Originally posted by Fl_Gulfer Are these the Auto metering set of Extension Tubes? Vivitar AT-22
They are "auto" in the sense that they have the aperture levers. With an appropriate lens, you can meter with open aperture. The camera body will close the aperture of the lens during picture taking.
I wrote "with an appropriate lens" because the lens has to have an aperture ring, and OFF the A setting (if exists). The metering will be the same as for an M lens (camera in M mode, use green or AE-lock button for close-down metering, no p-TTL flash, ....).
As mentioned, a PK-A teleconverter with optics removed makes the best extension tubes. You don't have autofocus, but it supports all metering modes, including p-TTL flash.
An example
here.