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WNG555
Joined: 18 Dec 2014
Posts: 784
Location: Arrid-Zone-A, USA
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 Posted: Mon Feb 08, 2016 2:00 am Post subject: Is the Super Takuma 35mm f/2 radioactive? |
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WNG555 wrote:
Been wanting something faster than f/3.5 and f/2.8 in a vintage 35mm.
I just received a copy of this lens that I found for a decent price.
It's in excellent physical condition, with the exception that some previous owner drilled two holes into the face plate in order to be able to unscrew it.
Hence the good price, not for the diehard collecor.
Upon inspecting it, there was a hint of haze, but what stood out was how yellow the lens appeared. Just like some 55mm f/1.8 and f/1.4 models that are yellowed from the Thorium.
Shots with it today in afternoon sunlight were excessively yellow. Unlike my other Super Taks.
I'm not aware of this model being radioactive like their 55s. Is it?
Mine is the 2nd version with the 49mm dia. filter, and 1967->.
Can the Takumar enthusiasts and experts shed some light on this model?
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"The eyes are useless when the mind is blind."
Sony ILCE-6000, SELP1650, SEL1855, SEL55210, SEL5018. Sigma 19/30/60mm f2.8 EX DN Art.
Rokinon 8mm f3.5 Fish-Eye, 14mm f2.8 IF ED UMC. Samyang 12mm f2.8 ED AS NCS Fish-Eye.
And a bunch of Manual-Focus Lenses
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calvin83
Joined: 12 Apr 2009
Posts: 7555
Location: Hong Kong
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| Posted: Mon Feb 08, 2016 3:38 am Post subject: |
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calvin83 wrote:
I have see plenty of Super Takumar 35/2 with 49mm filter become yellowed in eBay. My v1 with 67mm filter does not have this problem.
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WNG555
Joined: 18 Dec 2014
Posts: 784
Location: Arrid-Zone-A, USA
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| Posted: Mon Feb 08, 2016 4:10 am Post subject: |
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WNG555 wrote:
Appears the v2 is indeed radioactive. Assumed it would be like the v1.
Hopefully it'll respond favorably to UV treatments.
_________________
"The eyes are useless when the mind is blind."
Sony ILCE-6000, SELP1650, SEL1855, SEL55210, SEL5018. Sigma 19/30/60mm f2.8 EX DN Art.
Rokinon 8mm f3.5 Fish-Eye, 14mm f2.8 IF ED UMC. Samyang 12mm f2.8 ED AS NCS Fish-Eye.
And a bunch of Manual-Focus Lenses
My Flickr |
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FotoPete
Joined: 20 Nov 2012
Posts: 126
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| Posted: Tue Apr 12, 2016 2:52 am Post subject: |
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FotoPete wrote:
I second the 35mm Tak f2 (49mm variants) being radioactive. It seems to take quite a bit longer to clear up too vs the super tak 50 f1.4. Not sure if that is an effect of aperture too.
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WNG555
Joined: 18 Dec 2014
Posts: 784
Location: Arrid-Zone-A, USA
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| Posted: Tue Apr 12, 2016 5:41 am Post subject: |
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WNG555 wrote:
| FotoPete wrote: |
| I second the 35mm Tak f2 (49mm variants) being radioactive. It seems to take quite a bit longer to clear up too vs the super tak 50 f1.4. Not sure if that is an effect of aperture too. |
I noticed that too. Mine was quite yellowed. I've put it away until a stronger UV source can be obtained to deal with it. It wasn't that good a performer anyway, so it's back to my 35mm f/2.8 lenses.
_________________
"The eyes are useless when the mind is blind."
Sony ILCE-6000, SELP1650, SEL1855, SEL55210, SEL5018. Sigma 19/30/60mm f2.8 EX DN Art.
Rokinon 8mm f3.5 Fish-Eye, 14mm f2.8 IF ED UMC. Samyang 12mm f2.8 ED AS NCS Fish-Eye.
And a bunch of Manual-Focus Lenses
My Flickr
Last edited by WNG555 on Tue Apr 12, 2016 10:22 pm; edited 1 time in total |
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Tue Apr 12, 2016 8:14 am Post subject: |
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Gardener wrote:
I've bought a couple over the years. Both were very yellow, but responded to UV light better than 50/1.4.
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Roka
Joined: 18 Mar 2016
Posts: 133
Location: Phoenix, AZ
Expire: 2017-04-07
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| Posted: Tue Apr 12, 2016 11:12 pm Post subject: |
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Roka wrote:
Is that the same lens as the SMC Takumar 35mm f/2? I have that lens and haven't noticed any yellowing.
And as to the subject of yellowing radioactive lenses, anyone know WHY they yellow? Is it the actual glass or the coatings that yellow? And why does a UV light clear it up? Just wondering.
_________________
Camera
Fujifilm X-T20
Lenses
Vivitar 55mm f/2.8 Macro (1:1)
Canon FD 200mm f/4
Canon FD 300mm f/5.6
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John Shriver
Joined: 24 Dec 2009
Posts: 198
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| Posted: Wed Apr 13, 2016 2:36 am Post subject: |
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John Shriver wrote:
It's the glass. The radioactive particles emitted by the decay chain of the Thorium in the glass cause the glass to turn brown.
This is the reason that all the data collected in the colliders at CERN travels over copper cables, not fiber. |
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tromboads
Joined: 29 May 2012
Posts: 1655
Location: Melbourne AU
Expire: 2015-10-01
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| Posted: Wed Apr 13, 2016 3:03 am Post subject: |
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tromboads wrote:
that bit about CERN is interesting. |
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Roka
Joined: 18 Mar 2016
Posts: 133
Location: Phoenix, AZ
Expire: 2017-04-07
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| Posted: Wed Apr 13, 2016 5:46 am Post subject: |
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Roka wrote:
| John Shriver wrote: |
It's the glass. The radioactive particles emitted by the decay chain of the Thorium in the glass cause the glass to turn brown.
This is the reason that all the data collected in the colliders at CERN travels over copper cables, not fiber. |
Thanks for answering this. And as already noted the tidbit about data collection at CERN is very interesting!
_________________
Camera
Fujifilm X-T20
Lenses
Vivitar 55mm f/2.8 Macro (1:1)
Canon FD 200mm f/4
Canon FD 300mm f/5.6
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visualopsins
Joined: 05 Mar 2009
Posts: 10957
Location: California
Expire: 2025-04-11
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| Posted: Wed Apr 13, 2016 5:08 pm Post subject: |
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visualopsins wrote:
| Roka wrote: |
Is that the same lens as the SMC Takumar 35mm f/2? I have that lens and haven't noticed any yellowing.
And as to the subject of yellowing radioactive lenses, anyone know WHY they yellow? Is it the actual glass or the coatings that yellow? And why does a UV light clear it up? Just wondering. |
There is no SMC Takumar 35mm f/2. 35/2 Takumar must be Super-Takumar or Super-Multi-Coated Takumar (also abbreviated S-M-C, to distinguish from later lenses with "SMC" written on namering rather than "Super-Multi-Coated".
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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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Roka
Joined: 18 Mar 2016
Posts: 133
Location: Phoenix, AZ
Expire: 2017-04-07
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| Posted: Wed Apr 13, 2016 7:10 pm Post subject: |
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Roka wrote:
| visualopsins wrote: |
| Roka wrote: |
Is that the same lens as the SMC Takumar 35mm f/2? I have that lens and haven't noticed any yellowing.
And as to the subject of yellowing radioactive lenses, anyone know WHY they yellow? Is it the actual glass or the coatings that yellow? And why does a UV light clear it up? Just wondering. |
There is no SMC Takumar 35mm f/2. 35/2 Takumar must be Super-Takumar or Super-Multi-Coated Takumar (also abbreviated S-M-C, to distinguish from later lenses with "SMC" written on namering rather than "Super-Multi-Coated". |
You're right. Mine is labeled "Super-Multi-Coated" making it the "S-M-C" version. Now I need to update my lens list to reflect that. 
_________________
Camera
Fujifilm X-T20
Lenses
Vivitar 55mm f/2.8 Macro (1:1)
Canon FD 200mm f/4
Canon FD 300mm f/5.6
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