That's all very true of conventional portraiture. But I've seen many lovely shots with critical focus on the eyes only. Paul -------------- Original message ---------------------- From: Godfrey DiGiorgi <[EMAIL PROTECTED]> > > 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.
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