as far s lenses goes. my rule of thumb is:normal,in this case around 80mm,half f that or thereabouts for WA(55would qualify)and double the normal(150mm is a good choice forMFportraits). that leaves you with getting a 55,80,150 combo eventually;there is hardly a way around it.see if you can get this as a kit,which will be cheaper than buying piece by piece. my only hesitation with the 645 is the format.it's a mini MF with little room to crop.6x6 or better yet 6x9would give you more negative to work with.hat said, Mamiya lenses have an excellent reputation.enjoy .