Originally posted by roseblood11 And you should mention that Pentax cameras are the only ones that don't have a stabilized viewfinder.
Actually, Pentax does have a stabilized viewfinder, when you use a stabilized lens. For incomprehensible reasons, Pentax does not make such lenses, but Sigma does.
Yes: optically stabilized lenses with K bayonet exist and work pretty fine on every Pentax DSLR since the K10D.
One pretty famous example for such a lens is the "Bigma", the 50-500/4.5-6.3 APO DG OS HSM. Another rather inexpensive example is the 70-300/4.0-5.6 DG OS, which can still be bought as new in some markets.
Of course: Neither the lens nor the camera body is aware of the other's stabilization, you should turn one of each off to circumvent problems. But with a long telephoto lens you might prefer OS, and using these Sigma lenses
you can do what no user of any other camera brand can do: You can choose. Nearly instantaneously, for each shot differently, if needed.