Takumar 50MM 1:1.4 Lens Yellowish Tinge

I've just received a beautiful (dare I say Mint?) lens for my Spotmatic's SP and II. It is a 50MM Takumar 1.4. What I find odd is that while the optics are clear as a bell, there is a slight amber or yellowish cast to the light passing through this lens. This is very unlike my SMC 1.8 55MM or my 3.5 135MM Super Takumar.
Does anyone have any thoughts on this - I haven't developed any film yet (just got it last evening), so I don't know how much this will show on the prints.

Thanks!

I understand that some of these lenses can be slightly radioactive, and this causes the yellowish effect.

Yellowing affects these lenses, and will of course result in a yellowish cast.

It can be cured by leaving the lens in sunlight, so that the rays pass through the lens. Alternatively, artificial light rich in UV will also do the trick.

G

Into the sunlight she goes. I'll let you know how it turns out.

It may take some time. Days or weeks, not minutes.

Good luck.

G

or it's just my imagination. I lined the lens up in the sun - managed NOT to set anything ablaze - and left it to bake for an hour or two this afternoon. It seems to have paled slightly.

Heck, it took 40 plus years to develope the tint so I can't very well expect it to disappear without a fight can I?

I really appreciate your help - and encouragement. I thought I'd bought a lens I could only use for B&W.

I think this forum is a wonderful idea and you should be very proud of yourselves.

Many thanks........

In my impatience to clear the lens of radiation-induced jaundice, I'd decided that the shorter days of Autumn won't do. Now the quest for a bulb strong in the UV spectrum.
Does anyone have any ideas (short of renting a few weeks at a tanning salon)? (I'll deal with Super Takumar melanoma in a later query).

Thanks

One of the tubes sold by aquatics shops for killing suspended algae.

Here for example.

Might be difficult to rig something to make it work though.

Here's another alternative you might consider:

http://www.hermes.net.au/bayling/repair.html

George

A previous discussion on this topic:
https://www.pentaxuser.com/forum/viewtopic.php?t=1249&highlight=radioactive+takumar

George - ROFL!!
That site is terrible! What a way to "dispose" of a Super Tak!!!!

I knew I'd seen one of these purple light bulbs somewhere in my distant past - in my aquarium! Thank's so much for reminding me!

George - I hope I don't have to resort to plan B - but it's a hoot!

Thank's again!

See my post under "Choosing a Lens for the Spotmatic F."

Ted

Hi Mac,
You can get a good UV lamp from the sound shops that sell disco lighting and equipment. Much cheaper and easier to use than the aquatic variety.

Kim

Thank's Kim. I was sorta thinking that way - so UV and black lights are along the same wave length?

Have a great evening!