Go Back   Rangefinderforum.com > Cameras / Gear / Photography > Coffee With Mentors > Nikon Historical Society

Nikon Historical Society -- hosted by the founding member Bob Rotoloni and members of the society. The NHS, based the US, has a worldwide membership. Our "Nikon Journal," published four times a year, concentrates on the history of Japanese photo equipment from the perspective of the Nikon Camera Company. The Nikon Journal often includes Nikon information not published anywhere else in the world. This forum provides an opportunity for conversation between collectors and users of classic film Nikons. See forum “stickies” for more information about the Society. If you are a serious Nikon Collector, you MUST be a NHS member. Join at http://www.nikonhistoricalsociety.com/!

Reply
 
Thread Tools Search this Thread Display Modes

Thorium Glass in the 35/1.4 Nikkor??
Old 06-04-2010   #1
mynikonf2
OEM
 
mynikonf2's Avatar
 
mynikonf2 is offline
Join Date: Jan 2006
Location: ...resident of the Virgo Galactic Supercluster +/-
Age: 65
Posts: 609
Thorium Glass in the 35/1.4 Nikkor??

Does the 35mm 1.4 Nikkor contain Thorium glass elements? I understood it to be that the lens starting with serial number 350001 & proceeding through lens # 376927 did contain Thorium glass. That would mean that this glass was used all through the 9 aperture blade “N” series, continued through the 7 blade “NC” series and ended with the beginning of the “K” series. Again, can anyone confirm this?

...this thread is starting behave just like my lens.
__________________
Mike Blache'
N.H.S. member



“Light scratches consistent with age and wear”
Save

Last edited by mynikonf2 : 06-11-2010 at 13:03.
  Reply With Quote

Old 06-04-2010   #2
Brian Sweeney
Registered User
 
Brian Sweeney's Avatar
 
Brian Sweeney is offline
Join Date: Jan 2004
Posts: 14,922
I cannot confirm this: I have a Non-AI, all-metal 28/2 that shared much of the design with the 35/1.4. I'll take a look, but it does not seem to have any of the yellowing of my 50/1.4 Tak.
  Reply With Quote

Old 06-04-2010   #3
Brian Sweeney
Registered User
 
Brian Sweeney's Avatar
 
Brian Sweeney is offline
Join Date: Jan 2004
Posts: 14,922
My 28/2 Nikkor-NC does not show any of the yellowing associated with Thorium. I've never seen or heard of anyone complaining about yellowing in a Nikkor F-Mount lens, aside from Canadian Balsam giving a slight yellow-cast.
  Reply With Quote

Old 06-04-2010   #4
BillBingham2
Registered User
 
BillBingham2's Avatar
 
BillBingham2 is offline
Join Date: Jun 2005
Location: Ames, Iowa, USA
Posts: 5,262
Interesting question for the folks over at the Nikon Historical Society perhaps.

Where is Fred when you need him?

B2 (;->
  Reply With Quote

Old 06-08-2010   #5
MaxElmar
Registered User
 
MaxElmar's Avatar
 
MaxElmar is offline
Join Date: Aug 2008
Location: Central New Jersey
Posts: 501
My 35/1.4 is quite yellow. It's not really usable for slide film but on B&W and digital it works fine. I've thought about treating with UV to clear the yellowing. I'm pretty sure it's in the serial block mentioned above.
__________________
Chris L.

Still Photographically Uncool
  Reply With Quote

Old 06-08-2010   #6
Mister E
-
 
Mister E is offline
Join Date: May 2010
Location: I <3 NCPS
Posts: 1,603
I am 99% sure that it contains Thorium. Only the Nikkor-N version. The 28/2 does not.
  Reply With Quote

Old 06-08-2010   #7
Mister E
-
 
Mister E is offline
Join Date: May 2010
Location: I <3 NCPS
Posts: 1,603
It's specifically this one lens that yellows. I think the 55/1.2 will also do that.
  Reply With Quote

Old 06-08-2010   #8
NIKON KIU
Did you say Nippon Kogaku
 
NIKON KIU's Avatar
 
NIKON KIU is offline
Join Date: Feb 2006
Location: Washington DC suburbs
Age: 55
Posts: 1,923
Read the story here:
http://imaging.nikon.com/products/im...kkor/n27_e.htm

and if you have more time, read the story of the 1.8 here:
http://imaging.nikon.com/products/im...kkor/n03_e.htm

Kiu
  Reply With Quote

Old 06-08-2010   #9
ferider
Registered User
 
ferider's Avatar
 
ferider is offline
Join Date: May 2005
Posts: 11,156
Hi Kiu,

given Jon's recent tests and both his and my vintage 35/1.8 having amber glass, I am suspecting the 35/1.8 to be radioactive (Lanthanum + Thorium based), too.

What do you think ?

Roland.
  Reply With Quote

Old 06-08-2010   #10
NIKON KIU
Did you say Nippon Kogaku
 
NIKON KIU's Avatar
 
NIKON KIU is offline
Join Date: Feb 2006
Location: Washington DC suburbs
Age: 55
Posts: 1,923
It sure is radioactive. If memory serves me right, while visiting, Brian actually had a guage(being the MAD scientist that he is) that showed us a little radio-activity. Not enough to cause harm though.

Or was that a thread here?

Help me Brian...

Kiu

Last edited by NIKON KIU : 06-08-2010 at 11:31.
  Reply With Quote

Old 06-08-2010   #11
Brian Sweeney
Registered User
 
Brian Sweeney's Avatar
 
Brian Sweeney is offline
Join Date: Jan 2004
Posts: 14,922
I have measured a lens with a Geiger Counter before- but it was a BIG lens on a 35mm camera with a 1.6 million frame per second motor drive. Helium Turbine.
  Reply With Quote

Old 06-11-2010   #12
P. Lynn Miller
Registered User
 
P. Lynn Miller's Avatar
 
P. Lynn Miller is offline
Join Date: Feb 2007
Location: Sydney, Australia
Posts: 805
I have owned and used a Nikkor-N 35mm f1.4 for years... and it definitely develops a yellow cast which is easily cured by a few days in the direct sun. Whether this is the balsam yellowing or dirty radioactive glass, I am not sure. I have to bleach mine about 5 years or so. Since I shoot mostly B&W it does not effect the negatives too much. I usually notice first through the viewfinder, when I change lenses. It also effects exposure, about 1/2 stop at it worst. My 35/1.4 has just spent its third full day on the veranda and is almost clear again. Another few days and it will be good for another five years or so. The 35/1.4 also needs to have an overhaul, focusing is getting loose and rattly again.
__________________

P. Lynn Miller
Sydney, Australia

I have one of those Flickr thingy's...
  Reply With Quote

Old 06-11-2010   #13
awilder
Registered User
 
awilder is offline
Join Date: May 2005
Posts: 1,339
Try this link: http://photo.net/nikon-camera-forum/0054IM
It should answer your question on the 35/1.4 Nikkor regarding thorium content.
__________________
<a href='http://www.rangefinderforum.com/photopost/showgallery.php?cat=500&ppuser=2121'>My Gallery</a>
  Reply With Quote

Old 06-11-2010   #14
mynikonf2
OEM
 
mynikonf2's Avatar
 
mynikonf2 is offline
Join Date: Jan 2006
Location: ...resident of the Virgo Galactic Supercluster +/-
Age: 65
Posts: 609
Quote:
Originally Posted by awilder View Post
Try this link: http://photo.net/nikon-camera-forum/0054IM
It should answer your question on the 35/1.4 Nikkor regarding thorium content.
Thanks awilder, this is exactly what I was looking for. I had suspected this for some time now but could not find a source to back up my suspicions.
...and thanks to everyone else for pitching in before my original post became to yellow to read.
__________________
Mike Blache'
N.H.S. member



“Light scratches consistent with age and wear”
Save
  Reply With Quote

Old 01-28-2016   #15
awilder
Registered User
 
awilder is offline
Join Date: May 2005
Posts: 1,339
Canon's remarkably sharp 1st version of the 35/2 FD (the one with the concave front element) also contained radioactive thorium glass.
__________________
<a href='http://www.rangefinderforum.com/photopost/showgallery.php?cat=500&ppuser=2121'>My Gallery</a>
  Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 04:10.


vBulletin skin developed by: eXtremepixels
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

All content on this site is Copyright Protected and owned by its respective owner. You may link to content on this site but you may not reproduce any of it in whole or part without written consent from its owner.