From: Igor Roshchin
It's kind of funny:
This description of Sigma 70-200/2.8 (for Pentax!) says that the lens is
"Optimized for Pentax Full-Frame DSLRs":
http://www.bhphotovideo.com/c/product/833526-REG/Sigma__70_200mm_f_2_8_EX_DG.html/
Also, I wonder, if there is indeed and optical stabilizer in the Pentax
version. I suspect B&H just copypasted the description from that for
other cameras (CaNikon).
Well, and the description tells that
"Note: This lens is optimized for full-frame Nikon DSLRs and may also be
used with smaller APS-c size sensors but it will increase focal length
to about 100-300mm with most cameras."
If it is optimized for Nikons, it won't perform well on Pentax. Right?
Igor
http://www.sigmaphoto.com/shop/apo-70-200mm-f28-ex-dg-os-hsm-sigma
*When using the OS function of a lens with a camera which incorporates a
stabilizer unit, please turn the camera’s stabilizer unit off.
*For Pentax and Sony mounts, it is not possible to use the AF and the
built-in OS function of this lens when attaching it to film SLR cameras
as well as Pentax *ist series and K100D.
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