michael: how do you calibrate it? any "standard" procedure?[/quote]
Nothing scientific here at all. Since my initial transparencies all came back too dark, I just ran a bracketing test -
Using the 508 to meter in incident mode, I shot several different scenes, outdoors and under studio strobe with +1/3, +2/3, and +1 exposures. Note - I had to "guess" as to where 1/3 and 2/3 was between any two f-stop markings, but it wasn't that difficult.
Anyway, I layed them on a light table, and chose the "best" exposure from each of the several groups. I picked the +2/3 stop exposure in most, if not all cases. Henceforth, I would set the 508 @ 32 or 64 respectively for 50 and 100 speed films.
Truth be told, there's not a whole lot of exposure difference between any two pairs, as 1/3 stop is not too critical. I did think that +1/3 might still be a tad too dark, and +1 a tad too light.
I've done this "test & calibration" with every camera/meter I've ever owned. Sometimes, after a while, I may even tweek the setting. Example - I've used a PME51 for over a decade, rating it @ -1 stop (using EI 200 for 100 speed film). Just recently, I've decided that those are a little too dark, and have now changed my "normal" EI rating to -2/3.
Michael
