2010/5/17 Bob Sullivan <rf.sulli...@gmail.com>: > > You'll have to explain more about your equipment...
eBay listing 120569383280 is a Zörk ST-Dehner set like I have except my manual says f/45, 67 and 90 as opposed to 40/60/80 as stated there. It is basically a screw-in hood for a 40.5 mm filter thread precision machined to hold one of three pinhole disks. Diffraction effects aren't quite the same as those of a fully stopped down lens (or past f/16 anyway) cheers ecke -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
