>I've read in another post from
>you that the BR-2 is for ManualFocus and the BR-2A is for
>AutoFocus. I've never seen a BR-2, nor for sail nor in
>catalogues. What is the difference?
I should have said that BR-2 is for MF mount only and BR-2A is for AF or MF
mounts since you are not going to get AF with the lens reversed. The BR-2A
is a slight modification of the BR-2 so that it would not demage the AF
contacts on the AF cameras. There are other accessories with this
modification: PK-11A and BF-1A. My question has to do with BR-4A. It was
mentioned in the previous US full-line brochure. The description seems
strange. I don't know if it is a typo or it really exists.
>Could somebody please explain me the difference between
>exposure metering with BR-6 and with BR-3 mounted at the back of a
>reversed lens?
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.
BTW. I have found out the differences between BR-4 and BR-6. The BR-4 has
lens mounts on both sides. The BR-6 has a lens mount on one side and a 52mm
thread on the other side so it is like a BR-3 but with the auto-diaphragm
mechanism. This means that if you put a BR-6 togehter with a BR-2A, you
have a BR-4 equivalent, and if you put a BR-4 together with a BR-3, you have
a BR-6 equivalent.
Now if only someone can tell me the difference between BR-4 and BR-4A, if
BR-4A exists, I would be happy.
/Isaac
