If they think that they can sell enough, then it is worth it. For Pentax ("I haven't
bought anything new in 20 years!") why bother. Right now IS and HSM are in the realm
of rumor for Pentax: a patent is not a product announcement. Minolta announced 3
lenses quite some time ago with their version of HSM, and they aren't out yet. When/if
they are actually put them on sale then Sigma will probably offer these features in
Minolta mount. The fact that Minolta hasn't started selling them yet should tell you
something about Minolta's priorities.
From: "Rob Brigham"
They need to wait for the Pentax to be released before they can
backwards engineer it. Do I read this right that this means Sigma now
have IS for their own bodies too? It must have been some work to
backwards engineer both Nikon and Canon systems...
