A Site for Photographers by Photographers

Community > Forums > Medium Format > Zeiss T* coatings - what and...

Featured Equipment Deals

Nancy Borowick: Cancer Family, Ongoing Read More

Nancy Borowick: Cancer Family, Ongoing

When Photographer Nancy Borowick asked her parents if she could document their co-journey through cancer, they said yes, with no restrictions.

Latest Equipment Articles

Sony a6300-First Impressions Read More

Sony a6300-First Impressions

When Sony's invitation to spend a couple of days shooting with the new a6300 in Miami arrived via email, I didn't have to think twice before sending my RSVP. Announced in February and shipping this...

Latest Learning Articles

Macro Photography Slideshow Read More

Macro Photography Slideshow

*These are some of the highlights from our recent Macro Photography Contest!* Click the arrow to begin the slideshow. h1. William Banik "Bayou...

Zeiss T* coatings - what and when?

peter yardley , Jun 07, 2006; 06:05 p.m.

Any Zeiss/Optics experts out there?

I'm interested to know when T* coating appeared on Zeiss lenses, and what is supposed to be so special about it?

obviously they had coated lenses before, single then multi coated, and then they must have branded this multi coating T* - but when was this (1978? 1982?) and what does it amount to?

I've heard some hassleblad experts say the multi coated chrome lenses were the ultimate from Zeiss (rather than the later black finish ones). Is there any basis for this, or is is just Quality Control reaching its peak in the late 70's and going down slightly in the 80's?



Meryl Arbing , Jun 07, 2006; 06:58 p.m.

From what I have found the first T ('Transparent') coating was developed in 1935. It allowed light transmission of 80% compared to uncoated lenses. This led to further development for the military during the war (the NR coating). The T* coating (which was an improved T coating and transmitted 90% of the light passing through it) appeared in 1990.


Bob The Builder , Jun 07, 2006; 07:33 p.m.

It is the same as multi-coating used by other brands. It reduces flare and improves contrast.

Anthony Oresteen , Jun 07, 2006; 11:40 p.m.

Here's my understanding of the T* coatings. T* coatings were introduced in the fall 1972 with no fanfare. It was Zeiss's multicoating process. In 1974 Zeiss started marketing "T*" as a reaction Pentax's SMC (Super Multi Coated) lens ads.

Chrome Hasselblad lenses made in late 72 and 73 are T* though not marked. Early black C lenses are T* but not marked. My understanding is that in late 73/early 74 Zeiss started marking Hasselblad lenses as "T*". There are chrome C lenses that are marked T*. I have only seen this on a 80mm lens.

In 1982 while I was in Germany I spoke with the Zeiss factory about my chrome 250 Sonnar. I was told that it was a 1973 vintage lens and it was T* coated but not marked as such.

Stuart Richardson , Jun 07, 2006; 11:54 p.m.

Yeah, it all goes down to Pentax's decision to come out and declare their multicoating as a big deal. I was talking to our local Leica rep (who is German from Wetzlar and has worked there 30 years) that Leitz was using multicoating on certain lenses since the 40s, but it never occurred to them to tell anyway. He chalked it up to the general tendency of the Japanese companies to be much better at marketing innovation, while the older German mentality was to let the products speak for themselves. For better or for worse, products don't always speak for themselves, even if they are better... (see VHS winning over Beta etc). I am not trying to argue that German products or better or anything like that, just that their method of marketing was different, and multicoating was one of the areas where this came to the fore.

Stuart Richardson , Jun 07, 2006; 11:55 p.m.

"tell anyway" should be tell ANYONE...sorry.

Simon Platt , Jun 08, 2006; 05:12 a.m.

The reason that Zeis refers to its coatings as T* is related to its cinema and movie film lenses. The advent of the coating called T* was the first time that a movie lens could be made where the mathematical aperture F number was the same as the actual light transmission T stop. From the introduction of the T* coating the losses through the glass were reduced almost to zero and T stops and F numbers became almost interchangeable. I say almost because for really critical exposure matching T stops are still used.

The history of Zeiss inovations and improvements tends to be a gradual process without a lot of marketing hype to push the change. that is why there are some T* lenses still marked as T. In much tghe same way that there are some Hasselblad 500 series cameras with older model identification marks than the actual camera would suggest. I.E the new model with an old badge on it

peter yardley , Jun 11, 2006; 10:01 a.m.

thank you for some very interesting information and answers.

I have an LF Zeiss Planar from the 70's that looks multi coated, but isn't branded T*. it is serial # 5793860 - is there a way to find out its date of manufacture?

Dan Fromm , Jun 11, 2006; 12:41 p.m.

Peter, per the Vade Mecum 1969-'71. For a narrower range of dates, find a kind person who has a copy of Hartmut Thiele's list, based on Zeiss factory production records. Or buy one y'rself. Not a multicoated lens.

peter yardley , Jun 11, 2006; 06:44 p.m.

Thanks to someone who does own the Thiele book, for their off list contact. It is actually 1975 production, and is multicoated, but not T* branded.

Back to top

Notify me of Responses