Paul via phone
> On Sep 6, 2014, at 6:53 PM, steve harley <[email protected]> wrote: > > on 2014-09-06 16:36 Paul Stenquist wrote >> In the center of the blank square is a single red dot of abotut 3/16 inch >> diameter. This is the focal point. > > great technique, but why red? is it possible that red would affect the focus > due to different wavelengths of light refracting differently? (though lenses > attempt to correct for this It may be my imagination, but red on a neutral color seems to focus with more snap than other colors. > -- > 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.
