Forgot Password
Pentax Camera Forums Home
 

Closed Thread
Show Printable Version Search this Thread
03-25-2011, 05:16 AM   #16
Inactive Account




Join Date: Mar 2011
Location: Espoo
Posts: 5
Original Poster
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
Inactive Account




Join Date: Dec 2008
Location: Ames, Iowa, USA
Photos: Albums
Posts: 2,965
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
Veteran Member
Frogfish's Avatar

Join Date: Dec 2009
Location: Shanghai
Posts: 4,490
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
Lens Buying Addict
monochrome's Avatar

Join Date: Mar 2008
Location: Kirkwood (St. Louis) MO
Photos: Gallery | Albums
Posts: 19,459
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
Inactive Account




Join Date: Oct 2007
Location: Brisbane, QLD, AUS
Posts: 3,262
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
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 26,189
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
Inactive Account




Join Date: Oct 2007
Location: Brisbane, QLD, AUS
Posts: 3,262
I'm not trying that with any of the damn spiders around here.
03-26-2011, 12:00 PM   #23
Site Supporter
Bramela's Avatar

Join Date: Jan 2007
Location: Newcastle Australia
Photos: Gallery | Albums
Posts: 5,281
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
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 6,929
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
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 26,189
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
Lens Buying Addict
monochrome's Avatar

Join Date: Mar 2008
Location: Kirkwood (St. Louis) MO
Photos: Gallery | Albums
Posts: 19,459
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
Veteran Member




Join Date: Aug 2010
Location: Winnipeg MB
Photos: Gallery
Posts: 346
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
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,296
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
Pentaxian
Ratmagiclady's Avatar

Join Date: Nov 2008
Location: GA
Photos: Gallery | Albums
Posts: 13,464
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
Senior Member




Join Date: Jul 2008
Location: South Carolina, USA
Posts: 276
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 ÁSv per year, even if you were about 3 inches from the front or rear element for the whole time.
Closed Thread

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Fistful of Super-Takumars: 2-35mm/3.5 1-55mm/1.8 southy Sold Items 6 01-22-2010 04:05 AM
For Sale - Sold: Two Super Takumars Curbster54 Sold Items 5 07-20-2009 06:55 AM
qns on super takumars mounts mccarvindh Troubleshooting and Beginner Help 4 07-17-2009 03:51 PM
Is this a good deal for Super Takumars? Nachodog Pentax SLR Lens Discussion 10 10-14-2008 08:30 PM
Some Takumars radioactive? FHPhotographer Pentax SLR Lens Discussion 33 09-20-2008 08:30 PM



All times are GMT -7. The time now is 02:41 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top