The lighting may have changed slightly between the time you pressed the button and the time you use the DOF for a reading. Another possibility is that your lenses aperture blades are slow. This will give you a shutter speed higher than expected as the lens will not be entirely stopped down when the reading is made.
J and K Messervy wrote: >On my DL, pressing the AE-L button causes the lens to stop down for a very >brief moment. If I then use the DOF preview to check the exposure, it has >not been set to 0.0. >----- Original Message ----- >From: "John Francis" <[EMAIL PROTECTED]> >To: "Pentax-Discuss Mail List" <[email protected]> >Sent: Friday, September 15, 2006 3:47 AM >Subject: Re: K10D and Lenses with Aperture Ring > > > > >>On Thu, Sep 14, 2006 at 09:27:00PM +1000, J and K Messervy wrote: >> >> >>>The istDL doesn't have a green button, so I've found that I have to use >>>the >>>DOF preview lever to stop down the lens to get the right exposure >>>settings >>>in M mode. It works but is not quick or convenient. >>> >>>James >>> >>> >>I don't believe that's correct. Operating the DOF preview stops >>down the lens and turns on the metering circuitry, thus allowing >>you to check your exposure, but doesn't change any settings. >> >>Pushing the AE-L button (if you are in manual mode, of course) >>will stop down the lens, meter, and then set the shutter speed >>automatically to what the camera calculates for correct exposure. >>Once you release the AE-L button the lens opens up again, and >>the shutter speed stays at the last calculated value until you >>change it (either manually or by pushing the AE-L button again). >> >>Just get in the habit of a quick press of the AE-L button before >>tripping the shutter and you'll hardly notice the difference. >> >> >>-- >>PDML Pentax-Discuss Mail List >>[email protected] >>http://pdml.net/mailman/listinfo/pdml_pdml.net >> >> >> >> > > > > -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
