Highly effective method to prevent lens fungus

[Cholentpot]

That does not reflect the absorbed radioactivity.

Think this brush is still harmfully radioactive? It's in a box on my desk...

 

[mrmekon]

Think this brush is still harmfully radioactive? It's in a box on my desk...

Set a little dish of sugar water on it and see if anything grows!

 

[Don_ih]

Think this brush is still harmfully radioactive? It's in a box on my desk...

Just don't keep it in your pants pocket.

 

[Sirius Glass]

Think this brush is still harmfully radioactive? It's in a box on my desk...

I was referring to the janitor in post 24.

 

[Cholentpot]

Set a little dish of sugar water on it and see if anything grows!

Just don't keep it in your pants pocket.

Instructions unclear. Put sugar and brush in pants. I now glow and speak in soviet accent.

I was referring to the janitor in post 24.

Da. Cerberusky

 

[ic-racer]

They could sell briquettes of corium to pack with one's lenses for storage...

 

[mrmekon]

They could sell briquettes of corium to pack with one's lenses for storage...

View attachment 321437

"Upcycling," they call that. Great for the environment!

 

[guangong]

Does anybody else remember the Lone Ranger Silver Bullet Atomic Ring. Peeking into the cartridge end, flashes on a tiny screen indicated striking radium atoms.
Another change in the times. We would tape our nickels,dimes, and box tops on to penny postcards for our decoder badges(Capt. Midnight), and all the other stuff, and apparently the money arrived safely

 

[markjwyatt]

UV light has nothing to do with radioactivity. You should know better than that.

UV radiaiton has nothing to do with radiation?

UV Radiation Safety

Protect yourself and others from the sun with a hat, shirt, and sunscreen (SPF 15+) all year.

www.cdc.gov

 

[snusmumriken]

Put the lens with to aperture completely open in direct sunshine in a window for several days or weeks.

I understood that you should not leave lenses in hot sunshine because it can melt the grease which then creeps over the elements.

 

[snusmumriken]

UV radiaiton has nothing to do with radiation?

UV Radiation Safety

Protect yourself and others from the sun with a hat, shirt, and sunscreen (SPF 15+) all year.

www.cdc.gov

Radium decays by emitting alpha particles (ie helium nucleus), not photons of light.

 

[Don_ih]

We would tape our nickels,dimes, and box tops on to penny postcards for our decoder badges(Capt. Midnight), and all the other stuff, and apparently the money arrived safely

It would now be ripped off by the gears of the sorting machine - like some of the emulsion on 1/5 of the postcards in the postcard exchange.

 

[markjwyatt]

Radium decays by emitting alpha particles (ie helium nucleus), not photons of light.

Gamma rays are the most potent and dangerous form of radiation, and they are photons of light. There is some gamma ray action in lanthunum for instance (used in some radioactive lens glasses) which emits some gamma radiation as part of its decay process ( https://www.spectroscopyeurope.com/...amma-spectroscopy-without-radioactive-sources ), as does radium (https://en.wikipedia.org/wiki/Radium#:~:text=Exposure to radium, internal or,0.1 micrograms of ingested radium.).

"A sample of radium metal maintains itself at a higher temperature than its surroundings because of the radiation it emits – alpha particles, beta particles, and gamma rays. More specifically, natural radium (which is mostly 226Ra) emits mostly alpha particles, but other steps in its decay chain (the uranium or radium series) emit alpha or beta particles, and almost all particle emissions are accompanied by gamma rays.[17]...<large gap in text>...Exposure to radium, internal or external, can cause cancer and other disorders, because radium and radon emit alpha and gamma rays upon their decay, which kill and mutate cells.[14]"

Also, when we start talking particle physics, particles and photons become somewhat entwined.

The wave-particle duality of photons | Photon terrace

Let's think about the true nature of light. We described that light has the properties of wave and a particle. On this page, we will take a second look at that concept.

photonterrace.net

 

[Don_ih]

A sample of radium metal maintains itself at a higher temperature than its surroundings

I just checked my Staticmaster brush and, indeed, it is .5 degrees C warmer than everything else in the room. That's great! Means it still works.

 

[markjwyatt]

I just checked my Staticmaster brush and, indeed, it is .5 degrees C warmer than everything else in the room. That's great! Means it still works.

Satellites and space craft especially use radiation to drive thermopiles that generate electricity form the heat and power some of the electronics. Space craft move far from the sun, so solar energy is less useful, and radioactive piles can produce a lot of heat and drive electricity for a long time.

 

[Sirius Glass]

UV radiaiton has nothing to do with radiation?

UV Radiation Safety

Protect yourself and others from the sun with a hat, shirt, and sunscreen (SPF 15+) all year.

www.cdc.gov

There is a difference between solar radiation and radioactivity. Very basic physics.

 

[Sirius Glass]

I understood that you should not leave lenses in hot sunshine because it can melt the grease which then creeps over the elements.

I never said to put the lenses in a place that gets hot. An inside window would get sunlight for a few hours and should not get hot, if so move the lenses.

 

[Sirius Glass]

Satellites and space craft especially use radiation to drive thermopiles that generate electricity form the heat and power some of the electronics. Space craft move far from the sun, so solar energy is less useful, and radioactive piles can produce a lot of heat and drive electricity for a long time.

That is why Voyager I & II, Galileo and many other interplanetary spacecraft care radioactive power sources.

 

[markjwyatt]

There is a difference between solar radiation and radioactivity. Very basic physics.

We do get gamma rays from solar flares. It is not as different as you may think. UV is moving more towards the visible spectrum, and yes is somewhat different, but still related.

 

[KerrKid]

Wait until you discover that lens fungus has psychoactive properties. You’ll be able to do your travel photography without ever leaving the house.

 

[koraks]

I've seen magic mushrooms being grown on a variety of substrates, but glass, plastic and metal don't appear especially suitable ones.

 

[gone]

has anybody actually studied whether it works?

Of course it works. The science behind it is what most people learn in junior high school. I and legions of others have set lenses in the sun to kill it's growth. I'm also leery about citing any information from the U.S. Army, those folks have a terrible record regarding public safety, telling the truth and spinning things w/ their PR.

UV will stop fungus growth, it won't prevent it. The spores are microscopic and can be sucked into a lens through focusing. Some lenses are worse in this regard that others. The fungus could have actually been within the lens at it's factory assembly, just waiting for the right conditions to fuel it's growth.

 

[Sirius Glass]

Of course it works. The science behind it is what most people learn in junior high school. I and legions of others have set lenses in the sun to kill it's growth. I'm also leery about citing any information from the U.S. Army, those folks have a terrible record regarding public safety, telling the truth and spinning things w/ their PR.

UV will stop fungus growth, it won't prevent it. The spores are microscopic and can be sucked into a lens through focusing. Some lenses are worse in this regard that others. The fungus could have actually been within the lens at it's factory assembly, just waiting for the right conditions to fuel it's growth.

I keep the lenses out on a shelf and not in a leather case unless I am taking it with me. I have not had fungus problems. That could be related to the relatively low humidity of the Los Angeles area.