Pentaxian Moderator Emeritus Join Date: May 2007 Location: Edmonton Alberta, Canada |
Why use auto focus with an ultra wide lens? Just set the camera on MF and have a look at your distances. Then focus the lens to that approx distance. Even wide open an ultra wide lens has so much DOF that everything is in focus anyway. Boost the ISO, add +0.3 Ev and stop the lens down a couple of notches. Everything will be as sharp as the shutter speed allows.
That being said, I use a DA*16-50mm for receptions a lot and it doesn't have much trouble finding focus in any light. I've also used the DA 12 -24mm the same way and it's not been a problem. There's a trick to it IMO. Put the camera on spot focus and find as much contrast as you can, like a white shirt at the waist of dark pants. Or dark hair against light skin. That helps the lens focus. Also put the camera in AF.C and just keep tracking your subjects. You'll have lots of keepers. Pentax lenses are the best for this though with the quick shift as you can MF the lens in a second.
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