This whole thing seems to hinge on using the term aperture and "F" interchangeably. I don't believe they are. "F" is commonly used to denote relative aperture. And some folks seem to be using aperture to refer to absolute aperture. What a huge urination contest over some sloppy language....
Not to pick on Kent but, incidentally, in regards to his comment: >>>First off what you say could be done however making the diaphragm change with focal length is the hard way to do it. In fact I don't know of a single lens designer who could make that work very well because most zooms don't have much in the way of zoom/aperture direct interaction. <<< My FA 28-70/4 does exactly that and it does it very, very well. Great little lens. Since the lens mechanically varies the absolute aperture in proportion to focal length setting, relative aperture "F" is maintained - even when it is used on my K1000, ME, or MZ5. On my other zooms, the mechanical "F" scale/setting only indicates the correct relative aperture at the widest setting. Chris Lillja School Publications Guy - 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 .
