Cory Papenfuss <[EMAIL PROTECTED]> wrote: >>> The aperture indicator lever moves the same distances. The stop-down >>> coupler doesn't. >> >> That's it: With K/M lenses the movement of the lever is directly >> proportional to aperture diameter, with "A" and later lenses it's >> directly proportional to aperture *area*. >> > If that's true then it is quadratic, not logarithmic, no?
Since the area varies with the square of the radius that'd be a "yes" ;-) -- Mark Roberts Photography and writing www.robertstech.com
