Win a Pentax Limited Lens: Raffle Now Live!

**K-Three** · 04-30-2019, 07:14 PM

on today's (May 1, 2019) front page at Wikipedia (english), a photo of some lenses with varying levels of yellowing, and a link to Thorium Dioxide article
Thorium dioxide - Wikipedia
Interesting to me because the Takumars are instantly identifiable in the image, even before you enlarge it to read the fronts.

They surely could have found another 50mm tak, without the thorium to round out the shot,

Last edited by K-Three; 04-30-2019 at 07:25 PM.

**carabez** · 04-30-2019, 08:00 PM - **2 Likes**

I'd got several radio-active lens: Tomioka 55mm f1.2, Tak 8 elements 50mm f1.4 and 6x7 105mm f2.4; that was the best flare resistant tec in 70's.... so far I'm (and my 4 arms childen) proud of them all

**clackers** · 04-30-2019, 10:43 PM - **2 Likes**

Originally posted by carabez

I'd got several radio-active lens: Tomioka 55mm f1.2, Tak 8 elements 50mm f1.4 and 6x7 105mm f2.4; that was the best flare resistant tec in 70's.... so far I'm (and my 4 arms childen) proud of them all

(Laughs)

And here's a picture of you about to take it down from the shelf:

tvdtvdtvd · 05-01-2019, 10:30 AM

LOL, I almost posted the same link. Hot glass, on a couple of levels.

35mmfilmfan · 05-01-2019, 12:22 PM

When do we get the scare stories about granite worktops in millions of kitchens ?

**mikesbike** · 05-01-2019, 02:34 PM

Originally posted by 35mmfilmfan

When do we get the scare stories about granite worktops in millions of kitchens ?

Just to be on the safe side, replace those kitchen counter-tops, but don't let them go to waste. Move'm to the photo-gear room to set a collection of the above lenses on!

04-30-2019, 07:14 PM	#1
K-Three Loyal Site Supporter Join Date: May 2014 Location: Pugetopolis, WA Photos: Gallery Posts: 938	Thorium Dioxide on today's (May 1, 2019) front page at Wikipedia (english), a photo of some lenses with varying levels of yellowing, and a link to Thorium Dioxide article Thorium dioxide - Wikipedia Interesting to me because the Takumars are instantly identifiable in the image, even before you enlarge it to read the fronts. They surely could have found another 50mm tak, without the thorium to round out the shot, Last edited by K-Three; 04-30-2019 at 07:25 PM.

04-30-2019, 10:43 PM - 2 Likes	#3
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by carabez I'd got several radio-active lens: Tomioka 55mm f1.2, Tak 8 elements 50mm f1.4 and 6x7 105mm f2.4; that was the best flare resistant tec in 70's.... so far I'm (and my 4 arms childen) proud of them all (Laughs) And here's a picture of you about to take it down from the shelf: Attached Images

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help reversing thorium oxide on my lens.	Prince Harbinger	Troubleshooting and Beginner Help	49	07-12-2018 12:47 PM
MV-1 battery - alkaline or silver oxide?	Ken Ford	Film SLRs and Compact Film Cameras	14	04-26-2018 05:51 AM
1.5 volt silver-oxide battery	dyusem	Film SLRs and Compact Film Cameras	11	03-12-2009 06:18 PM
Where can I buy silver-oxide 6v batteries?	BetterSense	Pentax Camera and Field Accessories	2	08-13-2008 02:34 PM

04-30-2019, 08:00 PM - 2 Likes	#2
carabez Site Supporter Join Date: Jul 2017 Location: Cinco de Mayo Photos: Gallery Posts: 810	I'd got several radio-active lens: Tomioka 55mm f1.2, Tak 8 elements 50mm f1.4 and 6x7 105mm f2.4; that was the best flare resistant tec in 70's.... so far I'm (and my 4 arms childen) proud of them all

05-01-2019, 10:30 AM	#4
tvdtvdtvd Veteran Member Join Date: Jan 2010 Posts: 1,665	LOL, I almost posted the same link. Hot glass, on a couple of levels.

05-01-2019, 12:22 PM	#5
35mmfilmfan Pentaxian Join Date: Oct 2016 Location: Norfolk, UK Posts: 4,342	When do we get the scare stories about granite worktops in millions of kitchens ?

05-01-2019, 02:34 PM	#6
mikesbike Site Supporter Join Date: Dec 2016 Location: Southeastern Michigan Posts: 4,566	Originally posted by 35mmfilmfan When do we get the scare stories about granite worktops in millions of kitchens ? Just to be on the safe side, replace those kitchen counter-tops, but don't let them go to waste. Move'm to the photo-gear room to set a collection of the above lenses on!