Hi! I was wondering if the only possible way to set and maintain a specific aperture value when a lens (SEL50F18) is detached from Sony e-mount body is to detach the lens while camera is ON? I red somewhere that the last pin on the mount supply’s power to lens, so there cannot be issues (except dust) - is it so? P.S. Another question - can anyone share the experience with a Sony lens (probably SEL50F18) reversed + extension tubes for macro photography? Thanks!