I have more than a dozen SLR's, but I've always kept a RF for a pocket camera. I currently have a Kodak Retina IIIc and a Zeiss Ikon Contessa LK. Reading posts on here I've gotten an urge for a RF with interchangable lenses. I've ordered a FED5c with Industar 61 LD, caint wait for it to arrive. Anything I shud immediately check out on it b4 using?