>aren't you assuming the very point that's at question here? In other >words, if your camera meter disagrees with the external meter, you're >assuming that the camera meter is accurate and that the aperture or >shutter are inaccurate. But the purpose of the exercise is to >determine the accuracy of your meter, so you've made a circular >argument and undermined everything else you wrote.
I don't know if it was my poor English (not my 1st language). This was not what I intended to say. I have never said (or did I?) the camera metering was accurate even if it was different from the incident readings. What I was trying to say is that "don't be surprised if the "chosen" shutter speed was different between 'A' and non-'A' setting on the lens. This is due to the mechanical aperture coupling tolerance difference (different lens/camera combinations have different results). It has nothing to do with the accuracy of the actual aperture or actual shutter speed, but the "chosen shutter speed" by the camera. And for the purpose of the test (to determine the accuracy of the metering, not the accuracy of the mechanical coupling), the lens is best to set to 'A'. This way, all communications are done electronically and there will be no chance for error (due to mechanical tolerance). The most important thing here is, we are not trying to determine the accuracy of the actual aperture of any lens (because every lens is different), or the accuracy of the mechanical aperture coupling (variable resistor), but the metering alone. regards, Alan Chan _________________________________________________________________ Join the world’s largest e-mail service with MSN Hotmail. http://www.hotmail.com - 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 .
