No, it's not lines per millimeter, it's their SQF numbers. SQF is Pop Photo's "Subjective Quality Factor". It's a number based on MTF and converted to a system meant to show what you should expect in different size enlargements. It's like a grade in a class you take, where 90 + is an A, 80-89 is a B, etc. It's just meant to make it easier to see where the strengths and weaknesses are, and see how big an enlargement you can make before you lose grade A quality.
Thanks, Ed http://lightandsilver.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]] On Behalf Of T Rittenhouse > Sent: Sunday, February 17, 2002 8:03 PM > To: [EMAIL PROTECTED] > Subject: Re: Popular Photography 31/1.8 Limited test (WAS: > Re: Pentax a "best ever prime lens" at Pop?) > > > lpm <snip> > ----- Original Message ----- > From: Dan Scott <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, February 17, 2002 6:32 PM > Subject: RE: Popular Photography 31/1.8 Limited test (WAS: > Re: Pentax a "best ever prime lens" at Pop?) > > > > Ed, > > > > What does the number between the f/stop and the letter grade stand > > for? <snip> - 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 .
