So I couldnt resist the deal on the Sigma 50-500 and it arrived today.
I'm planning to use it mainly for school sports, but of course I had to try it on the Q to see what it could do.
It actually performed better than I expected on the Q, from what I recall from using the 170-500 on my K-5 this lens is sharper.
These are some shots from today's backyard test, I will try to take it out soon for some field testing.
The target with Prime 01
At 500mm straight from camera, set at '1' aperture for f8(?)
With a little PP
At 300 straight from camera
DA*300 for comparison
Wide open the Bigma shows some purple fringe on the Q, which is a bummer because you can see the obvious effects of diffraction once you close it down a bit to eliminate the fringe.
Nothing I've tried yet beats the DA*300, but the Bigma is definitely usable and it is nice to be able to go from EQ 275mm to 2750mm without having to change lenses.