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What's in a Zeiss lens?

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chin:
The technical specifications of this Zeiss lens says 17 elements in 13 groups. I can clearly see 2 or 3 glasses still inside the core. Does each glass count as one element? Is each moving part of the barrel counted as one element?

The largest glasses, which I think could be the most expensive components and where the Zeiss name matters, are not included in this core. I assume they were reused in the fixed lens. I can only imagine that those large glasses cost a lot and if replaced, the cost would be even higher.

The above pictures were taken with the now fixed lens. It seem focusing quite correctly. I will found out next week in my trip to Yixing.

(BTW the full name of this lens is "Carl Zeiss Vario-Sonnar T* 24-70 F2.8 ZA SSM  SAL-2470Z"  :o  ::))

kai:
Chin, I strongly agree with your action.  This is very reasonable and absolutely is your right.  I always don't believe these companies, charging unreasonably high (just like some car companies do).  At large aperture value, there is always focusing problem.  When you lower the aperture by 1-2 stops, problem will be solved.  Does your camera has the function of adjusting the focusing point?  I usually adjust it a little bit front or backward when I have such problem. 

chin:

--- Quote from: kai on 21 October 2010, 21:19:48 ---Chin, I strongly agree with your action.  This is very reasonable and absolutely is your right.  I always don't believe these companies, charging unreasonably high (just like some car companies do).  At large aperture value, there is always focusing problem.  When you lower the aperture by 1-2 stops, problem will be solved.  Does your camera has the function of adjusting the focusing point?  I usually adjust it a little bit front or backward when I have such problem. 

--- End quote ---

The problem was more than the usual lost of sharpness at large aperture. The image was shaky. The following picture was the one of a few that made me suspect maybe problem with the lens. At F2.8, 1/80, ISO250, I think the quality should be much better.

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