Before I was fully immersed in digital, I used a Horseman VHR view camera. My most used lens was a 105 which was about a 40 mm lens in full frame. Based on that I would love to have the 45 PCe to use for landscapes. Simon I'm curious why you want a 17mm PCE lens? Yeah it would be nice to frame a flower in the foreground, and the mountains in the back, but 17 is extreme.