April 20, 2014, 03:04:43 AM

Author Topic: How many radioactive lenses do you own?  (Read 6373 times)

flowers

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How many radioactive lenses do you own?
« on: January 31, 2014, 04:54:24 AM »
Just curious! A little bit of fun (but honest answers please!)

I own one two. :)
« Last Edit: January 31, 2014, 10:04:22 AM by flowers »

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How many radioactive lenses do you own?
« on: January 31, 2014, 04:54:24 AM »

Sella174

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Re: How many radioactive lenses do you own?
« Reply #1 on: January 31, 2014, 07:13:42 AM »
One, the Asahi Super-Takumar 1:1.4/50 (Mark II).
Sold most of my Canon gear ... here's what's left: EOS 30D (x2), EF 24mm f/2.8, EF Compact-Macro 50mm f/2.5, EF 70-200mm f/4L USM.

RomainF

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Re: How many radioactive lenses do you own?
« Reply #2 on: January 31, 2014, 07:38:47 AM »
How do ya know ? Is there some kind of a list ?
Leica & Canon
35 1.4 for both ; ultra-wide & teles for the Canon

49616E

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Re: How many radioactive lenses do you own?
« Reply #3 on: January 31, 2014, 09:40:18 AM »
I have never tested any of my lenses with my Geiger counter but I suppose I could. I am currently testing something else and will wait for that to finish first. I will report back after doing some quick tests sometime tonight if people are interested.

flowers

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Re: How many radioactive lenses do you own?
« Reply #4 on: January 31, 2014, 09:52:52 AM »
I have 4! All sigma! F.Y.I. sigma is located in FUKUSHIMA prefecture and that region is effectively CONTAMINATED.
So, ALL lenses manufactured there after 11/03/11 are in some extent radioactive. (I am serious by the way!)

Oh, then I'm sorry, I gave wrong information! I have... two radioactive lenses! :)

Sella174

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Re: How many radioactive lenses do you own?
« Reply #5 on: January 31, 2014, 09:53:35 AM »
How do ya know ? Is there some kind of a list ?

Yes, there's a list.
Sold most of my Canon gear ... here's what's left: EOS 30D (x2), EF 24mm f/2.8, EF Compact-Macro 50mm f/2.5, EF 70-200mm f/4L USM.

flowers

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Re: How many radioactive lenses do you own?
« Reply #6 on: January 31, 2014, 09:53:43 AM »
How do ya know ? Is there some kind of a list ?

Clue: Have you got a lot of red blisters oozing fluorescent green puss on your face?  :o
Ah wait, that’s puberty my mistake  ::)

haha :D

How do ya know ? Is there some kind of a list ?

Sella174 said it, there's a list! Actually a couple of lists, and you can also search for the name of your lens and if you're "lucky" enough to own a thoriated lens, you will probably find a forum thread where someone has tested it for radiation! Then you know at least your lens might be one, and reading more will help you discover more. :) In some lenses not all lenses of that kind were thoriated, only up to or after a certain year, or a certain batch.
« Last Edit: January 31, 2014, 09:56:24 AM by flowers »

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Re: How many radioactive lenses do you own?
« Reply #6 on: January 31, 2014, 09:53:43 AM »

AE1Pguy

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Re: How many radioactive lenses do you own?
« Reply #7 on: January 31, 2014, 11:00:21 AM »
I have an early Leica 50 f/2 collapsible Summicron. A few years ago, I had it recoated. The guy that did that said there was some degradation of the rare earth lens elements. He said it was due to radioactive decay.

Great lens though. Almost worth buying an A7r or something, just to put that lens back in service.

NancyP

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Re: How many radioactive lenses do you own?
« Reply #8 on: January 31, 2014, 12:59:41 PM »
Probably zero or one.
My M42 lenses date from that time, but aren't on the list. Not all lenses were made by the name on the lens label, however. My normal lens  focal length and f/stop (55mm f/1.4 Mamiya_Sekor) is not on the list in a likely name (there is a Carl Zeiss Jena Pancolar , and I am unsure if these were still made in Jena by 1968). I also have inherited an old Canon AE1 which I don't use. It has one of the lenses said to be thoriated, the 50mm f/1.8, but I haven't checked this particular one, either by looking for the characteristic yellow tinge or by geiger counter, which I do have access to at work.

mackguyver

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Re: How many radioactive lenses do you own?
« Reply #9 on: January 31, 2014, 03:39:13 PM »
I was living rather close to Chernobyl (lucky me) when it melted down, so I probably am irradiating my lenses :).  Between that and living in London during the mad cow disease outbreak, I had a nice time in Europe during the 80s & early 90s ;)
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TS-E 24 3.5L II :: Extender 1.4x III | 2x III :: EF-M 22 2 | 18-55mm 3.5-5.6 IS

surapon

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Re: How many radioactive lenses do you own?
« Reply #10 on: January 31, 2014, 03:54:29 PM »
I was living rather close to Chernobyl (lucky me) when it melted down, so I probably am irradiating my lenses :).  Between that and living in London during the mad cow disease outbreak, I had a nice time in Europe during the 80s & early 90s ;)


+1 for me too , Dear Mr. mackguyver.
My home for past 35 years is located   with in 10 miles from the big nuclear plants---Yes, We get FREE IODINE PILLS from The Local Government in every years, The Local government give us the direction how to use these Iodine pill incase of the NUKE  break down. Just Put in our  A__ Hole, Incase of we have diarrhea, and our brown movement ( SH-T) will not contaminate the Soil.  No, Not for take by Mouth, Because too late in the  very close area like my home, to the NUKE Plants and I will die any way.

YES, Past 35 years, All of my Canon Lenses are Radioactive Lenses, Why ?---Because all of my Photos are Lousy/ Not Good Pictures, With Green Shade Colors---Not Good as my 2 weeks old Canon EOS-M, And M Lenses---Just New Lenses/ New Camera  and do not get Contaminated Yet = Still great Photos ---Ha, Ha, Ha.
I must buy another 7 D MK II when she on the market, and Keep her in the Lead Box all the times, And Will improve my Photos quality.

Just Kidding/ Joking before the great Weekend start.
Surapon
« Last Edit: January 31, 2014, 03:56:59 PM by surapon »

sjschall

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Re: How many radioactive lenses do you own?
« Reply #11 on: January 31, 2014, 05:31:21 PM »
I thought I had one, but it mutated and keeps duplicating. I think I have 8 now, wait . . . 16.

marcel

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Re: How many radioactive lenses do you own?
« Reply #12 on: January 31, 2014, 08:10:43 PM »
Canon FL 50 1.8 and FD 50 1.8 chrome nose.
5D | 550D | 600D | 600 | RT | 14 L | 28 1.8 | 35 2 | 50 1.8 mk 1 | 16-35 L mk 2 | 28-80 2.8-4L | 50-200 3.5-4.5 L | 80-200 2.8 L | 100-300 5.6 L | Pixma Pro 9500 |  FT QL | FTbN QL |  FD 24 2.8 | FD 28 3.5 | FD 35 3.5 | FDn 35 2 | FD 50 3.5 SSC M | FD 100 2.8 | FD 135 3.5 |  FD 200 4 |

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Re: How many radioactive lenses do you own?
« Reply #12 on: January 31, 2014, 08:10:43 PM »

49616E

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Re: How many radioactive lenses do you own?
« Reply #13 on: February 01, 2014, 04:59:20 PM »
I tested all my lenses today. Most of the lenses tested did not show any significant levels of radiation above background but my EF 100-400 4.5-5.6 IS (1998 date code) was at 96 CPM above normal background levels. Additionally, I accidentally left a B+W XS-Pro UV filter on and it was at 50CPM above background levels. From that discovery I tested all my B+W XS-Pro UV filters and they all had about this same level above background levels. I also tested B+W kaesemann polarizers (the slim MRC ones) and they tested negative.

Each test was performed by putting a 2" highly sensitive Geiger-Muller tube up as close as possible to the front element (or filter) and performed a 10 minute timed test in order to figure out the average CPM over that time.

Lenses tested:
EF 100-400 4.5-5.6 IS (96 CPM over normal background levels, 1998 date code)
EF 70-200 2.8 IS II
EF 85 1.2
EF 100 2.8 IS Macro
TS-E 24 3.5 II
2 different EF 40mm 2.8s (An older one and a newer one)
EF 8-15 4.0 (This one seemed to have a consistently minor reading above background, about 5 CPM and may not be significant.)
EF 2x extender III


ME

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Re: How many radioactive lenses do you own?
« Reply #14 on: February 02, 2014, 03:07:59 PM »
I think everyone is missing an important factor: Does your equipment glow enough in the dark to aid your lowlight photography?? The white balance might have to be adjusted.  :o
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Re: How many radioactive lenses do you own?
« Reply #14 on: February 02, 2014, 03:07:59 PM »