What is "allowed" by the mfgr. and what is acceptable to the photographer is two different things of course. 1/3 stop may be fine for color neg film but it might not be for DSLR if you dont want to have to tweek all your images to get them to match on density when changing the fstop/shutter speed combination under same lighting conditions. He specifically stated there was visible ( not just measurable ) differences didnt he? jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of William Robb Sent: Wednesday, January 24, 2007 10:05 PM To: Pentax-Discuss Mail List Subject: Re: A test of meter/exposure calibration between *ist DS and K10D ----- Original Message ----- From: "J. C. O'Connell" Subject: RE: A test of meter/exposure calibration between *ist DS and K10D > When you use any lens on "A" setting, and set > aperture with the body, there shouldnt > be any variation with fstop related to metering sensitivity range as > you chose smaller fstops, i.e. metering is done wide open regardless > of selected f stop for the exposure. If you are > getting exposure variation vs fstop with the lens on "A" > then you are not getting accurate fstops with > that lens when controlled by body or the corresponding > shutter speed for the smaller stops is inaccurate or > BOTH combined is giving you noticable variation. The histograms in "A" are showing less than 1/3 stop exposure variance. That is well within the allowed parameter for mechanical accuracy. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
