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Zeiss 85/1.2 at ebay
- Thread starter dirk
- Start date
I dont think that UV is going to help much. It cannot penetrate into the nooks and crannies of your precious lens. There isn't sufficient energy in the photons to even go through the thinnest metal!
If you want to keep the lens, I would consider these possibilities:
1. Ethylene dioxide: Get a hospital near you to gas sterilize the lens. I'd repeat it 3 times! Yes it may damage seals, however, it will prevent contaminating other flass and at least you could contemplate rebuilding it.
2. Chlorine gas: do research on that. I beleive govt used that or some derivative for federal buildings after anthrax attacks.
3. Radiating it. You could have the lens radiated. However you would need something like a 20 Million electron Volt accelerator and you would need a dose of about 50,000 rad, photons! It is doable in any research lab that radiates bacteria for research or a cancer center or idustrial sterilization plant.
3. In any case, from now on all your lenses have to be stored in a humudity controlled chamber. These are designed for cameras.
All your shelves need to be cleaned with bleach. Discard lens cleaning cloths, bags, straps or gas sterilize them x 2 as descrived above.
Don't underestimate your problem.
Essentialy, your whole lens system is infected or at great risk.
Asher
If you want to keep the lens, I would consider these possibilities:
1. Ethylene dioxide: Get a hospital near you to gas sterilize the lens. I'd repeat it 3 times! Yes it may damage seals, however, it will prevent contaminating other flass and at least you could contemplate rebuilding it.
2. Chlorine gas: do research on that. I beleive govt used that or some derivative for federal buildings after anthrax attacks.
3. Radiating it. You could have the lens radiated. However you would need something like a 20 Million electron Volt accelerator and you would need a dose of about 50,000 rad, photons! It is doable in any research lab that radiates bacteria for research or a cancer center or idustrial sterilization plant.
3. In any case, from now on all your lenses have to be stored in a humudity controlled chamber. These are designed for cameras.
All your shelves need to be cleaned with bleach. Discard lens cleaning cloths, bags, straps or gas sterilize them x 2 as descrived above.
Don't underestimate your problem.
Essentialy, your whole lens system is infected or at great risk.
Asher
My opinion is quite different.
It is unethical to deny treatments to our patients when they are infected, so are Zeiss lenses.
For fungal infection to take place, two factors are most important, they are the presence of spores and humidity. These two factors have to be there before infection takes place.
I agree with Dr Nasse's opinion that infected lens can start an infection in their place. However, even if they don't have infected lens, infection can still start if their working place is not dry enough. The important point that was missed in his comment is that he regarded infected lens as the most important cause of fungal spread in his place, he did not mention anything about humidity control.
No matter how much spores are around, if the place is dry enough, they simply will not germinate. Fungi are very much dependant on the humid environment.
Spores are everywhere, even if there is no infected lenses around, infection can still spread to the lenses if the place is not dry enough.
Zeiss camera lens division should have an infection control unit. The very bad experience in Dr Nasse's place suggested they do not have a good control of the humidity. It is very important to understand that dryness alone can stop the the progress of infection completely.
Destroying the 85 1.2 is a bit overkilling. I don't think I am in risk of losing all my other lenses, just store them in different containers with the correct humidity. Dryness alone can stop the infection from spreading.I will get someone to clean it and store it in closed container with blue silica gel. There was some fungi in it when I brought it in the first place.
I might consider UV, ethylene oxide and gamma radiation. However, I consider humidity control as more important than other means of killing the organisms.
I store my lenses in many containers with blue silica gel. My father gave me his oldest Leica lenses which are 30 years old. They are stored with humidity control machine. None of them are infected.
It is a pity to deny treatment for Zeiss lenses. Please do not destroy lenses. Dryness alone can stop it.
The dryness I mentioned is from 0 to 50 %.
It is unethical to deny treatments to our patients when they are infected, so are Zeiss lenses.
For fungal infection to take place, two factors are most important, they are the presence of spores and humidity. These two factors have to be there before infection takes place.
I agree with Dr Nasse's opinion that infected lens can start an infection in their place. However, even if they don't have infected lens, infection can still start if their working place is not dry enough. The important point that was missed in his comment is that he regarded infected lens as the most important cause of fungal spread in his place, he did not mention anything about humidity control.
No matter how much spores are around, if the place is dry enough, they simply will not germinate. Fungi are very much dependant on the humid environment.
Spores are everywhere, even if there is no infected lenses around, infection can still spread to the lenses if the place is not dry enough.
Zeiss camera lens division should have an infection control unit. The very bad experience in Dr Nasse's place suggested they do not have a good control of the humidity. It is very important to understand that dryness alone can stop the the progress of infection completely.
Destroying the 85 1.2 is a bit overkilling. I don't think I am in risk of losing all my other lenses, just store them in different containers with the correct humidity. Dryness alone can stop the infection from spreading.I will get someone to clean it and store it in closed container with blue silica gel. There was some fungi in it when I brought it in the first place.
I might consider UV, ethylene oxide and gamma radiation. However, I consider humidity control as more important than other means of killing the organisms.
I store my lenses in many containers with blue silica gel. My father gave me his oldest Leica lenses which are 30 years old. They are stored with humidity control machine. None of them are infected.
It is a pity to deny treatment for Zeiss lenses. Please do not destroy lenses. Dryness alone can stop it.
The dryness I mentioned is from 0 to 50 %.