DES Posted May 13, 2011 Author Share #21 Posted May 13, 2011 Advertisement (gone after registration) Very Interesting..Thanks for all the info. I think the first port of call will be Malcolm Taylor. I will let you know how I get on. Link to post Share on other sites More sharing options...
Advertisement Posted May 13, 2011 Posted May 13, 2011 Hi DES, Take a look here Is this a dumb question.. I'm sure you'll find what you were looking for!
stevemark Posted May 27, 2011 Share #22 Posted May 27, 2011 What's the difference between fungus and haze on a lens? K-H. Most vintage lenses are lubricated in some way with greases (e. g. aperture or helical mount). Traditional greases are a mixture of fats and soaps, the soaps often being unconventional Li- or Ba-soaps. Over the years, the fats tend to separate from the soaps: They move over the neighboring surfaces including lens surfaces. If they cover a lens surface, this causes haze. Under certain conditions the "haze" (ie the thin fat layer on the lens surface, originating from the grease) can cause "fungus" (mould) to grow. In fact, the fungus NEEDS fat/haze; it cannot grow simply on air and moisture! Therefore an "infected" lens cannot "infect" another CLEAN lens (ie a lens without haze/fat); the danger of spreading "fungus" is much smaller than usually thought. Stephan Link to post Share on other sites More sharing options...
farnz Posted May 27, 2011 Share #23 Posted May 27, 2011 Stephan, An interesting theory. But how does this explain fungus that attacks and consumes lens coatings and in some instances permanently etches the lens elements themselves? Pete. Link to post Share on other sites More sharing options...
dkCambridgeshire Posted May 28, 2011 Share #24 Posted May 28, 2011 The 560mm Telyt is a fairly simple two element design and the lens module is easy to access inside the mount for cleaning. If the fungus is on the exterior surface it should be easy to remove it. if you dont want to tackle this yourself you might consider trying Newton Ellis Camera repairs - Newton Ellis and Co who advertise that they can remove fungus ... read their 'REPAIRS' page . They state that simple repairs can be completed within two weeks ... and this could be a fairly simple procedure if not an advanced case of fungus. You state that the fungus spot is 'on the main lens' - but what exactly do you mean by this? If the fungus is on either of the outside elements it should clean off fairly easily with a lens tissue or well washed cotton cloth moistened with iso-propyl alcohol. A professional repairer would probably use the same method to clean the glass. On my 560/6.8 Telyt the rear element can be accessed by unscrewing the front lens mount from the centre section mount. The rear lens element is just 7 inches from the back of the mount. If my rear element was affected I'd attach a padded lens cloth to a wooden dowel after moistening the cloth in iso propyl alcohol and then carefully wipe the rear lens element. But are you positive the spot is in fact fungus? Can you post a photo of the offending spot? 'Old wives' tales' are frequently posted about fungus attacks on glass lens elements and they are often written by doom and gloom merchants who appear to repeat the words of other pessimists. If the fungus can removed in the early stages then it's likely that the problem can be successfully remedied. dunk Link to post Share on other sites More sharing options...
DES Posted May 30, 2011 Author Share #25 Posted May 30, 2011 The 560mm Telyt is a fairly simple two element design and the lens module is easy to access inside the mount for cleaning. If the fungus is on the exterior surface it should be easy to remove it. if you dont want to tackle this yourself you might consider trying Newton Ellis Camera repairs - Newton Ellis and Co who advertise that they can remove fungus ... read their 'REPAIRS' page . They state that simple repairs can be completed within two weeks ... and this could be a fairly simple procedure if not an advanced case of fungus. You state that the fungus spot is 'on the main lens' - but what exactly do you mean by this? If the fungus is on either of the outside elements it should clean off fairly easily with a lens tissue or well washed cotton cloth moistened with iso-propyl alcohol. A professional repairer would probably use the same method to clean the glass. On my 560/6.8 Telyt the rear element can be accessed by unscrewing the front lens mount from the centre section mount. The rear lens element is just 7 inches from the back of the mount. If my rear element was affected I'd attach a padded lens cloth to a wooden dowel after moistening the cloth in iso propyl alcohol and then carefully wipe the rear lens element. But are you positive the spot is in fact fungus? Can you post a photo of the offending spot? 'Old wives' tales' are frequently posted about fungus attacks on glass lens elements and they are often written by doom and gloom merchants who appear to repeat the words of other pessimists. If the fungus can removed in the early stages then it's likely that the problem can be successfully remedied. dunk Well here we go....... The "fungus" does not appear to be on the front of the lens, and on this lens, one can unscrew the elements completely away from its massive housing so just the lens itself and casing is in hand,so it is very easy to view or clean. However I have tried to clean the rear side with a moist cloth (even tried the cream idea) but to no avail, and I cannot feel any surface problems here. So I am not sure if it is on the back surface or between the lenses. Is it Fungus? I would have thought so.! Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/151062-is-this-a-dumb-question/?do=findComment&comment=1687012'>More sharing options...
dkCambridgeshire Posted May 30, 2011 Share #26 Posted May 30, 2011 Your lens is the massive f5.6 version which I'm not so familiar with - mine is the f6.8. If you have tried to clean the rear of the lens module but without success then maybe the spots are in between the two elements? But the two elements are cemented and TTBOMK would require manufacture of a specialist lens splitter to separate them. There was a specialist UK lens repairer who could have split the elements ( Optical Instruments Balham Optical Instruments (Balham) Ltd ) but they have ceased trading. If you are sure the spots are not on the exterior surfaces then they must be in the balsam - which could be indicative of balsam separation - but there appear to be no Newton's rings patterns visible? Hard to tell from the photos if the spots are fungus - can you take a close up photo of either spot? Occasionally the 560mm and 400mm f5.6 lens modules are offered for sale by themselves ... I believe they both share the same rear mount and diaphragm ... so might be worthwhile trying to source either one. dunk Link to post Share on other sites More sharing options...
farnz Posted May 30, 2011 Share #27 Posted May 30, 2011 Advertisement (gone after registration) Des, That certainly looks like a fungal attack and I'm fairly sure I detect tendrils (mycelium) heading away from the core in both. It may be between the lens coating and the lens element although that's unlikely unless the coating has been damaged because the fungus has to find a way in. I believe it's more common to find fungus between the coating and the element at the edge. Pete. Link to post Share on other sites More sharing options...
dkCambridgeshire Posted May 30, 2011 Share #28 Posted May 30, 2011 It's not always easy to to determine if these types of spots are fungus. Here's a couple of my Zeiss lenses with what appears to be fungus ... but it is balsam separation ... and other lenses with the same problem were 'split' by Balham Optical and then polished and recemented . These lenses were totally jammed and could not be dismantled http://i197.photobucket.com/albums/aa318/kirkwoodpix/DSCF1087.jpg dunk Link to post Share on other sites More sharing options...
k-hawinkler Posted May 30, 2011 Share #29 Posted May 30, 2011 If I am not mistaken, repairing these types of problems seems to be this outfits' specialty: Welcome to Focal Point - Lens Repair, Lens Cleaning, Camera Repair I had a haze problem on 3 surfaces of a lens, as it turned out. John Van Stelten of Focal Point was kind enough to check the lens out. He let me know what it would cost to repair it. As the cost was very reasonable, I told him to go ahead and he did an outstanding repair job. He also polished and re-coated another of my lenses. Again, a superb repair job. He is not shy letting you know when something cannot be repaired. That's my experience. K-H. Link to post Share on other sites More sharing options...
stevemark Posted May 30, 2011 Share #30 Posted May 30, 2011 Stephan, An interesting theory. But how does this explain fungus that attacks and consumes lens coatings and in some instances permanently etches the lens elements themselves? Pete. Ah, i forgot about that - of course the fungi metabolize their "food" (in this case fats and soaps), and produce various chemicals including organic acids. The latter can "dissolve" metals and metal oxides easily, as well as some glasses. Stephan Link to post Share on other sites More sharing options...
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