This is excellent advice. The 50/f2 is one of my beloved lenses for my X-Pro2 and street photography. As a pro also doing workshops, I see a lot of people struggle with these so-called portrait lenses like the 50/f1, the 56/f1.2 or in full-frame the fast 85mm lenses (f1.4 or 1.2). Esp. when you're in a hurry like the short time you have when shooting portraits in the street. Many like to open up the aperture as wide as possible ending up with all sorts of focusing issues due to the shallow DOF.
Dear members and visitors, I have the same problem with steveblue and after I read all of your posts I finally concluded. I just wrote a friendly table, so everyone can read and understand it, with real examples. I can't cover all combinations but those I have tried is enough to understand your needs for your case and to apply them for the best solution:
Apple Computers Memory Cards Compatibility
Card Reader (internal or external) new + OS new