Originally posted by Arjay Bee My representative > 12 blade lens is the Isco gottengen Tele Westanar 135 f3.5 m42 fully manual lens with 14 blades. (Closest focus is only 4.5ft but focus throw is about 340degrees and silky smooth.)
Example image:
Focus is one of the things that I like and dislike with the presets.
Most, mine included, have very smooth and precise 300 degree plus focusing throw, but also a very restrictive (for some people) minimum focus distances in the 5-6 feet range.
I have a perfect "toy" to deal with that issue, made odly enough by asahi optical co., called a focusing helix. It is a variable length extension tube adjustable from 15 to 30 mm with an integral focusing helix for close up work with longer lenses.
it was part of the $50 package that included my SMC Tak 135 F3.5, and a multicoated tamron 2x M42 teleconverter, plus Pentax skylight and polarizing 49mm filters
as an aside comment, how well is the aperture of you r lens working, I ask because it looks like one of the blades is not closing down uniformly with the others. Hope it is nothing serious