That says it all. Either there was a focusing problem with all my
previous Pentax DSLRs or the sample variation in this one particular
lens is huge and bizarre.
I never noticed a large difference in focus at 70mm and at 210mm on the
two previous versions of this lens that I've owned, (there was a very
slight change with the second one I owned), but this one is quite
noticeably out of focus, if focus is set at 210 and the lens is then
zoomed to 70mm, without refocusing.
Testing it I find a small but magnificent focus correction if I auto
focus both before and after a zooming operation. It's kind of annoying
that it's not as able to hold true focus through a zoom as the Sigma
Zoom 70-210mm f4.0~5.6 UC-II.
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