Agree with Matt! Jack
--- On Mon, 6/6/11, Matthew Hunt <[email protected]> wrote: > From: Matthew Hunt <[email protected]> > Subject: Re: Focus!! > To: "Pentax-Discuss Mail List" <[email protected]> > Date: Monday, June 6, 2011, 6:05 AM > On Mon, Jun 6, 2011 at 8:40 AM, Eric > Weir <[email protected]> > wrote: > > > I remain frustrated at my inability to get > well-focused shots. Saturday I was out exploring > neighborhoods around the community in which I work and had > my camera along. I came across an adult pickup soccer game > on one of the school playing fields. I stopped and sat in > the shade with a group guys who were taking a break from the > game. Then I went out of the field and shot about a 100 > images. > > > > I was looking forward to seeing the result. It was > sunny mid-morning. The camera's a *ist DS. The lens was an M > 135/3.5. ISO was 200. Aperture was mostly around f11. About > half the images were shot at 1/250, half at 1/180. I kept > focus set at infinity. > > > > I thought surely, at that speed, with that focus, at > the distance at which I was shooting I'd get a few sharp > well-composed images. A handful -- less than five -- are > so-so, but not really sharp. The rest are all fuzzy. > > According to the Online Depth of Field Calculator(*), if > your lens is > set to infinity focus & f/11, the near edge of the > depth of field is > about 264 feet away. That's most of a football field; it > doesn't > surprise me that many of your photos are not sharp. If you > instead > focused the lens at the hyperfocal distance (the same 264 > feet for > f/11), the depth of field would extend from 132 feet to > infinity, so > that would be better, but still maybe not good enough, and > depending > on the focus scale markings, it might be hard to set the > lens to that > focus distance precisely, anyway. > > Also, for sports, 1/250 - 1/180 is a little slow. You might > be seeing > motion blur in the subjects, not just focus error. > > I'd probably go a little higher on the ISO, a little faster > on the > shutter speed, and consequently a larger (smaller number) > aperture. I > don't know much about soccer, but in many sports it helps > to pre-focus > on something (like a base, in baseball) and shoot when the > action is > there. Shooting sports with MF takes practice. > > (*) http://www.dofmaster.com/dofjs.html > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link > directly above and follow the directions. > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
