Hi, just wondering if anyone has used the Hasselblad adaptor? I recently purchased one used, and it does not have a manual. On inspection, the unit is very well built, and there is even the little circular crank shaft type thing on the mount. How does this work? Do I just stop down the lens after focusing and then take a photo? What is the deal with metering? Also, do all blad lenses work? CF, F, FE, etc, etc. Thanks for your comments.