That's built in EI compensation; 0 is none, 1 is .3, and
Originally Posted by Nick Zentena
2 is .6, or 1 or 2 1/3 stops. Use or not as you choose.
At 0 the ISO set is the EI used by the meter to arrive
at an exposure recommendation. At 1 or 2 that EI is
reduced by 1 or 2 1/3 stops.
I found my AEIII meter to give high readings even
after making a reduction from the ISO when setting
the film speed so I added .6 or 2/3 more
with that switch.
I'm quite sure that info is correct. I started using
the rotary a couple of years ago. I'm basically a WLF
type and that eye level was a pain in the neck,
literally. I encounter a lot of verticals when
working in the woods. Dan