I have a Pentax 6x4.5 autofocus, and have had it for a number of years. When I first bought it I was shooting images for money. It was easy to carry, fast to focus and quality of images were tack sharp. The 6x4.5 will allow for a horizontal or vertical shot. Cropping was not a problem, as most clients knew what they were looking for. I had it serviced by Pentax USA, when they were still performing that service.