I said:
>BR-6 lets you close the diaphragm to do stop-down metering as well
as to expose with AR-4/7/10. With >BR-3, you have to meter and expose with
the lens wide opened. Using your finger to close the >diaphragm is probably
too difficult with the BR-3 mounted.
I haven't gotten the post back yet but may be someone have already
corrected me. BR-3 lets you meter and expose at the f/stop you select just
like when the BR-3 is not mounted. So BR-6 just give you the convenience of
maintaining the lens wide open while you compose.
/Isaac
