On Wed, Nov 01, 2006 at 08:44:57AM -0000, John Forbes wrote: > On Wed, 01 Nov 2006 04:02:45 -0000, J. C. O'Connell <[EMAIL PROTECTED]> > wrote: > > > My guess would be the sensor "base" speed is the speed > > At which no extra light ( slower sensor speed ) will improve > > The image quality any signifigant amount. No sense in > > Going slower if it doesn't improve anything. > > If you are shooting with studio flash, and can't turn it down low enough > to give you short DOF, then there is a very good reason to have lower ISO, > whether or not it improves the quality. > > Same goes for bright daylight. It's purely a theoretical concept in the > UK, but in other countries one wishes one could reduce the light > intensity at times.
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. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
