On Oct 17, 2007, at 9:49 AM, Cotty wrote: > On 17/10/07, [EMAIL PROTECTED], discombobulated, unleashed: > >> And less than 2.8 is frequently the stop of choice for portraiture. > > or even 1.4 ;-)))
Huh? I dunno about anyone else, but I need about 1-1.5 feet DoF as a minimum at 7' focus distance for a conventional H&S portrait to obtain razor sharp eyes and acceptably sharp nose to shoulders, with a nicely soft backdrop. With an 75mm lens on a 35mm film SLR, that requires f/8. - Subject distance 7 ft Depth of field Near limit 6.43 ft Far limit 7.67 ft Total 1.24 ft In front of subject 0.57 ft (46%) Behind subject 0.67 ft (54%) - With a 43mm lens on a Pentax DSLR, it presents a somewhat wider FoV, but f/4 works well to produce a very similar image: - Subject distance 7 ft Depth of field Near limit 6.42 ft Far limit 7.7 ft Total 1.28 ft In front of subject 0.58 ft (45%) Behind subject 0.7 ft (55%) - Shooting with either at f/2.8 or larger lens openings creates unsharpness in the foreground (at the nose) of a H&S portrait, which is distracting and looks bad. Godfrey -- 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.
