At 06:23 AM 28/11/2007, John Graves wrote: >But isn't true that the sharpest focus for a lens is less than wide >open
Generally yes. >, so by opening it up you are decreasing overall focus by some amount? You don't loose much sharpness opening up the 77, but DOF really becomes shallow. In the situation that generated my original message, opening up the lens wasn't an option in any case. I was shooting with a poor mans "studio" (off camera flash fired through an umbrella) To kill the light spill on the background (ie, make the background black) I had to shoot around f11-f16. Cheers, Dave "I lurv my 77mm f1.8 Ltd" Savage -- 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.
