Originally posted by rawr
AF test results are highly dependent on the subject, the camera AF settings, the lens, and the light. I've done some challenging sports shooting [night-time rodeo] with almost the same rig as the PentaxForums test - a D610 and a Nikon 70-200 f2.8 - and the keeper rate was certainly much less than 96%.
Thats been my experience as well. I'll take 400 rehearsal pics of actors and have over 95 percent be sharp. the main reason for not using pics is eyes closed, head turned the wrong way, etc. Love the K3 and K5 for that matter (except lo light on the K5)
My first buy was a K10 and a Tamron 18-250 and i had this naive view that SR was going to make all my pictures sharp. Then i slapped the combo on a tripod and realized that i was the resp. party for all of my fuzzy pics.
Use a shutter speed thats 2 to 5 times the FL and your pics will be nice and sharp. For a 250 FL, that would require a min. of 1/500s at 2XFL.
SR also needs a little bit to time to settle, so if one is snap-shooting pics - just turn off the dang SR and rely on shutter speed thumb rule.
If one is shooting humans, dogs or any moving subject. SR does not help the moving subject at all. 1/100 to 1/250 will help those people pics to be sharp.