On Sun, Sep 19, 2010 at 05:11:54PM +0100, Bob W wrote: > > > > > But doesn't ISO 100 on a digital cam pretty much get you the same "look" > > as 50 in film terms? > > > > Does 100 become more like 25 when the top of the scale is really high? > > > > I can't handhold my camera at anything under 400 unless it is a really > > bright day. But it seems to me that 400 ISO > > on my drk side Camera is as sharp and fine as PKR64 in good light. > > > > But maybe its just my eyes... > > > > ann > > it's not just about 'look' in the sense of fine grain/reduced noise, but > about being able to make use of wider apertures in bright light. Especially > with sensors smaller than 35mm, when the depth-of-field is so pronounced. On > a sunny-16 day you'd struggle to shoot less than f/4 or f/5.6 at ISO 200. > > Bob
And that's assuming you have free choice of shutter speed. If you're shooting action you often are very constrained as to which shutter speeds you can use; shoot race cars (or cyclists) at too fast a shutter speed and you lose all of the sense of motion. I used to do almost all my race photography at ISO 100 (Provia 100F, in the film days); ISO 200 was faster than I really wanted. -- 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.
