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spiralcity
Joined: 02 Oct 2008
Posts: 1207
Location: Chicago, U.S.A
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 Posted: Wed Oct 22, 2008 5:11 pm Post subject: CARL ZEISS JENA BIOTAR 58/2 (RED T)* ???????? |
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spiralcity wrote:
I have a question about the (Red T) marking; what does it represent?
CARL ZEISS JENA BIOTAR 58/2 (RED T)*
I know it has a significance, I just dont know what it is.
Any input would be appreciated.
Thanks,
Kevin |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Wed Oct 22, 2008 5:13 pm Post subject: |
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Attila wrote:
Famous coating by Carl Zeiss Jena.
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spiralcity
Joined: 02 Oct 2008
Posts: 1207
Location: Chicago, U.S.A
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| Posted: Wed Oct 22, 2008 5:34 pm Post subject: |
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spiralcity wrote:
| Attila wrote: |
| Famous coating by Carl Zeiss Jena. |
(Red T) is just a coating mark?
Thanks Attila |
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bob955i
Joined: 15 Apr 2007
Posts: 2495
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| Posted: Wed Oct 22, 2008 5:40 pm Post subject: |
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bob955i wrote:
"Transparenz" |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Wed Oct 22, 2008 5:53 pm Post subject: |
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Attila wrote:
Yes, Red T is a coating mark only.Some lens perform better without T than with T 
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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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no-X
Joined: 19 Jul 2008
Posts: 2495
Location: Budejky, Czech Republic
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| Posted: Wed Oct 22, 2008 8:25 pm Post subject: |
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no-X wrote:
Aren't some "T" lenses equipped by more aperture blades?
Biotar 58/2 non-T: 10 blades
Biotar 58/2 T: 12 blades...
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Wed Oct 22, 2008 8:29 pm Post subject: |
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Attila wrote:
I suppose T means only coating. Perhaps means premium level ?!
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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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no-X
Joined: 19 Jul 2008
Posts: 2495
Location: Budejky, Czech Republic
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| Posted: Wed Oct 22, 2008 8:31 pm Post subject: |
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no-X wrote:
I think so.
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Throndor
Joined: 15 Sep 2008
Posts: 157
Location: Ankara / TURKEY
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| Posted: Wed Oct 22, 2008 9:08 pm Post subject: |
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Throndor wrote:
Our engineers demand the unimaginable from the highly-effective Carl Zeiss T* anti-reflective coating, a “package”, individually calculated and adjusted for each air-glass interface, consisting of up to nine layers per lens element surface. For all intents and purposes T* coating reduces contrast-reducing reflections to negligeable levels, resulting in almost 100% light transmission. The T* coating process has an additional mechanical function – it must permanently withstand all weather conditions. We test the resistance of the coating using mechanical abrasion tests and salt-mist exposure. We simulate the stress of “sandy” wind in the desert or on the beach, as well as the salt air from the ocean. We place T* coated lenses in boiling water to ensure that the coating does not lift. The T* coating is not just a pretty face!
from CZ website...
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Omer
Pentax K100D super
Pentax DA 18-55 AL
Pentax SMC-FA 50 f/1.4
Aus Jena Pancolar 50/1.8 (Zebra)
Carl Zeiss Jena Sonnar 135/3.5
Varexon 35/2.8
Helios 44-2 58/2
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Wed Oct 22, 2008 9:14 pm Post subject: |
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Attila wrote:
What you talk about that is T* coating started to make by Carl Zeiss Oberkochen. Genuine thread started by Carl Zeiss Jena T coating they are not same coating I believe at least
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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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bob955i
Joined: 15 Apr 2007
Posts: 2495
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| Posted: Wed Oct 22, 2008 9:19 pm Post subject: |
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bob955i wrote:
Orio knows more of this than me but IIRC the 'T' mark on older Zeiss lenses is short for "Transparenz" which back then just meant that the lens was coated.
The 'T*' designation on modern Zeiss lenses is not quite the same as the old 'T' mark since the coating technology itself is much more modern and improved (done in collaboration with Pentax IIRC) as one would expect.
Hence T* |
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spiralcity
Joined: 02 Oct 2008
Posts: 1207
Location: Chicago, U.S.A
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| Posted: Thu Oct 23, 2008 5:08 am Post subject: |
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spiralcity wrote:
Thanks everyone. 
I have my eye on the Biotar and I was curious about the 'T'. |
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