old Nikkor lenses, but most makes have a way of adjusting the infinity setting. Usually, under the engraved ring
round the front element there are 3 screws which clamp the outer helicoil to the focussing ring. The procedure is to focus carefully on
infinity through the viewfinder, and then loosen these screws so that the ring can be rotated without moving the helicoil. Set the ring
against the infinity stop and tighten the screws. I hope this works for you. _________________ Peter - Moderator |
|
Back to top |
|
|
calvin83
Joined: 12 Apr 2009 Posts: 7547 Location: Hong Kong
|
Posted: Tue Jul 15, 2014 3:15 pm Post subject: |
|
|
calvin83 wrote:
FedericoMenaQuintero wrote: |
calvin83 wrote: |
Make sure the floating elements(CRC) on Nikkor-N 28mm f/2 is working fine. |
Hmm, how do I do this? I haven't disassembled that lens yet, so I don't really know what to look for. |
The floating lens group(s) will have their own separate gearing allowing them move independently to the other lens elements. You will be able to discover them when you are disassembling the lens. This is all I know. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
|
Back to top |
|
|
Gardener
Joined: 22 Sep 2013 Posts: 950 Location: USA
|
Posted: Thu Jul 17, 2014 3:16 pm Post subject: Re: Infinity focus is wrong in two Nikon lenses |
|
|
Gardener wrote:
FedericoMenaQuintero wrote: |
In a Nikkor 50mm f/1.4 (AI), it was focusing past infinity and the focusing ring was misaligned. I was able to fix the misalignment of the ring, but I can't figure out how to realign the helicoid. |
If it reaches infinity, all you need to do is set the infinity where you want it to be. The only reason to disassemble the helicoids would be if the lens could not reach infinity. |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|