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new_berlin
Joined: 27 Mar 2011 Posts: 37
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Posted: Thu Feb 28, 2013 1:33 am Post subject: Safe to subject a 25mm Super Comat f1.9 to a hair dryer? |
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new_berlin wrote:
I acquired a Taylor Hobson 1" f1.9 Super Comat (the England version) c-mount lens. The good news is that the aperture ring is stuck at a relatively fast f2 permitting decent pics to be taken. The bad news is that the aperture ring appears immovable. I am pondering whether to subject the lens to hot air from a hair dryer to see if the ring loosens. Is there any damage this can cause?
Alternatively, I see a couple screws - one near the focus ring which works fine, and another near the aperture ring. Might this screw be put to some advantageous use?
Sorry about the jejune topic but hoping a cine lens expert might offer a pointer or two. TIA. |
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kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Thu Feb 28, 2013 4:20 am Post subject: |
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kds315* wrote:
A few drops of Naptha (lighter fluid) should do the job and some mild (!!) warm air. At least in my cases it did... _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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cooltouch
Joined: 15 Jan 2009 Posts: 9097 Location: Houston, Texas
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Posted: Thu Feb 28, 2013 6:10 am Post subject: |
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cooltouch wrote:
I have dismantled some old cine lenses in the past, like Wollesaks and Kern Switars, and what often happens is the helical grease coagulates to the point that it takes on the consistency of paraffin or crayon -- like wax, in other words. When it gets like this, it will take more than a drop or two of naphtha to loosen things up. I ended up cleaning the dried stuff out from these lenses using dental picks, but I did use naphtha to help speed things along. In retrospect, it would seem that applying hot air would actually be a good idea because it will help liquify the wax.
Most hair dryers don't have enough heat output to damage the lens, I would think, especially if you're waving the dryer back and forth. In other words, I wouldn't just park the lens in front of the hairdryer and let it run for a long time. _________________ Michael
My Gear List: http://michaelmcbroom.com/photo/gear.html
My Gallery: http://michaelmcbroom.com/gallery3/index.php/
My Flickr Page: https://www.flickr.com/photos/11308754@N08/albums
My Music: https://soundcloud.com/michaelmcbroom/albums
My Blog: http://michaelmcbroom.com/blogistan/ |
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new_berlin
Joined: 27 Mar 2011 Posts: 37
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Posted: Thu Feb 28, 2013 5:32 pm Post subject: |
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new_berlin wrote:
kds315* and cooltouch
Thanks for the responses. I will give the hair-dryer a try. If it doesn't do the trick, I will try the naptha route. A few more questions if I may--
1. kds315* mentioned that naptha is the same as lighter-fluid. I do have a bottle of lighter fluid used for backyard barbecue -- is this the same thing?
2. Do I simply put a drop or two on the OUTSIDE of the lens near the gap between aperture ring and body?
3. Are the hair-dryer and/or naptha approaches temporary or permanent solutions? What I mean is will the gunk that's made thinner by heat or fluid solidify again in an hour or two?
Update: Hair-dryer did not do the trick. Instead, the c-screw-mount has decided to begin turning...ugh. The 3 screws at the rear near the mount look pretty tempting...hopefully I will hold off doing something rash until you guys see this thread again. |
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kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Thu Feb 28, 2013 6:29 pm Post subject: |
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kds315* wrote:
I usually put some naptha on a toothpick and apply it to the slit where the focusing is and hold the lens so that gravity allows the naptha find its way towards the helicoid inside. Usually 1..2 little droplets do. That after having warmed up the lens. THEN I let that work some 20-30 minutes and try to move it gently. Sometimes I repeat the process...
If that DOES NOT work, I send it to my lens service tech... _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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cooltouch
Joined: 15 Jan 2009 Posts: 9097 Location: Houston, Texas
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Posted: Fri Mar 01, 2013 4:36 am Post subject: |
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cooltouch wrote:
new_berlin wrote: |
kds315* and cooltouch
Thanks for the responses. I will give the hair-dryer a try. If it doesn't do the trick, I will try the naptha route. A few more questions if I may--
1. kds315* mentioned that naptha is the same as lighter-fluid. I do have a bottle of lighter fluid used for backyard barbecue -- is this the same thing?
2. Do I simply put a drop or two on the OUTSIDE of the lens near the gap between aperture ring and body?
3. Are the hair-dryer and/or naptha approaches temporary or permanent solutions? What I mean is will the gunk that's made thinner by heat or fluid solidify again in an hour or two?
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1. Yes, naphtha and lighter fluid are indeed the same, although it's a lot cheaper when you buy it as naphtha. Your bbq lighter fluid is probably very close to naphtha, if not the same thing, and I would think could be used in its place.
2. Klaus gave a good answer to this.
3. No they are not permanent solutions, and yes the grease will resolidify. What has happened to the lubricant is this: its "light ends" have cooked off. In other words, the more volatile components of the grease slowly evaporated over time, leaving the heavy, waxy solids behind. Warming it up will work only for as long as its warm, and naphtha will just evaporate, leaving you where you were to start with. You need to replace the lube. _________________ Michael
My Gear List: http://michaelmcbroom.com/photo/gear.html
My Gallery: http://michaelmcbroom.com/gallery3/index.php/
My Flickr Page: https://www.flickr.com/photos/11308754@N08/albums
My Music: https://soundcloud.com/michaelmcbroom/albums
My Blog: http://michaelmcbroom.com/blogistan/ |
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JohnBar
Joined: 21 Jun 2012 Posts: 581 Location: Liverpool
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Posted: Tue Mar 05, 2013 11:46 am Post subject: |
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JohnBar wrote:
I had a old lens which had been in storage for 40+ year.
The grease had actually crystallised _________________ Rectilux 3FF Series single focus anamorphic attachments
http://www.transferconvert.co.uk/cinemania/rectilux-3ff.html
Regular News on https://www.facebook.com/pages/Rectilux/704770636267200 |
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new_berlin
Joined: 27 Mar 2011 Posts: 37
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Posted: Sun Mar 17, 2013 9:42 pm Post subject: |
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new_berlin wrote:
OP here and here's what I've been up to
Lighter fluid didn't help. So I unscrewed all the screws (3 at the back, and 1 at front near aperture ring). I managed to unscrew the big parts and the result was what you see in picture 1.
Interestingly, when I took a toothpick and pushed the black part (pointed at with an arrow), it rotates silky smooth -- and guess what -- the aperture blades move beautifully. So I don't think the aperture blades are stuck. So I think the outside-apertureadjustment-ring is the problem, i.e the issue is more at the surface.
[img]
Picture 2 shows the aperture ring from up close. This ring does not budge at all. I removed 1 long screw from the hole seen but to no avail. Any ideas on how to remove this ring? Does it unscrew? I can't for the life of me see how this aperture ring moves the black cylinder seen through the T-shaped hole.
[/img]
Ideas on removing the outer chrome aperture ring would be great. If I know it unscrews, I would have more confidence forcing it with a tool. TIA. |
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