On Wed, Nov 01, 2006 at 10:32:35AM -0800, Godfrey DiGiorgi wrote: > > On Nov 1, 2006, at 9:10 AM, John Francis wrote: > > > Indeed. Shooting in full California sunlight with the *ist-D can > > be a > > problem if I want to use a shutter speed below 1/100 for motion blur > > (heck, there were several occasions when I found Provia 100F too > > fast). > > It's also a problem if I want to shoot at f2.8 or wider to control > > DOF. > > I welcome the appearance of ISO 100 on the K10D, and would like to see > > ISO 50 once sensor technology makes that practical. > > ISO 100 seems slow enough for most uses. If I want motion blur and > wide aperture in daylight, I usually need something like ISO 1.6 to > ISO 3. ISO 50 doesn't net much for me in those circumstances.
ISO 50 is useful if you want to use wide apertures in sunlight for DOF purposes. Motion blur is a separate issue. Even with ISO 50 I can only get to f/2.0 in sunlight. Fortunately the only lenses I have that are faster than that take small (cheap) filters, so using an ND filter is practical, albeit inconvenient. I've run into the 1/4000 shutter speed limitation a few times when trying to use my 80-200/f2.8 zoom wide open. In fact there were a few times when the higher shutter speed of the PZ-1p wasn't quite fast enough, even shooting Provia 100F; California midday sunshine blows out the highlights if you expose using the Sunny 16 guidelines. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
