Your mentioning large format shutters/apertures. Those are not the same as 35mm shutters. For example, on a large format shutter you could easily SCRIBE a new aperture scale at the correct points, the 35mm SLR lenses arent built that way. They cant be rescribed because the meter requires a specific angular travel per stop. JCO
> -----Original Message----- > From: T Rittenhouse [mailto:[EMAIL PROTECTED] > Sent: Wednesday, June 11, 2003 5:50 PM > To: [EMAIL PROTECTED] > Subject: Re: Exposure > > > You have to do the calibrating. > > For instance my old Graphex shutter on the Press Camera is consistent to > within 1/6 stop (checking 10-12 times for each speed) but is > quite a bit off > the marked speeds, a modern electrically timed shutter should be much more > consistant. My incident meter reads to 1/10 stop and is consistent +- one > mark. If your film needs are critical you buy large quantities of the same > emulsion number, and store it in the freezer after testing a few > rolls. You > also have to do your own developing to achive consistant processing. All > that being said, I never worked to those levels of accuracy. 1/2 stop is > fine for my critical needs, and 1 stop for general photography. > > So, in a way you are correct, you can not achive that kind of accuracy off > the shelf, but it can be done. > > Ciao, > Graywolf > http://pages.prodigy.net/graywolfphoto > > > ----- Original Message ----- > From: "J. C. O'Connell" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Wednesday, June 11, 2003 4:45 PM > Subject: RE: Exposure > > > > I dont believe that any 35mm SLR shutters and apertures > > are calibratable to that degree of accuracy at ALL > > settings. Secondly there are additional errors of > > consistancy even if you could calibrate a given > > setting's AVERAGE value to perfection. > > >
