Hi Earl,
Thank you for your comments.
In my work, placing commercially available lens with clients that need certain tasks accomplished, the following AF lens have been very good performers:
28mm F/2.8 FA, 50mm F/1.4 FA, 85mm F/1.4 FA and the 100mm F/2.8 FA macro. Over the years of production, few design changes were done including the coatings.
The newer A* and EDIF lens follow the older releases, but testing shows little if any advantage on most of these released. I do not emphasize lens "features" as much as I examine
lens performance issues. Most of my "user" Pentax collections are manual lens, with few exceptions for the upper end of the Penatx EDIF line up like the 300mm F/2.8 400mm F/4,and the 560F/5.6.
Beyond the 35mm format, I find the Pentax 645 and Pentax 6X7 lens offerings to be quite good, especially adapted to the DSLR format camera bodies.
The best lens that I own across all my collections are those that are manually controlled. The critical focus requirements for such lens is best met by manual focusing means. These lens are always shot wide open, so the DOF is limited depending upon the working distance and focal length, but with a precise point of focus, the resutts are excellent.
Best Regards, Mike
Last edited by PhotoMike; 06-18-2013 at 04:37 AM.
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