Hi, every f-stop has a hyperfocal distance. The reason why one of them, generally f/8, is marked differently from say f/11 or f/16, both of which will of course give you greater depth-of-field and are therefore better from the hyperfocal point-of-view, is that f/8 is the optimal aperture from the optical quality pov. So it was quick and easy to get the optimal combination of aperture and depth-of-field for hyperfocal distance. It is also why the phrase 'f/8 and be there' specifies f/8 rather than f/64 or whatever. If it was just about getting as much in focus as possible they'd all do it with the smallest aperture.
--- Bob mailto:[EMAIL PROTECTED] Monday, March 04, 2002, 5:15:34 PM, you wrote: > Are you sure about that? On my SMCP-M SMCP-(K) and SMCT lenses > the only different colored f setting is the hyper focal stop with > the same color, (orange), marking the hyper focal distance. This is > only on the Wide Angle lenses;. > At 06:51 AM 3/4/2002 +0000, you wrote: >>Hi, >> >>I've always thought of this as a classic example of pointless >>automation. On the older series of prime lenses the optimal aperture >>was marked in a different colour from the others. In conjunction with >>the depth-of-field scale on the lens this did everything that the MTF >>programme does, and all it requires is paint and a fine brush. A nice simple >>solution. >> >>--- >> >> Bob >> >>mailto:[EMAIL PROTECTED] >> >>Monday, March 04, 2002, 1:49:07 AM, you wrote: >> >> > Yes. The PZ-1p has an MTF mode that reads the chip info in an >> > FA (and maybe an F) lens and uses the best aperture. It has >> > another setting that will select the best DOF, too. Not to >> > mention a third setting that will choose the highest possible >> > shutter speed. >> >> > Len >> > --- >> >> > ----- Original Message ----- >> > From: "Shel Belinkoff" <[EMAIL PROTECTED]> >> >> >> Hey gang ... it's my understanding that some new camera-lens >> >> combinations, when used in certain modes, will try to set the >> > lens at >> >> its optimal f-stop for sharpness and quality. Is this >> > correct? So, if >> >> the lens is best @ f8.0 and the camera has a choice of using >> > several >> >> shutter speed/f-stop combinations, it will choose the one that >> > will give >> >> f8.0. >> >> -- >> >> Shel 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 . - 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 .
