Welcome! I have a RB-67 with 90mm and 127mm "L" lenses, along with a large collection of Konica 35mm SLR gear. I've only shot a few rolls through the RB-67 but am looking forward to a lot more shooting once spring gets here! I did get the split image focus screen for mine, found that helps quite a bit. I also generally take my Canon EOS 20D along with me to take a test shot, check the histogram for proper exposure as a double check to my light meter readings before I fire off the Mamiya. At $2-$3 a pop for film, processing and scanning, it helps insure I have my exposure right the first time. Enjoy your Mamiya!