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guardian
Joined: 18 Mar 2009 Posts: 1749
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Posted: Thu Jun 27, 2013 5:48 pm Post subject: Need UV source |
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guardian wrote:
I'm about through with my fungus removal efforts on my Aero Ektar. It's time to attack the thorium yellowing of the rear element.
I had a plan: Expose rear element to the sun
A problem has arisen: We are receiving very little direct sunshine here where I live, and little is in the forecast
I live in the Northern Hemisphere. We are getting a LOT of daylight; just not much sunshine. It's cloudy.
I have struggled to think of a good UV emitter, an artificial source, I might already own. I've paged through my entire mental file but am coming up short.
I considered my carbon arc lamp and rejected long term use of that as impractical and, frankly, messy. Carbon arcs need ongoing gap readjustment and, besides, they emit a lot of RFI and visible light along with UV.
I thought of a heat lamp . . . but that's infrared, not UV.
I have my old photoflood reversal lamps from color film and print developing. They are incredibly bright and might emit a useful amount of UV. But they have very limited life and run circa 500 watts; probably not a good solution.
Some years back I owned a nice florescent UV tube. It was like a common florescent lamp, but without the phosphors. It glowed sort of purple and was dangerous to view with the naked eye. Sadly, I sold that unit to a fellow who wanted to use it to sterilize food. That sale was a mistake and I regret it.
So I need a cheap source of UV and I'm out of ideas. What easy options am I overlooking? With a lot of the fungus now removed, this lens element is looking more yellow than before. I need the strongest UV source I can afford. If I have to wait for sunshine, the way things are going, I might not be able to reassemble my lens for a year or two. |
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Aponce
Joined: 29 Jun 2013 Posts: 3 Location: Venezuela
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Posted: Mon Jul 01, 2013 12:14 am Post subject: |
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Aponce wrote:
I am thinking along the same line. I don't know, but one of those false bills detector lamps (fraud detector lamp, says the box) might do the job, they are cheap and easily available (at least where I live).
Anyone with experience in the matter? |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5028 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Mon Jul 01, 2013 8:51 am Post subject: |
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kansalliskala wrote:
You could try find an old solarium lamp? _________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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kds315*
Joined: 12 Mar 2008 Posts: 16544 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Mon Jul 01, 2013 1:27 pm Post subject: |
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kds315* wrote:
All too weak. An old sun tanning quarz burner (HANOVIA for instance, see Click here to see on Ebay or Click here to see on Ebay ) would be best, as those emit tons of UV light, but are dangerous and need to be handled with care!! _________________ 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
Last edited by kds315* on Mon Jul 01, 2013 6:48 pm; edited 1 time in total |
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guardian
Joined: 18 Mar 2009 Posts: 1749
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Posted: Mon Jul 01, 2013 2:30 pm Post subject: |
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guardian wrote:
I'm grateful for all the thoughts and suggestions. Thanks.
Don't really have this solved, yet. The lens just sits. It's raining out.
Things will get better because (regarding this project) they cannot become much worse. I hope. |
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Aanything
Joined: 27 Aug 2011 Posts: 2201 Location: Piacenza, Italy
Expire: 2014-05-30
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Posted: Mon Jul 01, 2013 2:38 pm Post subject: |
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Aanything wrote:
I have de-yellowed a couple of 1.4/50 and 2/35 takumar lenses with a 1000W UV lamp for tanning that my mother bought like 10 years ago and hasn't been used since a long time.
It is the most effective solution among the ones I tried - obviously except direct sunlight in summer.
Some white leds emit a certain quantity of UV light - the "famous" jansjo lamp from ikea appeared in a couple of articles on the web some years ago as a solution for yellowed lenses - but I found it to be extremely slow (if effective at all) in this process. _________________ C&C and editing of my pics are always welcome
Samples from my lenses
My gear
My Flickr |
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Greg_E
Joined: 19 Dec 2013 Posts: 18
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Posted: Thu Dec 19, 2013 6:20 pm Post subject: |
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Greg_E wrote:
How about the water sterilizers used in fish aquariums? I have one for killing fungus in lenses that I'm going to try next week, might work for your yellowing condition too. Mine is a large 36 watt UV-C unit, and even if it takes longer than the Sun, it works when you want it to be on unlike the Sun for me at this time of year. CHeck ebay for replacement lamps and ballasts, or buy a complete water sterilizer unit and take the tubing part off and discard it. |
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Lloydy
Joined: 02 Sep 2009 Posts: 7785 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Thu Dec 19, 2013 8:30 pm Post subject: |
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Lloydy wrote:
UV lights are easy enough to find, there are bulbs that fit standard light sockets easily available. They are commonly used for aquariams, mainly with reptiles, and are very popular as disco lights. The next time you're hitting the dance floor just steal some blue bulbs.
In the UK Maplins usually stock them.
http://www.maplin.co.uk/c/gadgets-toys-and-hobbies/professional-light/uv-lighting
.. _________________ 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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Greg_E
Joined: 19 Dec 2013 Posts: 18
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Posted: Sat Dec 21, 2013 3:42 am Post subject: |
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Greg_E wrote:
The effects "black light" style produce very little of the UV that we need to kill off fungus or energize the yellow coatings, easy to get but a poor choice for the work at hand. |
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kds315*
Joined: 12 Mar 2008 Posts: 16544 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Sat Dec 21, 2013 8:37 am Post subject: |
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kds315* wrote:
Water sterilizers (low pressure Mercury tube) work at the 253.7nm Mercury line, which is the strongest emission line, but it is very dangerous, as it is pure UV-C.
UV-A sources, often based on high pressure mercury tubes, and blacklight tubes (that use a special UV-A emitting phosphor coating inside) etc are quite safe,
but indeed may have lesser impact.
Eye protection by spcialized UV suppressing glasses (>420nm) is a MUST! I burned my eyes myself working just with a UV power LED (365nm)!! Or even better,
put all into a light tight cabinet any only switch on when all is inside and safely locked!!
But if even a white LED lamp will cure (see OP above), then an UV-A source will do even better! _________________ 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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DigiChromeEd
Joined: 29 Dec 2009 Posts: 3462 Location: Northern Ireland
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Posted: Mon Mar 06, 2017 8:23 pm Post subject: |
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DigiChromeEd wrote:
See my post here:
http://forum.mflenses.com/fast-lens-de-yellowing-without-a-uv-lamp-t68896.html _________________ "I've got a Nikon camera, I like to take a photograph" - Paul Simon |
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DConvert
Joined: 12 Jun 2010 Posts: 902 Location: Essex UK
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Posted: Tue Mar 07, 2017 12:28 am Post subject: Re: Need UV source |
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DConvert wrote:
guardian wrote: |
Some years back I owned a nice florescent UV tube. It was like a common florescent lamp, but without the phosphors. It glowed sort of purple and was dangerous to view with the naked eye. Sadly, I sold that unit to a fellow who wanted to use it to sterilize food. That sale was a mistake and I regret it.
So I need a cheap source of UV and I'm out of ideas. What easy options am I overlooking? With a lot of the fungus now removed, this lens element is looking more yellow than before. I need the strongest UV source I can afford. If I have to wait for sunshine, the way things are going, I might not be able to reassemble my lens for a year or two. |
Any UV source that will harm fungus will be dangerous to the naked eye. There are 'black light' lamps readily available. (I brought an Edison screw type one for around £5 IIRC) They give out both UV & violet light, but I'm not sure if they are actually energetic enough to do much to fungus. More energetic sources such as mercury lamps & deuterium lamps are considerably more hazardous to use ( and far more expensive!) |
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