Thanks for that good resource for those who are interested.
Originally posted by Douglas_of_Sweden The APS-C fisheye zoom DA 10-17mm was designed by the same Jun Hirokawa and his colleague at Pentax, Mr. Takayuki Ito, patented in 2008. Tokina, nor any other company helped with the development. That was 2 years before Hoya "retired" Jun Hirokawa.
So it is something of a tradition by Pentax to have a fisheye zoom.
I guess you will have to correct the Pentax forums review?
"The SMC Pentax-DA 10-17mm F3.5-4.5 Fish-Eye ED [IF], which was released in early 2006, is the first and only Pentax fish-eye lens designed exclusively for APS-C format Pentax K-mount cameras. This is one of the lenses that Pentax developed in conjunction with Tokina, who currently offer the same lens for Canon and Nikon."
Just one thing. Is it unusual for a lens to be patented some time after its introduction or is the PF review incorrect on the introduction date too?