RE: Fungus question
I once removed fungus from a A-24/2.8. It was one of the central elements that was infected. I used a lineup of three baths with acetone, alcohol+dishwasher detergent and water. That worked well. But in the end I screwed the whole thing by drying it with lens tissue. I swear it was clean from the packet, but still it scratched the element. :-(( I really wonder if that element was made of ordinary optical glass. I know calcium fluorite is much softer than glass and that it's used in lenses, so that's where my suspicion goes. Jostein - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
RE: Fungus question
Mark Roberts wrote: Here's the method that's worked for me: Disassemble the lens (how's that for an oversimplified step 1?) Remove the element(s) etc. On a similar note - I have a 35-70 AF zoom from my SFXn which shows what I would describe a small bubbles just behind the front element. Is this what is known as separation and is it repairable or do I just scrap the lens? Peter - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
You would want something that would kill the fungus, or it will just grow back. I don't know what to suggest, but Pond's cold cream probably wouldn't kill the fungus. I know 5% household bleach would, or 70% ethanol (I practise microbiology). But I don't know what they would do to the lens. I suspect not good things. Jody. We have had talk on the list in the past about Pond's Cold Cream being good for fungus removal. I would think that pointing the lens towards the sun on a clear day for a few hours would likely do serious damage to the fungus, but I think that the lens would still have to be cleaned. I have never had a fungused up lens, I would expect that you wouldn't either. Where did you get a fungused lens? Fungus can jump from lens to lens, so you want to keep the contaminated one away from the rest of your equipment. William Robb __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
We did experiments at uni on sterilising things. UV only kills microbes on a flat surface, and won't penetrate glass or even plastic very well. Some people say you can get sunburn through a closed car window, but I have yet to see the evidence. I think the warmth of the sunlight will in fact encourage the fungus to grow. Jody. Probably, but window glass is not an efficient transmitter of UV. I'm not sure how good the lens glass is at UV transmission either. No doubt some of the beneficial effect comes from the rise in temperature within the lens, along with this lowering the humidity within the lens. __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
Note that 100% alcohol is no good. Use about 70%. The reaction between alcohol and the fungus requires water as a cofactor. Jody. Here's the method that's worked for me: Disassemble the lens (how's that for an oversimplified step 1?) Remove the element(s) with fungus. Soak them in alcohol. Overnight is usually enough but if 24 hours isn't sufficient then you should give up, I suspect. This has removed fungus very effectively for me. I've never tried Ponds cold cream but the active ingredient, so to speak, in Ponds is mineral oil so I usually follow up the alcohol soak with a mineral oil treatment. Then I clean with Windex or similar window cleaner and finally I use a photography-specific lens cleaner made for multicoated lenses (purchased from the Filter Connection at http://www.2filter.com/). Reassemble lens very carefully and then see how it works. Mark - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
Ethanol (alcohol) has been used as a lens cleaner for many decades. I know the navy used it to clean periscope optics on submarines during WWII. So I don't think it would be a problem. Chlorine (bleach) may not harm the glass, but it is corrosive as hell and I would not trust it around my photo gear. --Tom petit miam wrote: You would want something that would kill the fungus, or it will just grow back. I don't know what to suggest, but Pond's cold cream probably wouldn't kill the fungus. I know 5% household bleach would, or 70% ethanol (I practise microbiology). But I don't know what they would do to the lens. I suspect not good things. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
RE: Fungus question
they could only be seen in the diffraction pattern from light reflected off the lens coating. This can be seen with a 15X Loupe (if it is there to be seen) Paul M. Provencher (ppro) -Original Message- From: Bob Blakely [mailto:[EMAIL PROTECTED]] Sent: Monday, April 23, 2001 2:12 PM To: [EMAIL PROTECTED] Subject: Re: Fungus question The etching on the coating of my lens could not be viewed with any magnifying glass. They consisted of microscopic trails so small (and also close together), they could only be seen in the diffraction pattern from light reflected off the lens coating. Also, as I said in a previous post, I suspect there are probably many strains of fungus that can do this with, probably with varying effects. FYI, the fungus does not eat the coating. There nourishment comes from the air. It's some excitement that etches the coating. Regards, Bob... Give blood. Play hockey. - Original Message - From: Provencher, Paul M. [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, April 23, 2001 8:36 AM Subject: RE: Fungus question I just disassembled a beautiful Super Takumar 70~150 Zoom (yes it was really fun...) to remove fungus from between the front elements. This lens is SMC (although not so labeled). I just took it apart, made a pencil mark on the edge of the element in question to show which way round it belonged, them simply washed the thing in warm water with some dishwashing liquid, using a jiffy pad scrubber (NOT!). No really I used warm water and some dishwashing liquid. When it was dry I just put it back together. Examination of the element surface with a 15X loupe showed no signs of etching. I might have to use the solution to kill the fungus if it comes back, but it cleaned up really easily. Paul M. Provencher (ppro) -Original Message- From: Chris Brogden [mailto:[EMAIL PROTECTED]] Sent: Sunday, April 22, 2001 10:01 PM To: [EMAIL PROTECTED] Subject: Fungus question I have a couple of questions about fungus on internal lens elements. I understand that it's possible to remove it with no damage to the glass provided that it hasn't etched the glass or coatings. Is this correct? What are some of the best methods to remove fungus? How likely is it to stay gone provided that I only use the lens in a dry climate? Does exposure to UV light (leaving it on the windowsill on a sunny day) help much? How hard is it to mark the coatings on an SMC Pentax lens? IOW, how many years might it take for some fungus to damage the coatings? I've heard estimates of around 5 years or so with single-coated elements, but I have no idea how accurate these estimates are. Has anyone had experiences--good or bad--with having fungus removed from SMC elements? Thanks! chris - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
Bob Blakely wrote: FYI, the fungus does not eat the coating...nourishment comes from the air. It's some excitement that etches the coating. Bob, oh Bob, do you realize what a straight line you've just handed to the group? :-) Stephen Moore __ You got a Zarg in here? Are you *nuts*??? - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
Yes, I agree, if you are looking at _reflected_ light (from say the sun or a light bulb) at a glance. If it's there, I assure you it can be seen quite plainly with the naked eye as a rainbow of colors - so long as light does not pass through the lens to you. Regards, Bob... Give blood. Play hockey. From: Provencher, Paul M. [EMAIL PROTECTED] they could only be seen in the diffraction pattern from light reflected off the lens coating. This can be seen with a 15X Loupe (if it is there to be seen) - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
Yes. Regards, Bob... Give blood. Play hockey. From: Stephen Moore [EMAIL PROTECTED] Bob Blakely wrote: FYI, the fungus does not eat the coating...nourishment comes from the air. It's some excitement that etches the coating. Bob, oh Bob, do you realize what a straight line you've just handed to the group? :-) - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Fungus question
Chris Brogden [EMAIL PROTECTED] wrote: I have a couple of questions about fungus on internal lens elements. I understand that it's possible to remove it with no damage to the glass provided that it hasn't etched the glass or coatings. Is this correct? Here's the method that's worked for me: Disassemble the lens (how's that for an oversimplified step 1?) Remove the element(s) with fungus. Soak them in alcohol. Overnight is usually enough but if 24 hours isn't sufficient then you should give up, I suspect. This has removed fungus very effectively for me. I've never tried Ponds cold cream but the active ingredient, so to speak, in Ponds is mineral oil so I usually follow up the alcohol soak with a mineral oil treatment. Then I clean with Windex or similar window cleaner and finally I use a photography-specific lens cleaner made for multicoated lenses (purchased from the Filter Connection at http://www.2filter.com/). Reassemble lens very carefully and then see how it works. Mark - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
RE: fungus question: Warning !
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Philippe Trottier Sent: 27 February 2001 00:48 To: [EMAIL PROTECTED] Subject: Re: fungus question: Warning ! That's why the LX at -6.5 EV and working (Heerrrmm) at low temp is great... I can send some photos of northern lights that would change the mind of many about the great north. Philippe OK - I think we'd all like to see them. Peter - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: fungus question: Warning !
This is a often-debated question. In my experience, a lens can be cleaned, perform OK and not develop fungus anymore if it is is kept in a dry and well lighted environment. Of course, if the fungus has spread so much that its acids have eaten away the coating or etched the glass surface, the only way to restore would be to re-grind and re-coat the lens, which would cost many times the value when brand-new of all but the most expensive lenses. Luis __ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: fungus question: Warning !!!!!
- Original Message - From: "Philippe Trottier" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: February 26, 2001 3:21 PM Subject: fungus question: Warning ! Hello How is Fungus getting started ??? I never even saw a fungus in a lense. You must live in a dry climate. There are some fungi that find lens coatings and Canada Balsam cement (thats what is used to cement lens elements together to make a lens group, and yes, it is from Canada) quite appetizing. Fungi needs the following conditions to grow: warm and damp. Where I live, it is not a problem, as I live in a dry climate (also a cold one right now, but that will change fairly soon). The big problem with fungi is that it can spread from lens to lens in a camera bag, so if you get one lens infected, it can ruin an entire equipment kit. I suspect it will be more of a problem for people living in the tropics and warm coastal areas than us dry landers. There are some advantages to living in Saskatchewan. William Robb Philippe - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: fungus question: Warning !!!!!
On Mon, 26 Feb 2001, William Robb wrote: There are some advantages to living in Saskatchewan. Say that often enough and you might even come to believe it. :) chris - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
OT: Re: fungus question: Warning !!!!!
- Original Message - From: "Chris Brogde Subject: Re: fungus question: Warning ! On Mon, 26 Feb 2001, William Robb wrote: There are some advantages to living in Saskatchewan. Say that often enough and you might even come to believe it. :) Nah, far better to just store my equipment here and live somewhere nice. That wouldn't be Winnipeg, BTW. Wheatfield Willie - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: OT: Re: fungus question: Warning !!!!!
On Mon, 26 Feb 2001, William Robb wrote: There are some advantages to living in Saskatchewan. Say that often enough and you might even come to believe it. :) Nah, far better to just store my equipment here and live somewhere nice. That wouldn't be Winnipeg, BTW. Winnipeg Willie Hey, it's only -18 right now... that's pretty good. And we have lots of friendly, non-sarcastic people here. Definitely a plus. :) chris - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: fungus question: Warning !
Bob B. wrote: Why do they call it Finland if you have arms and legs like the rest of us? Har! Those limbs developed after the land was named and they got in touch with the Swedes. :) Har! Lasse - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: fungus question: Warning !
That's why the LX at -6.5 EV and working (Heerrrmm) at low temp is great... I can send some photos of northern lights that would change the mind of many about the great north. Philippe Continue much further and you won't have to worry about light either. It'll be easy. Six months of the year you'll have all you want and six months of the year you won't have any. Why do they call it Finland if you have arms and legs like the rest of us? Har! Regards, Bob... If I follow my migration path I started on the 50th parallel when born.. I was on the 54th for a while , 2 years ago on the 60th... and now I live on the 64N27... Well If I continue like that, I should never have to worry about fungus. Philippe Middle of Finland - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: fungus question: Warning !
On Mon, 26 Feb 2001, William Robb wrote: There are some advantages to living in Saskatchewan. Say that often enough and you might even come to believe it. :) Nah, far better to just store my equipment here and live somewhere nice. That wouldn't be Winnipeg, BTW. Wheatfield Willie If I follow my migration path I started on the 50th parallel when born.. I was on the 54th for a while , 2 years ago on the 60th... and now I live on the 64N27... Well If I continue like that, I should never have to worry about fungus. Philippe Middle of Finland Let's see, I started at 64.8 and now I'm at 29.5--well, if I continue along my present migration path, I should wind up in Hell before too much longer. g Dan Scott (Deep in the Heart of Texas) [EMAIL PROTECTED] - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
