The angle of view indicates the area that will be included within the film frame when the lens is focused to infinity. The standard practice is to give the angle of view based on the diagonal of the film format. Since most subjects are either horizontal or vertical, angles of view for these are given in the lens data sheets. (AMPHOTO, Dr. Joseph D. Cooper, Honeywell Pentax Manual, Chapter 3, page 2.) The lens data sheets referenced in the same chapter give, for example:
SMC Takumar 24mm f/3.5 . . . Angles of view Diagonal 84 degrees Horizontal 74 degrees Vertical 53 degrees . . . The Spotmatic II manual lists this lens simply as having an 84 degree angle of view. The useful angle of view depends on your application, I suppose. ppro > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Shel Belinkoff > Sent: Monday, October 22, 2001 5:22 PM > To: Pentax List > Subject: OT: Angle of View > > > > When it is said that a lens has a certain angle of view, where is point > from which the angle is measured - film plane, somewhere inside the > lens, front element? > -- > Shel Belinkoff > mailto:[EMAIL PROTECTED] > - > 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 .
