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#11
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"crystal clear" lenses and fungus
wrote in message
oups.com... [...] The last post I read here that was as good as that was the one where is said that purely opening and closing jpegs degraded them. I WISH that were true! Like a faded, folded and abused magazine in a doctor's office. You have inspired me! One of the things I do for the Day Job is cut macros (and some original code) for image processing. I can hook into the web-page counter to degrade a picture ever so little upon every view or interval of views. That's a good Minnesota below-zero project (okay, it's pure Cabin Fever). |
#12
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"crystal clear" lenses and fungus
wrote in message oups.com... I don't know if it happens to people here who buy second hand lenses but I recently had two cameras with the beginnings of fungus on the lenses that were described as "crystal clear, unmarked optics free from scratches or fungus etc." Maybe it is just me but I know how fungus starts. You get a film of grease first that is transparent composed of hundreds of tiny transparent round deposits. Some time later (could be years) the blobs are fewer and bigger. Some time after that these blobs send out filaments and etch the glass. I just spent five hours working on a Sonnar 180mm f2.8 to get the start of fungus off the rear of the front element (if I had known how it was constructed before I started, I guess it would only have taken an hour). It was very early stage fungus so it hadn't even affected the coating. I got a lovely Ikonta with an Zeiss-Opton Tessar lens and that had the bigger blobs but I cleaned that up and the fungus left only a slight coating of its own on the glass (it was uncoated anyway so it might even help). Have other people come across this grease film in lenses they have bought? If so, do you think it is fungus or not? Many times, was cleaned on my knees, (fast, cheap..) and sold for idiots on eBay |
#13
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"crystal clear" lenses and fungus
ELSAN wrote:
"Stacey" wrote: Fungus doesn't grow on uncoated lenses, WHAAAAT? Man, that's a reach. I assumed this because I've never had fungus problems with non-coated optics? Also never had a non-coated lens that wouldn't clean up, had lots of coated ones that wouldn't. -- Stacey |
#14
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"crystal clear" lenses and fungus
Stacey wrote: ELSAN wrote: "Stacey" wrote: Fungus doesn't grow on uncoated lenses, WHAAAAT? Man, that's a reach. I assumed this because I've never had fungus problems with non-coated It happens far less often to non-coated lenses. optics? Also never had a non-coated lens that wouldn't clean up, had lots of coated ones that wouldn't. Coating is much softer than glass so it is easy for fungus to get a hold and damage the surface. Once it is clear to anyone that fungus is growing on a coated lens (so not still in its earliest phase of being a transparent grease layer), then I have never come across one that would clean up and still have the coating intact in the affected places. What gets me is how fungus manages to get into a combination lens that is all screwed together in one unit. I know it is not air tight but I can't see how the fungus finds its way in. And I don't see how it manages to feed on something to first form that grease layer. How did it get in and behind the front element of my Sonnar 180mm for the P6, for example? |
#15
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"crystal clear" lenses and fungus
rafe b wrote:
"Done" wrote in message Only one in my lifetime - on a Nikon enlarging lens. I just threw it away. Useful response. Not. Your response was particulrly useless as it only attacked the other poster who said what he did and yet you offered no other solution to the problem. All you did is waste everyone's time by opening your post. -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: Remove FreeLunch. |
#16
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"crystal clear" lenses and fungus
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