Hercules Fu Posted November 16, 2009 Share Posted November 16, 2009 (edited) :( I hand carried my lens case with me on plane from HongKong to Taiwan,when i arrived Taiwan(which is really colder than HongKong for approx. 4-6 degree and more humid) i find that all my lens have a strange oil layer which occupied ''only'' 75% of the surface of the front and rear piece of the lens(it's the most weird part). I think that it was a fog layer due to temperature change, so i leave my lens case opened to reduce the fog, but it fail( I did this for a whole day). Then i try to clean the oil layer with the Tiffen lens tissue, chamois cloth, micro-fibre lens cloth, it fail again, when ever i clean the oil layer, it disappear for about 3-5seconds, and it come back again. Finally, I try to clean it with kodak lens cleaner, it seems to works better, but after half a day, the oil layer come back again. The oil layer is not visible without a flashlight, i tried to look through the lens with a light bulb, it's not visible too. When to flashlight is lighting the lens with a back side light, the oil layer become extremely visible, and the circular pattern will change if i clean it with a cloth. Does anyone encounter such kind of problem before? I've no more idea on how to clean this strange oil layer anymore! :( (I don't want to clean it with 99% alcohol) *some additional detail, there is one lens without oil layer and it's a new Canon Zoom lens(EF mount), and all the lens suffering now are Nikon AI old mf lens Edited November 16, 2009 by Hercules Fu Link to comment Share on other sites More sharing options...
Premium Member Bernie O'Doherty Posted November 16, 2009 Premium Member Share Posted November 16, 2009 The oil layer is most likely coming from the lens interior. Perhaps a technician used too much lubrication in the interior at one time. He also may have used the wrong viscosity level. See if you can find a good lens technician in your country and have him (or her) disassemble and clean the interior thoroughly. A little lens grease goes a long way. Link to comment Share on other sites More sharing options...
Hercules Fu Posted November 17, 2009 Author Share Posted November 17, 2009 The oil layer is most likely coming from the lens interior. Perhaps a technician used too much lubrication in the interior at one time. He also may have used the wrong viscosity level. See if you can find a good lens technician in your country and have him (or her) disassemble and clean the interior thoroughly. A little lens grease goes a long way. But all the lenses were in good conidtion in HongKong, i double check them one by one, is that cause by temperature change? Link to comment Share on other sites More sharing options...
Russell Richard Fowler Posted November 17, 2009 Share Posted November 17, 2009 I had similar problems from a lens that had just been serviced. The cabin pressure change during flight, which make your ears pop, was enough to have the lens lubricant creep. quote name='Hercules Fu' date='Nov 16 2009, 06:56 PM' post='306061'] But all the lenses were in good conidtion in HongKong, i double check them one by one, is that cause by temperature change? Link to comment Share on other sites More sharing options...
Olex Kalynychenko Posted November 19, 2009 Share Posted November 19, 2009 The oil layer is most likely coming from the lens interior. Perhaps a technician used too much lubrication in the interior at one time. He also may have used the wrong viscosity level. See if you can find a good lens technician in your country and have him (or her) disassemble and clean the interior thoroughly. A little lens grease goes a long way. I support of this idea, but, the owner do not say any about full name of lens, fix or zoom and other. It's a metal body or plastic body of lens ? If we told about prime lens the lens must have waterproof front and rear optical blocks before and after aperture mechnaism. The mechanism of aperture control can be re-lube and oil can ingress on glass surface. My other idea - moist (humid air) inside waterproof optical block. But, it's can be , if you carry lens from cold ( -5..10 C ) to indoor. Yes, of course, need optical technician for inspect of lens. If this oil on glass surface, need professional optical cleaning and do not destroy of MC. Link to comment Share on other sites More sharing options...
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