> On Apr 17, 2015, at 9:35 AM, Mark Roberts <[email protected]> wrote: > > Eric Weir <[email protected]> wrote: > >> A question: If, as Peter says, diffraction begins to take its toll at >> f8-f11, of what use are smaller apertures? > > 1 - Sacrificing maximum resolution at the plane of focus can be a > worthwhile tradeoff for getting greater depth of field: You lose a > little sharpness in the center of the DOF but gain it everywhere else. > (Though above f/22 the losses pretty much overwhelm the benefits > everywhere.) > > 2 - Smaller apertures allow longer shutter speeds, which may be more > desireable in some circumstances.
Thanks, Mark. To make sure I understand. With smaller apertures focus will be sharper at the front and rear of the DOF? Is that the diffraction effect? ------------------------------------------------------------------------------------------ Eric Weir Decatur, GA USA [email protected] "Our world is a human world." - Hilary Putnam -- 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.
