Go Back   Steve's Digicams Forums > Digicam Help > Add-On Lenses

Reply
 
Thread Tools Search this Thread
Old Mar 15, 2009, 10:34 PM   #1
Junior Member
 
Join Date: Mar 2009
Posts: 4
Default

Hi,

I have Zuiko Auto-S 50mm F1.8 lens as seen in the link below:
I am wondering if this lens has radioactive content?

Thanks

http://cgi.ebay.com.au/ws/eBayISAPI....m=270318142485

Attached Images
 
snajper is offline   Reply With Quote
Sponsored Links
Old Mar 16, 2009, 11:31 AM   #2
Senior Member
 
Join Date: Dec 2006
Location: Davenport, IA
Posts: 2,093
Default

Why?
ac.smith is offline   Reply With Quote
Old Mar 16, 2009, 4:47 PM   #3
Junior Member
 
Join Date: Mar 2009
Posts: 4
Default

If it doesI was going to throw it out.
snajper is offline   Reply With Quote
Old Mar 16, 2009, 5:03 PM   #4
Senior Member
 
Join Date: Dec 2006
Location: Davenport, IA
Posts: 2,093
Default

I have never heard of any radiation issues with any commercial/consumer grade lens. I know of very specialized lenses that have a radioactive coating but those are well outside anything put on a 35mm camera.

I'd like to know the source of your concern. Does it glow in the dark?

A. C.


ac.smith is offline   Reply With Quote
Old Mar 16, 2009, 5:25 PM   #5
Junior Member
 
Join Date: Mar 2009
Posts: 4
Default

There were some lenses released by takumar, kodak, zuiko back in 50s, 60s and 70s that have radioactive glass.
snajper is offline   Reply With Quote
Old Mar 16, 2009, 7:36 PM   #6
Senior Member
 
Join Date: Dec 2006
Location: Davenport, IA
Posts: 2,093
Default

News to me. What's your source of information?

A. C.


ac.smith is offline   Reply With Quote
Old Mar 16, 2009, 8:37 PM   #7
Senior Member
 
Join Date: Dec 2006
Location: Davenport, IA
Posts: 2,093
Default

snajper wrote:
Quote:
There were some lenses released by takumar, kodak, zuiko back in 50s, 60s and 70s that have radioactive glass.
The lenses reported to have contained thorium include Canon, GAF, Kodak, Nikkor and Takumar (Pentax). No mention of Zuiko at all. Relevant documentation here:

http://www.hps.org/publicinformation/ate/q1356.html

http://www.orau.org/ptp/collection/c...cameralens.htm

http://www.nrc.gov/reading-rm/doc-co...nureg-1717.pdf

A. C.

Added: Based on the info in URL 1 and 2 and if the image shown in your original post is in fact your lens it's clean. The white backdrop would have a distinct yellow/brown cast by now if any elements contained thorium.



ac.smith is offline   Reply With Quote
Old Mar 17, 2009, 10:06 PM   #8
Junior Member
 
Join Date: Mar 2009
Posts: 4
Default

Quite a few people have reported Zuiko as being on the radioactive list.

style="BACKGROUND-COLOR: #000000"

http://forum.manualfocus.org/viewtopic.php?id=5650

http://www.google.com.au/search?hl=e...+lens&meta=

http://articles.adsabs.harvard.edu//...00310.000.html


snajper is offline   Reply With Quote
Old Mar 18, 2009, 6:43 PM   #9
Senior Member
 
Join Date: Dec 2006
Location: Davenport, IA
Posts: 2,093
Default

These, of all theURLs I've chased,seem to be authoritative links. The rest range between tertiary sources and rumor.

http://home.earthlink.net/~michaelbr...aeroektar.html

http://www.nrc.gov/reading-rm/doc-co...nureg-1717.pdf

http://www.camerapedia.org/wiki/Radioactive_lenses

http://articles.adsabs.harvard.edu//...00310.000.html

Within these sources only one Zuiko is mentioned, a 38mm f/1.8 which is from their Pen F line of 1/2 frame optics. I possibly have that lens in my collection but I can't find it at the moment. Checking the other Zuiko's (20, 38 Macro, 42f/1.2, 60,70, 150, 50-90, 400) only one, the 42 f/1.2 show a slight yellow cast when viewing a white page. I am very hesitant to suggest this might be an effect of thorium element as there is obviously something going on with that lens.There seems to be an internal layer composed oftiny, close spaced bubbles. Thisblurs the visual image through the lens except at very outer edge which is still sharp. This bubble area seems to be the source of the slight yellow tint but isn't described in any of the radiation reports. My initial reaction was that it was fungus but since none of the other lenses stored in the same location had this or any other sign of fungus I think it is a delamination of a cemented optical element.

Based on the references above and the photo of your lens I think your lens does not have thorium elements. Even if the lens contained thorium it would be safe in normal use. The risk would principally occur from a non-standard use such as an eye-piece in some other optical system.

The only way to be sure is measure yours with blog would be to send your question and the serial number of your lens to Olympus

Speaking of serial numbers one part of your photo and your description does bother me. Neither the photo nor your comments provide the serial number of the lens. Every one of my Zuiko's has the serial number engraved on the front ring along with its optical specs. I'm not an OM series specialist I find it strange that your lens does not have the serial number on the front ring. Were is in located?

A. C.




ac.smith is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 12:50 PM.