On Wed, Mar 09, 2011 at 03:01:36PM -0500, Bruce Walker wrote: > On 11-03-09 12:39 PM, mike wilson wrote: > > > >I have used slit Fuji film canisters for flash diffusers. > > Yes! I keep one of those handcrafted gadgets in my kit bag. But I > use it exclusively to get more "reach" when I'm triggering remote > Pentax flashes optically. The film canister increases the spherical > angle (I'm sure there's a more accurate phrase for that)
Not really - the commonly-used technical term is "solid angle" A pinhole spotlight has a solid angle that's very nearly zero; an omni-directional light covers a solid angle of 4*pi steradians. -- 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.
