----- Original Message ----- From: "Anthony Farr" <[EMAIL PROTECTED]>
> ----- Original Message ----- > From: "Shel Belinkoff" <[EMAIL PROTECTED]> > > > > 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 > > > > Rear nodal point. > > Regards, > Anthony Farr > A minor correction is in order. The rear nodal point is the point from which the AOV is measured to the film. The AOV to the subject (ie. in front of the lens) is measured from the front nodal point. The space between the rear and the front nodal points can be thought of as the province of the lens designer. As John Francis says, 180 degree and greater fisheye lenses appear to follow a different set of rules. Regards, Anthony Farr - 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 .
