Speaking of these backs...
So when i was in college i did an internship at Scitex in Bedford, MA. I had no real interest in photography at that time.
I was working on printers for some time, but then got transferred to 'the Leaf room'. I had no idea what all these calibration charts where, bad pixel masking calibration software etc... i never used any of it and i just followed the instructions at that time. I knew the backs i was handling were worth big bucks, my boss reminded me of that all the time. But i was just college student collecting a paycheck.
Man, i really wish i paid more attention while working there. It could have been really insightful and maybe even lead to more complete understanding of things now.