Originally Posted by Archimedes the Dog
Since the PE lenses have half stop apertures, does the AEII prism work with them? Does it get the right info from the lenses?
Yes and no.
PE lenses will "work" [meter] on the ETRS with the AE-II prism but at full-stop detents only.
The AE-III prism is required to meter 1/2-stop aperture settings with PE lenses.