Good to know. Paul via phone
> On Mar 13, 2016, at 11:27 PM, steve harley <[email protected]> wrote: > >> On 2016-03-13 14:56 , Paul Stenquist wrote: >> Stopping down sharpens those edges and makes them visible. Same as when >> looking for dust specks. > > i read a few references and it seems clear that optical vignetting can be > reduced or eliminated by stopping down; the second illustration on this page > shows why: > > <http://toothwalker.org/optics/vignetting.html> > > > > -- > 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.
