"MangroveRoot" wrote

As it happens, the extension tubes I have include linkages
that connect the aperture detector (?) on/in the body
to the aperture adjustment on the lens.
It is in that sense that I said that they are a different case.

(Extension tubes on a large format camera ... that is a first.)

Yes, extension tubes that carry through the linkages often
don't need any intervention to compensate for extension and
can be used with wide-open metering.
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.darkroomautomation.com/index2.htm
n o lindan at ix dot netcom dot com