Originally posted by gofour3 This is normal with all 6x7, 67 and 67II bodies.The TTL and AE metered prism will not work with the lens DOF lever in "AUTO".
Hi Phil, thanks for the link.
Sorry I've confused things a bit. I'm not getting any metering with the tubes on either camera whether the switch is set to Man or Auto. The 6x7MLU only meters in stop-down mode without the tubes (needle sits at the top and moves down for metering - seems strange), in AUTO it stays at the top. The 67 meters fine in both modes without the tubes, but nothing with the tubes.
I can't see any logical reason why the tubes would prevent metering, the black annodising appears clean and undamaged on all faces, they appear to click into place correctly and there seems little else to go wrong?
John.