I'm just killing time today and have been pondering the Alpa website and product brochures. I'm wondering about the SWC and STC cameras and how to best buy into the system, in particularly how best to plan lens purchases. I've been thinking about getting a SWC for a while with a 6x7 film back, but would want to make use of the shift movements. Does this mean I'd have to get the XL lenses (80mm f4.5 XL and 58mm f5.6 XL are the only two I'd want / need) because of their larger image circles? Why are the XL lenses not listed in the brochure as suitable for digital use? Are then not high enough resolution, or what?