Bart1992
Newbie
Hello,
inside my Cardinar, around internal lens there is something like yellow irregular patches of grease or oil (?). Am I right that this is some grease leakage inside my lens or is it something else?
Regards
Bart
inside my Cardinar, around internal lens there is something like yellow irregular patches of grease or oil (?). Am I right that this is some grease leakage inside my lens or is it something else?
Regards
Bart
Jockos
Well-known
Could be separation. Is it only at the edges?
Bart1992
Newbie
Yes, these "patches" are only at the edges, all around.
Jockos
Well-known
Well, it shouldn't affect the image quality yet, shoot with it until it's done or you get tired 
Bart1992
Newbie
Thanks a lot.
Is it possible for this defect to get worse over time when the lens is used and stored in right conditions?
Is it possible for this defect to get worse over time when the lens is used and stored in right conditions?
Jockos
Well-known
If it's separation, it'll get worse yes. Make sure not to knock it around.
Bart1992
Newbie
Many thanks for your comments!
Bart1992
Newbie
I visited the camera repair shop today. Guy couldn't see at all what I mean for a long time, because "changes" can be seen only at a specific angle. Generally reassured me that it's nothing dangerous.
It is very strange thing. I looked at this more closely. When looking into the interior of the lens in front of it you can't see anything. The lenses are perfectly clean. These golden, shiny "flaws" can be seen only at a specific angle and generally aren't easy to see.
When looking into the interior of the lens from the mount side you can see yellow, matt area around the lens, but not on the lens, beneath them. It looks like brass with paint stripped off. At the yellow area here and there are black spots - as if at this area the blackening was partially wiped.
I'm probably too touchy. It remains to take pictures and enjoy a lens.
PS Sorry for my English...
It is very strange thing. I looked at this more closely. When looking into the interior of the lens in front of it you can't see anything. The lenses are perfectly clean. These golden, shiny "flaws" can be seen only at a specific angle and generally aren't easy to see.
When looking into the interior of the lens from the mount side you can see yellow, matt area around the lens, but not on the lens, beneath them. It looks like brass with paint stripped off. At the yellow area here and there are black spots - as if at this area the blackening was partially wiped.
I'm probably too touchy. It remains to take pictures and enjoy a lens
.PS Sorry for my English...
R
rick oleson
Guest
Symptoms of lens separation: there is (virtually) no reflection at a cemented glass/glass surface, but if the glue separates, about 8% of the light will be reflected back from that area (4% from each of the 2 glass surfaces that separated). This is invisible when looking THROUGH the lens, but when looking into it with bright light behind you, the separated spot looks bright and silvery. This does not affect the sharpness of the lens; it does reduce contrast somewhat in that part of the lens, especially in bright light; a lens hood will help. It will get gradually worse over time. The cosmetic effect is greater than the photographic effect.
Black & brass or gray patches around the edges: The ground edges of the lens elements are painted black during manufacture, again to prevent stray reflections and increase contrast. With age, this paint often begins to flake off or just separate slightly from the glass. Where the paint has separated from the glass, the glass surface will (usually) appear light gray like a groundglass surface, and where the paint is still bonded to the glass it will appear black, so you may see some blotchiness as this progresses. The effect of this is not too different from separation, it introduces stray light into the lens and reduces contrast. If the barrel is brass, you might see some of the brass color through this edge area of the lens. This is generally less serious of a problem than separation, mainly because it's fixable with some black paint. The effect is minor in terms of imaging, and can be improved by using a lens hood.
Black & brass or gray patches around the edges: The ground edges of the lens elements are painted black during manufacture, again to prevent stray reflections and increase contrast. With age, this paint often begins to flake off or just separate slightly from the glass. Where the paint has separated from the glass, the glass surface will (usually) appear light gray like a groundglass surface, and where the paint is still bonded to the glass it will appear black, so you may see some blotchiness as this progresses. The effect of this is not too different from separation, it introduces stray light into the lens and reduces contrast. If the barrel is brass, you might see some of the brass color through this edge area of the lens. This is generally less serious of a problem than separation, mainly because it's fixable with some black paint. The effect is minor in terms of imaging, and can be improved by using a lens hood.
Larry H-L
Well-known
Doesn't look like separation to me, but it is difficult to tell from photos. I think you are seeing where the edges of the glass touches the side of the barrel, and paint/cement.
Whatever it is, (if indeed a flaw) it is very minor and unlikely to affect your photos.
Whatever it is, (if indeed a flaw) it is very minor and unlikely to affect your photos.
