I'm mainly a still life photographer - macro photography, landscapes, artifacts etc. But lately I've decided to shoot children and their parents in dynamic environments like the beach or other places. fun places. I started using my Pentax 100mm FA f2.8 macro for this job, but the limited focal length and screw-drive autofocus didn't work for me when shooting fast-moving subjects. I also like to shoot wide open to blur the background. About 10-15% of my shots came out soft with 100mm and my K-7,