On 3/03/06 5:24 PM, "Sylwester Pietrzyk", <[EMAIL PROTECTED]> wrote:
> Isn't info at the bottom of this official information from Tokina: > http://www.tokina.co.jp/news/pie2006news.html > that only optical formulas are jointly developed by both > manufacturers but mechanics and all the rest are made individually? Hi Sylwek, My initial post on this, which was based on the post by a Pentax lens designer in Japan explicitly said that Pentax either give the optical design to Tokina or vice versa, but there is NO joint development of the spec. Component wise, either one packages other's optical design. Tokina's statement is somewhat confusing to me, but they are also clear that this is not an OEM arrangement. So far, I do not think any optical specs were "jointly" developed. It appears that they take either design. But I can confirm it later. > also doubt if DFA 100 was developed by Tokina as it has FREE > originally developed and used by Pentax (previously in A and FA > 100/2.8 macro). I never said that DFA Macros were developed by Tokina. They were developed by Pentax, but FA Macros were so expensive to make and Pentax were losing money for each of those sold. I posted this info some months ago. Their solution was to give the lens optical spec to Tokina, and Tokina in turn packaged it to produce the more competitive products while keeping the same performance (thus the change from metal barrel to plastic, for one thing? :-). Cheers, Ken
