I love the SMC-A 150mm f/3.5 on my Pentax 645N. It is a great portrait lens! A few months ago I bought a Mamiya 7 with 65mm and 80mm lenses on the spur of the moment for $1200 on eBay... I regretted it until the camera arrived and I saw the awesome image quality. Now, I think I got a pretty fair deal!