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shoey
Joined: 15 Feb 2009 Posts: 11
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Posted: Tue Aug 25, 2009 8:13 am Post subject: Is this fungus or glue separation? |
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shoey wrote:
Can anyone tell me if these spots is fungus or is it some sort of glue/paint separation? It only occurs on the rim where the element is glued to some black material...
And taken the front element out, photographed from the back - there appears to be a lot of dried/aged cracks in whatever the black stuff is...
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Tue Aug 25, 2009 8:45 am Post subject: |
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Spotmatic wrote:
I think it is some form of oxidation of the material, causing a slight separation. If this is limited to the masked-off parts, then it should not affect the pictures.
BTW, what lens is this? _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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shoey
Joined: 15 Feb 2009 Posts: 11
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Posted: Tue Aug 25, 2009 8:51 am Post subject: |
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shoey wrote:
thanks for the info
Its my Sigma 16mm filtermatic fisheye:
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Tue Aug 25, 2009 8:53 am Post subject: |
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Spotmatic wrote:
Do you already own it or are you planning to buy it? Any chance to test it out prior to a purchase? _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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kds315*
Joined: 12 Mar 2008 Posts: 16634 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Tue Aug 25, 2009 8:55 am Post subject: |
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kds315* wrote:
How would he have been able to take the front lens out otherwise??? _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
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Currently most FAV lens(es):
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Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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shoey
Joined: 15 Feb 2009 Posts: 11
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Posted: Tue Aug 25, 2009 9:17 am Post subject: |
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shoey wrote:
I already own it |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Tue Aug 25, 2009 9:21 am Post subject: |
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Spotmatic wrote:
kds315* wrote: |
How would he have been able to take the front lens out otherwise??? |
Yes, that's a stupid question. Somehow I got the impression that it was a lens for sale. Maybe I should visit eBay less often _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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Tim_Tomte
Joined: 06 Aug 2012 Posts: 43 Location: Germany
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Posted: Wed Nov 28, 2012 9:14 pm Post subject: |
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Tim_Tomte wrote:
it fits to the topic, so I'm digging this thread out:
is this fungus or glue??
_________________ NEX-6
Sigma 19mm, 30mm
and a bunch of old lenses |
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Drack
Joined: 27 Feb 2011 Posts: 735 Location: Lithuania
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Posted: Wed Nov 28, 2012 9:31 pm Post subject: |
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Drack wrote:
Tim_Tomte wrote: |
it fits to the topic, so I'm digging this thread out:
is this fungus or glue??
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I`m guessing that this is neither. Most of the elements of the lens have painted rears to reduce any sort of light deformations and over many year this layer of pains simply fades/erodes/falls away and you are left with what you have hear. _________________ I have many great Russian cameras and lenses for sale on my ebay account, please check it out: http://www.ebay.com/sch/piksius/m.html?_nkw=&_armrs=1&_from=&_ipg=25&_trksid=p3686
Forum members are olbigaded to a discount
DSLR: Pentax K-x + 18-55 kit + f4 35-75mm
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M42 lense: Helios 44-2 , Helios 44-3, Helios 44m , Tair 3 Phs , Mir-1B , Jupiter-37a, Industar 50-2, Industar 61 L/Z, Tlear-N .
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EXA 1A + CZJ Tessar f2.8/50mm |
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Orio
Joined: 24 Feb 2007 Posts: 29545 Location: West Emilia
Expire: 2012-12-04
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Posted: Wed Nov 28, 2012 10:37 pm Post subject: |
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Orio wrote:
Typically separation presents itself as a uniformly opaque and often yellowish coloured area, that starts from the edge in a continuous fashion, and expands towards the centre with an elongated roundish shape.
So, whenever you see spotted areas, whitish, and not consistent in density, and rather sparse, that should not be separation; it may not necessarily be fungus, however, although it's the most likely chance.
Fungus also often presents itself with ramification, that may be not visually identifyable at naked eye, but which usually becomes evident with a loupe. _________________ Orio, Administrator
T*
NE CEDE MALIS AUDENTIOR ITO
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Tim_Tomte
Joined: 06 Aug 2012 Posts: 43 Location: Germany
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Posted: Thu Nov 29, 2012 8:58 am Post subject: |
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Tim_Tomte wrote:
thank you ! _________________ NEX-6
Sigma 19mm, 30mm
and a bunch of old lenses |
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cyberjunkie
Joined: 24 Mar 2010 Posts: 282 Location: Chiang Mai, Bologna, Amsterdam
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Posted: Fri Nov 30, 2012 12:05 am Post subject: |
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cyberjunkie wrote:
[quote="Drack"]
Tim_Tomte wrote: |
it fits to the topic, so I'm digging this thread out:
is this fungus or glue??
I`m guessing that this is neither. Most of the elements of the lens have painted rears to reduce any sort of light deformations and over many year this layer of pains simply fades/erodes/falls away...
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From the picture i can't understand if it's something like the so called "schneideritis" (barrel blackening that swells/flakes), or a problem with the blackening of the outer rim of the glass/glasses (negative elements, with thick rim, are painted black on the edge, to prevent unwanted reflections).
Both problems are practically irrelevant, and can be considered just an aesthetical nuisance.
Reading the posts on (most) photographic forums, i found that there is a widespread and largely unwarranted scare of separations and fungal infections.
In my own experience, those problems are quite uncommon, even in very old optics.
Being a collector of vintage large format lenses, i know a thing or two about the matter.
Separation problems are very unlikely in lenses made after the early seventies, excluding problems due to shocks or extreme overheating.
Fungii can always be cleaned, in a way or another, but the coating (or the glass itself) can be etched by acids produced by the fungal growth. A repair is economical only with super-rare lenses... if you find somebody who will re-polish and /or re-coat the offended element.
The good news: if the lenses are not exposed to dirt (with fungal spores) AND moisture (i.e. you do care a little for them), the chances of getting a fungal growth on your glasses are almost nil.
I stored all my large format lenses, including some very valuable ones, in an extremely damp cellar for nearly 20 years: no traces of fungii, just a few "lazy" shutters.
have fun
CJ _________________ Pentax Bodies: 6x7, K2, MX, LX, Super A, Z-1, K-1, K-5 II, K-01, K10D, K200D
Other cameras: Leica CL, Leica M5, Rolleiflex, Mamiya Super 23, Horizont, and many bellows cameras from 4x5" to 8x10"
- Shooting only digital recently, FF and APS-C
- Collecting vintage large format lenses (plenty of them )
- Looking for Pentax-A* 200mm Macro and Pentax-A* 1.8/135mm, Sigma 150mm or 180mm Macro PK, Sigma 50-500 AF PK, Enna 1.5/85mm M42; selling Pentacon Six/Pentax 67/Mamiya Press/Leica M/Rolleiflex/4x5"/Manfrotto stuff
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ZoneV
Joined: 09 Nov 2009 Posts: 1632 Location: Germany
Expire: 2011-12-02
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Posted: Thu Dec 13, 2012 8:48 am Post subject: |
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ZoneV wrote:
I think Schneideritis will make MTF of the lens a bit worde because of more stray light. But this will be most likely an academic small amount of IQ that is lost.
I own a Rodenstock Rodagon 80/4 enlarger lens with delamination/separation, that is most likley from the 1980 or later.
After some research I found out that such Rodagons have this now and then. Found easily 10 internet sources:
Typical lens defects
I have a 50mm ~1.4 with delamination, don´t remember which manufacturer. But I would think it is also produced after early 1970.
On booth lenses I don´t know the history, but I remember no impact marks on the lenses.
I own a lot of lenses with fungus.
And I read a lot about lenses with fungus. For me it seems that fungus is a real problem for people living in hot humid areas. And for people who store lenses in closed bags or such long time - probably after photographing in humid enviroment. Later seems the problem here in Germany. I see a lot of lenses with fungus on flea markets. Sometimes it seems people do not reckognize fungus in their lens, some time it is hard too see, for example in wideangles or very early fungus. _________________ Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
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