P.S. I should mention that in keeping with Pentax’s tradition of backwards-compatibility, they offer in-camera stabilization! You can take a 100 year old lens, (if there is one that old), and use it with your 2015 Pentax K-S2, and you get 3-4 effective stops of stabilization. The big advantage to “in-camera stabilization” is that the lens can be made smaller, lighter, and cheaper. The only dis-advantage that I can think of, is when you’re using long telephoto lenses, such as the 80-320, or the Sigma 120-400. When shooting at such long focal lengths, it becomes nearly impossible to hold it still, and since the stabilization is sensor-shift, it only kicks in when you actually “take” the picture. The Canon IS lenses stabilize the image because it’s actually stabilizing by moving the lens elements, therefore, when you look through the viewfinder, the image is already stabilized. With sensor-shift stabilization, you get the same amount of stabilization, but it doesn’t apply until the picture is taken. I never realized how hard it was to hand hold a 300mm lens until I used one without IS / OS / VR.
