At the end of January i went to see a Bresson Exhibition, it was all portraits. The images on display were quite large, alot of them were around 20x24 or maybe larger . The prints were awesome, i was really surprised what could be done with a little 35mm neg.
Also the lenses Bresson were using, whilst being Leica, probaly were not even near the standard of most lenses today. Paul ----- Original Message ----- From: "Shel Belinkoff" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, February 12, 2002 10:56 AM Subject: Re: Salgado: Equipment & Technique Makes an Impact > What changes is the area of acceptable sharpness. DOF is based on a > factor called the "circle of confusion", and as long as that circle is > small enough, the eye sees the image as acceptably sharp. The > "acceptable" size of this circle for 35mm work is 0.025mm, but this > number only works for prints up to a certain size. As you may imagine, > as the print is made larger, the circle of confusion also grows in size, > and what looks sharp in a 5x7 or even an 8x10 print, can look very much > out of focus when the print is enlarged to 20x24, or larger. the COF is > generally calculated for prints no larger than about an 8x enlargement. > > What you have to realize is that there is only one plane of exact focus > - so, for example, if you focus on someone's eyeball, that is the only > part of the image that's perfectly in focus. Stopping down the lens > gives greater DOF, based on the COF. So, as you can see, if I've > explained this well, the bigger the print the more important critical > focusing is, and greater DOF is needed to maintain an area of acceptable > sharpness. > > Timothy Sherburne wrote: > > > I'm not sure I understand how DOF "changes" based on your final print size. > > Could you elaborate? > > -- > Shel Belinkoff > mailto:[EMAIL PROTECTED] > http://home.earthlink.net/~belinkoff/ > - > This message is from the Pentax-Discuss Mail List. To unsubscribe, > go to http://www.pdml.net and follow the directions. Don't forget to > visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
