KoNickon
Nick Merritt
Sorry, meant to say "IKEA lamp."
The nearest Ikea is 250 miles away!!! They do not offer this online. Strike two; I guess I will have to use a black light.😡
I think Phil just doesn't get it. His comments seem rather silly to me.
That's what I first did with my 50mm. The problem is, at that time the sun only shone for a day, then I forgot about it, then rain happened, then I remembered I had a lens on the window!
To my surprise, the lens still works. I think rain might have damaged the coating though, and that in some years fungus might appear… But oh well, still trying to bleach it now. 🙂
So far, LEDs are only capable of putting out very, very near visible UV - and white light (fluorescent) LEDs emit pretty much nothing invisible at all. So there is nothing that could be regulated there. It is more likely that Ikea, cheapskates as they are, use low-grade LEDs of poor colour consistency, where some will be leaking blue from the LED proper while others have too much of a fluorescent cover and a corresponding excessive yellow tint. Something like that would be perfectly in line with the notoriously poor colour rendering from Ikea CFL lamps.
I may be mistaken, but I've heard that the UV radiation will also kill fungus spores. Anybody know anything about this?
The thorium probably kills them anyway.
Another thing about the yellowed lenses.
I've had a couple Takumar 50/1.4's and comparing a clear lens to
a yellowed one, the clear one was a full stop faster. At 1.4, given the same dim indoor lighting conditions my DSLR wanted to shoot at 1/30 with the clear lens and 1/15 with the yellowed one.
In other words, the yellowing reduces the amount of light reaching the film by a stop or possibly even more depending on how bad the yellowing has become.
So, by all means you'll be doing yourselves a favor clearing those great old lenses.
The JANSJÖ work lamp from Ikea. Item number 101.287.34
I am still not comfortable putting a Hot-Glass lens on a Digital Camera. Maybe I'll take the lens off of an old Digital, put the Thorium lens over the sensor, and see if damage occurs.