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03-25-2011, 05:16 AM   #16
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Thank you everybody for guick and very knowledgeable answers! So radiation is not a problemn in this case. Do you have any views how best to get rid of this yellowish hue on the lens. The seller said to me that if you put the lens on a window sill for a couple of days this would clear the hue. I know that UW-radiation would do the work, but through the window? Does anybody have a good arrengement to get rid of this hue?

03-25-2011, 05:29 AM   #17
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If the UV light comes through a window it will take longer for the color to clear but that doesn't matter much.

Arrange the lens so it has a clear view of the sun or sky; open the aperture & check it periodically.

Last edited by newarts; 03-25-2011 at 05:43 AM.
03-25-2011, 05:39 AM   #18
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This answers your question I think :

http://images.sodahead.com/polls/000549337/polls_mrmagoo_02_1920_716438_answer_6_xlarge.jpeg
03-25-2011, 01:52 PM   #19
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QuoteOriginally posted by Ratmagiclady Quote
Different kind of radiation, actually, ...the difference is real, but what your cell puts out isn't officially called 'radiation. ' Tidy, eh?
OK, so cell phone radiation is non-ionizing. I stand corrected.

Someone else used a smoke detector as an example.

Most smoke detectors sold in America contain americium-241, a radioactive element with a half-life of 432 years. You get more ionizing radiation protecting yourself from dying of smoke inhalation in a house fire than you get changing a Super Takumar lens.

03-26-2011, 04:36 AM   #20
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QuoteOriginally posted by RioRico Quote
Fear not. No hair will fall out. No children will mutate. No goldfish will glow.
Well...shit. How else am I gonna get superpowers?
03-26-2011, 09:21 AM   #21
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QuoteOriginally posted by lithos Quote
Well...shit. How else am I gonna get superpowers?
...put spider in jar with lens. Wait one month. Release spider to your hand where he will automatically bite you out of spite. Next thing you know you will be climbing walls!


Steve
03-26-2011, 11:45 AM   #22
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I'm not trying that with any of the damn spiders around here.

03-26-2011, 12:00 PM   #23
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QuoteQuote:
...put spider in jar with lens. Wait one month. Release spider to your hand where he will automatically bite you out of spite. Next thing you know you will be climbing walls!
As lithos says, you don't know Aussie spiders!
03-26-2011, 06:28 PM   #24
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QuoteOriginally posted by lithos Quote
I'm not trying that with any of the damn spiders around here.
Look for a genetically engineered spider then. No pain; no gain in the super hero transformation world.
03-26-2011, 09:25 PM   #25
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QuoteOriginally posted by lithos Quote
I'm not trying that with any of the damn spiders around here.
Or the spiders around here either, to be honest! I have a good-sized divot in the middle of my forehead from a spider bite that left a necrotic lesion!


Steve


...no, no super powers...
03-26-2011, 09:32 PM   #26
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QuoteOriginally posted by stevebrot Quote
Or the spiders around here either, to be honest! I have a good-sized divot in the middle of my forehead from a spider bite that left a necrotic lesion!
A fraternity brother got one of those once from





I probably shouldn't go there
03-30-2011, 07:26 AM   #27
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After reading these posts, I automatically associate this brand name with "super dangerous", "redundant". When I pore over the market listings, I skip over Super Takumar.
03-30-2011, 08:11 AM   #28
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QuoteOriginally posted by violini Quote
After reading these posts, I automatically associate this brand name with "super dangerous", "redundant". When I pore over the market listings, I skip over Super Takumar.
You do realize that only the 50 1.4 and 35 2 have Thorium dioxide elements right? None of the other Super, S-M-C, or SMC-Taks turn yellow. But if you want to be ignorant, more Taks for the rest of us.
03-30-2011, 10:08 AM   #29
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QuoteOriginally posted by boriscleto Quote
You do realize that only the 50 1.4 and 35 2 have Thorium dioxide elements right? None of the other Super, S-M-C, or SMC-Taks turn yellow. But if you want to be ignorant, more Taks for the rest of us.

Yeah... *showing up at Violini's door in tinfoil spacesuit,* "You know, we'd better test those Limiteds for radiation, too. "





Just for fun, I thought I'd show a little bit of Thorium glass, and the yellowing. (My aforementioned 35/2)

You can't see the concave front element too well, but you can see the yellowed bit.
03-30-2011, 10:40 AM   #30
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For a little perspective, here's link to a handy chart of radiation doses and their sources and effects:

http://xkcd.com/radiation/

I'd be shocked if the amount of radiation put out by a thoriated lens was more than about 1 µSv per year, even if you were about 3 inches from the front or rear element for the whole time.
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