I'm starting out in the Alpa corner of Dante's Inferno...I'm interested to know a little bit about experience with shimming the back adapter.
I've seen the video that Paul Slotboom did and I have a fair understanding of the process. What I don't understand is which bit of the image chain you are correcting? Are you correcting for the lens infinity focus, for imprecision in the camera body, for imprecision in the back adapter itself or for imprecision in the back? Or are you correcting for the whole chain - all of those things?
Depending on the answer to that question...is a shimmed adapter ideally specific then to a combination of camera, back and lens or is it specific to that back on whatever camera/lens combo you choose to use it on?
Sorry if the answers to these questions are obvious...for some reason they aren't obvious to me.