Check out 

http://www.cdegroot.com/archives/yashicacontax-slr/199905/msg00087.html 

for a summary of the collaboration between Pentax and Zeiss by someone paraphrasing a 
book by an Asahi historian. It provides some details about how the coatings and two or 
three lenses began as joint developments but went their separate ways 

The writer summarizes the optical differences between the two companies' 15/3.5 and 
28/2 lenses.

No word about OCLI here; Pentax and Zeiss are credited with developing the SMC and T* 
multicoatings.

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