(URL: http://www.youtube.com/watch?v=oFBnraiK0A0)Via http://forum.pentaxfans.net/thread-124538-1-1.html(in Traditional Chinese)The user tested 17 lenses, first a K135 lens for the MF focus peaking beforehand, and then the other 16 AF lenses in K-mount (13 Pentaxes, 3 Sigmas) for speed and check the performance and reliability. At the very beginning of the test video, a side-by-side physical
