I kept my Pentax FA 50 f/1.4 for its use on fast aperture in indoor on my boys who move a lot. My manual focus skill can't catch up with my boys. These are instantaneous snapshot samples without flash and tripod. It happens when my boy falls into the mood of dancing and singing before bed time. I used
AF.C with track focus and
wide open in f/1.4 with K20D on jpg, no post processing. These are by no means great samples from FA 50, but the
AF lens with fast speed has its place and I find it crucial to deal with less noise and motion blur.
1/80 sec, f/1.4, 50mm, iso 800 1/100 sec, f/1.4, 50mm, iso 800 1/80 sec, f/1.4, 50mm, iso 800
My DA 35mm f/2.8 can't do it easily without flash unless I up the ISO to 1600 or more and I challenges myself with the manual focus 50's, I would have missed the shots.