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Fandyus
Joined: 12 Apr 2020
Posts: 108
Location: Czechia
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 Posted: Mon Jul 13, 2020 2:53 am Post subject: Auto Revuenon 55mm f/1.7 - is this fungus? |
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Fandyus wrote:
I recently got my hands on this dirt cheap lens on a flea market, it cost roughly 9€. I don't know why I didn't realize this sooner but the glass is dirty, like really dirty. I shone a flashlight through it today and it looks like this. Is this fungus? And if so, how much does it spread, should I keep this lens as far away as possible from my other lenses? Should I wash my hands after I handle it and go touch other lenses? The optical performance is actually surprisingly good besides low contrast, so I don't exactly want to ditch it.
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Oldhand
Joined: 01 Apr 2013
Posts: 6000
Location: Mid North Coast NSW - Australia
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| Posted: Mon Jul 13, 2020 6:45 am Post subject: |
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Oldhand wrote:
It does not look like fungus to me, more like balsam separation between cemented elements I think.
There are a couple of deep looking scratches as well.
It is a pity, as the Auto Revuenon 55mm f1.7 is an excellent lens
Tom |
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Sciolist
Joined: 29 Mar 2017
Posts: 1445
Location: Scotland
Expire: 2021-04-16
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| Posted: Mon Jul 13, 2020 9:06 am Post subject: |
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Sciolist wrote:
As Tom says, it looks like balsam separation. So it's not a fungus. If the lens still works for you, then enjoy. |
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Pancolart
Joined: 04 Feb 2008
Posts: 3704
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Mon Jul 13, 2020 11:07 am Post subject: |
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Pancolart wrote:
Could also be sort of haze, perhaps even cleanable.
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planet.groove
Joined: 20 Apr 2016
Posts: 73
Location: Berlin, Germany
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| Posted: Mon Jul 13, 2020 1:33 pm Post subject: |
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planet.groove wrote:
hi,
in this lens, usually this kind of dirt or haze or whatever it is, is between the front group and the rear group where the aperture is. just unscrew the rear block (it is easy) and you can clean it.
on the other side, the circular scratches(?) are strange. maybe someone tried a cleaning some time ago.
good luck!
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Mon Jul 13, 2020 2:50 pm Post subject: |
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Gardener wrote:
Looks like total loss to me. |
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Fandyus
Joined: 12 Apr 2020
Posts: 108
Location: Czechia
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| Posted: Mon Jul 13, 2020 10:33 pm Post subject: |
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Fandyus wrote:
| Oldhand wrote: |
It does not look like fungus to me, more like balsam separation between cemented elements I think.
There are a couple of deep looking scratches as well.
It is a pity, as the Auto Revuenon 55mm f1.7 is an excellent lens
Tom |
Thanks. I have no idea what those lines are either. You think they're scratches? At least they don't show up in the images. And yeah the lens is actually very sharp even on my 24mp APS-C. I'm probably gonna shoot some floral portraits with it soon. |
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Fandyus
Joined: 12 Apr 2020
Posts: 108
Location: Czechia
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| Posted: Mon Jul 13, 2020 10:34 pm Post subject: |
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Fandyus wrote:
| Sciolist wrote: |
| As Tom says, it looks like balsam separation. So it's not a fungus. If the lens still works for you, then enjoy. |
It does work fine, I'm planning to use it, thanks. But may I ask what is balsam separation? Hope it's not annoying to explain. |
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Fandyus
Joined: 12 Apr 2020
Posts: 108
Location: Czechia
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| Posted: Mon Jul 13, 2020 10:36 pm Post subject: |
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Fandyus wrote:
| Pancolart wrote: |
| Could also be sort of haze, perhaps even cleanable. |
Dunno, I'm afraid to open the lens as to not date the elements or decenter the system. |
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Fandyus
Joined: 12 Apr 2020
Posts: 108
Location: Czechia
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| Posted: Mon Jul 13, 2020 10:38 pm Post subject: |
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Fandyus wrote:
| planet.groove wrote: |
hi,
in this lens, usually this kind of dirt or haze or whatever it is, is between the front group and the rear group where the aperture is. just unscrew the rear block (it is easy) and you can clean it.
on the other side, the circular scratches(?) are strange. maybe someone tried a cleaning some time ago.
good luck! |
Honestly, I don't know how to open lenses and I'm really scared of decentering the lens if I dig around in it. I have no idea what the circular lines are either. I was thinking it could be from a sudden heat change but everyone here says scratches. |
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Fandyus
Joined: 12 Apr 2020
Posts: 108
Location: Czechia
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| Posted: Mon Jul 13, 2020 10:39 pm Post subject: |
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Fandyus wrote:
| Gardener wrote: |
| Looks like total loss to me. |
It wasn't that expensive, and the way I shot the image makes it look filthier than it is under normal conditions. Plus the lens actually works completely fine, the contrast is just really bad wide open. |
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jamaeolus
Joined: 19 Mar 2014
Posts: 2965
Location: Eugene
Expire: 2015-08-20
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| Posted: Mon Jul 13, 2020 11:06 pm Post subject: |
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jamaeolus wrote:
It looks like it might be chemical degradation of the coating. Maybe after condensation. Not sure about the circular "scratches" If its in the front lens block you will get a little degradation of contrast and increased flair. The closer it is to the back of the back element the more degradation you are likely to see.
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visualopsins
Joined: 05 Mar 2009
Posts: 10962
Location: California
Expire: 2025-04-11
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| Posted: Mon Jul 13, 2020 11:17 pm Post subject: |
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visualopsins wrote:
The harshest test shining flashlight torch across rear element looking into front...
Looks like leftovers from fungus cleaning, separation, coating degradation, moisture residue, evaporated helical grease, cleaning marks, any of those, any combination, or all.
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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vivaldibow
Joined: 23 Jun 2018
Posts: 841
Expire: 2021-03-09
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| Posted: Tue Jul 14, 2020 12:36 am Post subject: |
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vivaldibow wrote:
| visualopsins wrote: |
The harshest test shining flashlight torch across rear element looking into front...
Looks like leftovers from fungus cleaning, separation, coating degradation, moisture residue, evaporated helical grease, cleaning marks, any of those, any combination, or all. |
Agreed. Could be a combination of all sorts of things. For 9Euro around $10, I would keep it and try to clean it as a practice. |
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Mike Deep
Joined: 25 Oct 2008
Posts: 319
Location: Upstate New York
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| Posted: Tue Jul 14, 2020 3:04 pm Post subject: |
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Mike Deep wrote:
Looks like a lot of everything to me. It will probably clean up. But those distinct lines are scratches, those aren't going anywhere.
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Rocket Launch Photography
Olympus: 24/2.8 MC, 28/3.5, 28/2.8 MC, 35/2.8, 50/3.5, 50/1.8 MC, 50/1.4 MC, 35-70/3.6, 75-150/4
Nikon: C 24/2.8, AI-S 28/2.8, K 35/2.8, F 55/3.5, C 55/1.2, 105/2.5 (5/3), 105/2.5 (5/4), F 135/2.8, F 200/4, No. 5T
Pentax: 28/3.5, 35/3.5, 50/1.4 (8/6), 50/1.4 (7/6), M 50/1.4, SMC 55/1.8, 105/2.8, SMC 135/3.5, 150/4
Tamron: SP 17/3.5 151B, 28/2.5, 135/2.8 T-135, SP 300/2.8 60B, SP 35-80/2.8-3.8 01A, 80-210/3.8-4 103A, SP 1.4x TC 140F, SP 2x TC 01F
Vivitar: 24/2 (Kino), 28/2 (Kino), 50/1.4 (Cosina), S1 90/2.5 (Tokina), S1 28-80/2.8-3.5 (Kino), 70-150/3.8 (Kino), S1 70-210/3.5 (Kino), 2x Macro TC
Etc: Yashica 3.5cm/2.8, Fujinon 50/1.4, Yashica ML 50/1.4, Tomioka Yashinon 55/1.2, Mamiya/Sekor 55/1.7, Sigma 90/2.8
That's a lot of 50s. |
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KEO
Joined: 27 Sep 2018
Posts: 773
Location: USA
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| Posted: Tue Jul 14, 2020 6:23 pm Post subject: |
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KEO wrote:
Yes, that's a lens I would try to clean. It looks like a lot of general haze and gunk to me, which may or may not be cleanable. It might simply wipe away, but there's only one way to find out. |
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