Originally posted by RBellavance Sigma's incompatibilities often stem from the fact that they reverse-engineer the protocols instead of paying license fees to the manufacturers.
I've wondered whether these license fees are the reason that Tamron has opted out of some future lenses, and Sigma is still in the game. One of the reasons i first got into pentax vice Olympus, was the availability of 3rd party lenses.
I assume that the Sigma screw drive lenses like 10-20 will work ok with K5 in LV? Is that correct?