Archived posting to the Leica Users Group, 1996/08/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> Godfrey DiGiorgi <ramarren@apple.com> wrote ... <snip> ... > It sounds to me that the M6 and Pentax are calibrated a stop down ... <snip> ... > "C.M. Fortunko" <fortunko@boulder.nist.gov> wrote ... > Subject: Re: PX625 Alkaline Battery Tests: Observations and Questions <snip> ... > I wrote the original message. I do not want people to draw conclusions like > that yet.... Hi Group - I fail to see the importance of Chris' exhaustive tests of all his camera equipment. As far as I can tell, my M6 is right on. Any errors in exposure have been mine and mine alone. I note, however, that for some EV-values, I can adjust the exposure within a 1/2 stop with no perceptible difference in two LED's intensities - so I don't understand the usefulness of this comparative testing with the M6-meter. I think that you're trying to use the M6 meter for something it was really NOT designed for. It's just an indicator display and an approximate one at that. > I don't understand the reasons for the differences. They may have been > affected by the focal lengths used and the internal construction of the > different meters. Maybe. But please remember. All these things you're testing are consumer products and to keep them affordable, they're designed to a different standard than scientific or military products. None of the cameras or light meters you're testing bear the label `Calibration traceable to NBS' or conforming to a particular `DIN Standard'. -- Wolfgang |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | Wolfgang Sachse Phone: +1/607/255-5065 | | Theoretical and Applied Mechanics E-mail: sachse@msc.cornell.edu | | Cornell University FAX: +1/607/255-9179 | | Ithaca, NY - 14853-1503 USA Department Secretary: 607/255-5062 | | WWW Home Page http://www.msc.cornell.edu/~sachse | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~