Lens Trivia of the Day: Easy One.

Ok, just what the heck is going on here??

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Killing fungus that was growing inside the lenses?

That's funny.

No.

Is there a meeting of the "Ant Astronomy and Spontaneous Combustion Society" going on under each lens?

FlyingPhotog wrote in post #12477356
Is there a meeting of the "Ant Astronomy and Spontaneous Combustion Society" going on under each lens?

Very close... but no cake.

Cooking eggs?

pinhole camera?

Getting rid of the glass yellowing that occurs in older lenses through exposure to the UV light?

silvrr wrote in post #12477373
Getting rid of the glass yellowing that occurs in older lenses through exposure to the UV light?

Yes Sir!

Getting rid of the Thorium (radioactive) compound oxidation. It's amazing...how lenses went from yellow to clear...it's almost crystal clear...about 15 days.. 10 days inside the window (not as effective) and 5 days outside when it's not raining.

FatCat0 wrote in post #12477369
Cooking eggs?

LMAO...we do have a duck incubating 9 eggs in our hedge..

Hey, it's a tanning salon for camera gear!

Or somone's killing ants.

Actually this is sometimes done for two different purposes already mentioned... Killing fungus with UV light or removing a yellow tint that some older lenses tend to acquire over time. Been there, done that. It works.

More likely it's to correct the tint (very mildly radioactive glass in the elements supposedly is what causes the tint).

If you do this to kill fungus, you still end up with the remains inside the lens and might need to tear the lens down and clean it anyway.

The risk doing this is that heating the lens in the process will soften and liquify lubricants inside it enough that some migrates onto the diaphragm leaves, causing "oily/slow/sticky aperture" issues. When that happens you have no choice but to disassemble and clean the aperture.

ohay, didn't know that the yashica 50 1.7 also had this issue.

Some friends of mine logged their progress with their copies here. I ended up doing the same thing as you though with my own copy, since I've got all this San Diego sun at my disposal :P

What manual 50mm did you take this pic with. EXIF shows f/0.

Lol!

Nikon 50mm 1.4

Or a massive noctilus lens