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Sirrith
Joined: 17 Sep 2010
Posts: 215
Location: Hong Kong
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 Posted: Sun May 13, 2012 12:29 pm Post subject: Pentacon electric 50 with weird mark on glass |
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Sirrith wrote:
Hi guys, I just went to a car boot sale with a friend and she picked up a pentacon electric 50/1.8 thats a little beat up (dent in filter ring, smaller dent in focus ring), and one very odd thing about it is that it seems to have a flower-like symbol/mark actually on one of the rear elements, either on the inner surface of the rear element, or on the second element in from the rearmost one. It doesn't look like a crack or anything of the sort, it almost looks like someone intentionally put it there, and its not on the edge, its a little bit just off the centre of the glass element. It looks a lot like the MSNBC logo, but a complete circle (the MSNBC logo is only a half-circle). I haven't got any pictures of it yet, but has anyone heard of or seen this before? I will try and post pictures sometime soon. |
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ManualFocus-G
Joined: 29 Dec 2008
Posts: 6624
Location: United Kingdom
Expire: 2014-11-24
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| Posted: Sun May 13, 2012 12:36 pm Post subject: |
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ManualFocus-G wrote:
Are you sure it's not a patch of fungus?
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Shooter of choice: Fujifilm X-T20 with M42, PB and C/Y lenses
See my Flickr photos at http://www.flickr.com/photos/manualfocus-g |
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Sirrith
Joined: 17 Sep 2010
Posts: 215
Location: Hong Kong
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| Posted: Sun May 13, 2012 12:49 pm Post subject: |
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Sirrith wrote:
| ManualFocus-G wrote: |
| Are you sure it's not a patch of fungus? |
Pretty sure, its transparent, part of the glass.
I thought it was fungus at first too until I took a better look. |
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Gurdie
Joined: 29 Jul 2008
Posts: 997
Location: Finland
Expire: 2013-02-20
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| Posted: Sun May 13, 2012 6:11 pm Post subject: |
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Gurdie wrote:
A lens grinding mark? I´ve seen those in eyeglasses.
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Markku
Give me two hours a day of activity, and I'll take the other twenty-two in dreams.
― Salvador Dali
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fuzzywuzzy
Joined: 18 Dec 2010
Posts: 1258
Location: Down East, Canada, eh?
Expire: 2013-11-30
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| Posted: Sun May 13, 2012 10:56 pm Post subject: |
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fuzzywuzzy wrote:
Does it look like this?
In my case the guess was element separation.
http://forum.mflenses.com/is-this-fungus-t46322.html
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I welcome C&C, editing my pics and reposting them on the forum is fine.
NEX-F3
~~~~~~~~~
CZJ Sonnar 135/4, Biotar 58/2, Pancolar 50/2, Tessar 50/2.8, Flek 35/2.8, Flek 25/4
Super Takumar 135/2.5, 135/3.5, 100/4 bellows, 50/1.4, 28/3.5
Helios 58/2, 3M-5A 500/8, Mir 20M
Vivitar Series 1 70-210 - - - - - - - - Nikkor 200/4
Rikenon 28/2.8 - - - - - - - - Zeiss 50/1.7 Planar
PB 50/2.4, 135/2.8
Yashica 50/1.9, 28/2.8, 135/2.8
Hexanon 28/3.5, 50/1.4 |
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Sirrith
Joined: 17 Sep 2010
Posts: 215
Location: Hong Kong
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| Posted: Mon May 14, 2012 7:25 am Post subject: |
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Sirrith wrote:
Yes, that is exactly it!
Can it really be element separation if two lenses have the same mark in the same spot? |
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IAZA
Joined: 16 Apr 2010
Posts: 2587
Location: Indonesia
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| Posted: Mon May 14, 2012 8:35 am Post subject: |
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IAZA wrote:
my pentacon 135/2,8 had it too, I thought it was oil
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Sirrith
Joined: 17 Sep 2010
Posts: 215
Location: Hong Kong
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| Posted: Mon May 14, 2012 10:57 am Post subject: |
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Sirrith wrote:
| IAZA wrote: |
| my pentacon 135/2,8 had it too, I thought it was oil |
Is it also the same shape? |
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Attila
Joined: 24 Feb 2007
Posts: 57849
Location: Hungary
Expire: 2025-11-18
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| Posted: Mon May 14, 2012 1:06 pm Post subject: |
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Attila wrote:
I saw in past too, no idea what is this.
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Items on sale on Ebay
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IAZA
Joined: 16 Apr 2010
Posts: 2587
Location: Indonesia
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| Posted: Mon May 14, 2012 1:08 pm Post subject: |
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IAZA wrote:
similar pattern, I sold it
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Sirrith
Joined: 17 Sep 2010
Posts: 215
Location: Hong Kong
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| Posted: Mon May 14, 2012 3:10 pm Post subject: |
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Sirrith wrote:
Was it also in the same location as that shown on the photos? Could it be some sort of ID mark do you think (anyone)? |
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Attila
Joined: 24 Feb 2007
Posts: 57849
Location: Hungary
Expire: 2025-11-18
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| Posted: Mon May 14, 2012 3:17 pm Post subject: |
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Attila wrote:
No id mark for sure I saw only once from hundred of East German items, I saw it on rare Meyer Domiron 2/50 lens
http://www.fotosbolt.com/objektiv-adapter-fenykepezogep-galeria/meyer-optik/domiron-50mm-f2-meyer-optik-gorlitz
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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