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BigMackCam
Joined: 18 Dec 2016 Posts: 55 Location: United Kingdom
Expire: 2018-05-05
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Posted: Sat Apr 22, 2017 11:30 am Post subject: A lighter grease for helicoid lubrication? |
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BigMackCam wrote:
I've been using a white lithium + zinc oxide grease for helicoid lubrication on several lens repairs. I don't use a lot - just enough to allow the threads to smoothly turn. It's inexpensive, and works very well for smaller lenses - but I'm finding it has slightly too high viscosity for bigger helicoids or those with many threads.
I'd like to get hold of a suitable lubricant with a viscosity similar to cold vaseline, if that makes sense? Or, alternatively, if there's a way I can lower the viscosity of the white lithium grease by mixing something else into it, that would be fine too (so long as it doesn't separate over time).
I'd be grateful for any recommendations.
Thanks in advance _________________ Mike |
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Sciolist
Joined: 29 Mar 2017 Posts: 1445 Location: Scotland
Expire: 2021-04-16
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Posted: Sat Apr 22, 2017 11:51 am Post subject: |
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Sciolist wrote:
I left a wipe of watch oil in the threads of a helicoid, then applied the grease over and it gave me the damping I required. It was recent so I don't know the long term performance yet, but I know another member mixes watch oil with his grease, then applies. |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Sat Apr 22, 2017 2:55 pm Post subject: |
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Lightshow wrote:
Two I'd recommend are http://www.ebay.ca/itm/271194713421 a very high quality Lithium grease with ptfe.
And http://www.ebay.ca/itm/252833910796 with this one being very lightweight, my Rokkor 58/1.2 felt like it was lubed with honey till I tried this stuff, afterwords, a very light feel. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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cooltouch
Joined: 15 Jan 2009 Posts: 9097 Location: Houston, Texas
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Gerald
Joined: 25 Mar 2014 Posts: 1196 Location: Brazil
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Posted: Sat Apr 22, 2017 5:00 pm Post subject: |
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Gerald wrote:
Vaseline is too viscous and oil is prone to migration. I suggest you take a look at this thread:
http://forum.mflenses.com/helicoid-lube-question-t74606.html _________________ If raindrops were perfect lenses, the rainbow did not exist. |
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guardian
Joined: 18 Mar 2009 Posts: 1749
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Posted: Sat Apr 22, 2017 6:03 pm Post subject: |
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guardian wrote:
+1
Helimax is the way to go. I've been recommending it here for years over on the repairs board. |
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Lloydy
Joined: 02 Sep 2009 Posts: 7785 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Sat Apr 22, 2017 9:18 pm Post subject: |
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Lloydy wrote:
A few weeks ago I bought a cheap CZJ Sonnar 135 / 4 with a slightly fungused front element and a very stiff focusing helicoid. With the front element out, and successfully cleaned, I could see inside the lens and most of the helicoid was visible - so I thought I would try and lower the consistency of the grease by adding a tiny drop of gun oil, which is very light.
My thinking was that grease is a 'soap' with oil in suspension, the oil in the grease provides the lubrication. If after a time the oil has separated out them maybe reintroducing a bit of light oil that would mix readily with the grease base would return to the grease back to something like its original state. We've all tried lighter fuel, and it works - until it evaporates, then the grease base goes back to being a sticky goo. Adding a light oil should be different, it should mix and not evaporate.
I used a syringe and smeared a very small amount of the gun oil around the visible helicoid, then worked the lens for a while to get the oil mixed in. The difference was dramatic, just as it is when lighter fuel is used, and the helicoid freed up nicely. That was about 4 weeks ago, and it's just as good today, even after standing for about a week since I last used it the focus is perfectly smooth and free.
There was no trace of oil on the aperture at all when I got the lens, and there's none after 4 weeks since I added the gun oil, so I'm very pleased with the experiment at this point, although it's perfectly possible the amount I used was too much and there might be oil migrating onto the aperture in the future? But I did this with minimal stripping of the lens, just the removal of the front element. If I have to strip the lens down in the future, so be it, I was prepared for that when I bought it. But at the moment it's perfectly good, for far less work. _________________ LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
My Flickr https://www.flickr.com/photos/mudplugga/
My ipernity -
http://www.ipernity.com/home/294337 |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Sun Apr 23, 2017 12:55 am Post subject: |
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Lightshow wrote:
If you always use it, the oil may stay in suspension, but if it sits a year it may migrate. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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Lloydy
Joined: 02 Sep 2009 Posts: 7785 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Sun Apr 23, 2017 10:22 am Post subject: |
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Lloydy wrote:
Lightshow wrote: |
If you always use it, the oil may stay in suspension, but if it sits a year it may migrate. |
It could do, that's a chance I took. It was just a quick fix that let me try the lens before I stripped it, which I planned to do. But while it's working, I'm not going to bother. _________________ LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
My Flickr https://www.flickr.com/photos/mudplugga/
My ipernity -
http://www.ipernity.com/home/294337 |
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devinw
Joined: 19 Aug 2016 Posts: 207 Location: Portland, OR
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Posted: Mon Apr 24, 2017 4:53 pm Post subject: |
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devinw wrote:
That Helimax should be OK.
You need to make sure you use something that is a synthetic base and doesn't migrate. So many greases will migrate and/or outgas, which is HORRIBLE for optics. I work in laser optics, so I know about this stuff.
We actually keep this stuff around here, and it's quite clean. We've put it through many tests for outgassing. It's expensive though:
http://www.apiezon.com/products/vacuum-greases/l-grease _________________
Camera: Sony a6300
E-Mount: Zeiss/Sony 16-70 f/4, Samyang 12mm f/2
Rokkor: MD PG 50mm f1.4, MD 100mm Macro f3.5, MD 135mm f2.8, MD Zoom 35-70mm f3.5, MD Zoom 75-150 f4
Canon FD: nFD 50mm f1.4, Tokina AT-X 100-300mm f4
My Flickr: https://www.flickr.com/photos/westonde/
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Gardener
Joined: 22 Sep 2013 Posts: 950 Location: USA
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Posted: Mon Apr 24, 2017 8:37 pm Post subject: |
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Gardener wrote:
But aren't apiezons terribly viscous? My recollection, from the time I worked in the lab, is that when setting glass vacuum valves with L/M mix I always hit both valve and seat with a solid blast from a heat gun before applying the grease. |
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devinw
Joined: 19 Aug 2016 Posts: 207 Location: Portland, OR
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Posted: Mon Apr 24, 2017 10:07 pm Post subject: |
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devinw wrote:
Gardener wrote: |
But aren't apiezons terribly viscous? My recollection, from the time I worked in the lab, is that when setting glass vacuum valves with L/M mix I always hit both valve and seat with a solid blast from a heat gun before applying the grease. |
The L is a bit thinner than the M. Both are fairly thick but they work really nice on fine threads in my experience. Maybe a bit too thick for fast moving stuff, you may be right. _________________
Camera: Sony a6300
E-Mount: Zeiss/Sony 16-70 f/4, Samyang 12mm f/2
Rokkor: MD PG 50mm f1.4, MD 100mm Macro f3.5, MD 135mm f2.8, MD Zoom 35-70mm f3.5, MD Zoom 75-150 f4
Canon FD: nFD 50mm f1.4, Tokina AT-X 100-300mm f4
My Flickr: https://www.flickr.com/photos/westonde/
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BigMackCam
Joined: 18 Dec 2016 Posts: 55 Location: United Kingdom
Expire: 2018-05-05
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Posted: Tue Apr 25, 2017 6:24 am Post subject: |
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BigMackCam wrote:
Thanks for the great replies, all - greatly appreciated
I think I'll be picking up some of the Helimax, and also some of that light-grade Japanese lubricant.
Does anyone know of a UK or EU supplier for Helimax? _________________ Mike |
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DigiChromeEd
Joined: 29 Dec 2009 Posts: 3462 Location: Northern Ireland
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Posted: Tue Apr 25, 2017 6:47 am Post subject: |
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DigiChromeEd wrote:
BigMackCam wrote: |
Does anyone know of a UK or EU supplier for Helimax? |
No UK supplier that I can find but this is the cheapest option from the states that I can locate:-
http://www.ebay.co.uk/itm/271194713421?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT _________________ "I've got a Nikon camera, I like to take a photograph" - Paul Simon |
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BigMackCam
Joined: 18 Dec 2016 Posts: 55 Location: United Kingdom
Expire: 2018-05-05
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Posted: Wed Apr 26, 2017 8:32 am Post subject: |
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BigMackCam wrote:
Thanks _________________ Mike |
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