Greetings to all MF photographers - I purchased my 645 in Aug, 2001 with plans to offer clients the quality of Zeiss for their wedding portraits. In addition to their 35mm proofs. However, my attempts at using my 645 failed miserably and I turned back to 35mm. I started with simple tests: beach portraits, some family shots at home, some children bday parties; but everything was either over or under exposed. I was also embarrased that some of my shots were out of focus. I've shot 35mm for about five years as a wedding photographer and was hoping that the transition to MF would be easier. Can anyone offer advice on how to test out my 645 and measure my results?