Here is an excellent article by Mr. Peter Zheng, very informative:-
http://forum.xitek.com/showthread.php?threadid=655516
(Text in Simplified Chinese, another reposted full version in Traditional Chinese can be found Here)
The article contains all the essential details for the patents and optical designs used by various new Pentax digital lens models, namely, DA* 16-50, DA* 50-135, DA 10-17, DA 35 Macro, DFA 50 Macro. In fact, Tokina has never had any patent of any lens design at all! Yes, nothing. So, what was that old Pentax-Tokina lens "co-development" actually about??
Peter, Well Done! Bravo and My Thumb Up! Please do continue to keep up the good works in the future!
Wednesday, August 19, 2009
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Raphael · 813 weeks ago
Guest · 812 weeks ago
Got that right. This cooperation is (or was) more a financial than a technical one: Pentax gets more money to fund the developpement of lens products, while Tokina save on both cost and time by not having to develop the lenses themselves.
And yes, the 12-24 is a Tokina design, just like the 18-270 is a Tamron design. If think the first was made in the Pentax-Tokina cooperation (but the other way around), while the second is just a relabeled Tamron lens with the added Pentax SMC.