I have a question about the differences and relative values of these two cameras. Any assistance would be appreciated. On the one hand the cost of an excellent camera for both configurations is of interest to me. The film availability and luggability is another consideration. However, the relative cost to purchase and availability of both the 7x17 and 5x12 is what I'm primarily interested in now. Is there a copy of McBrooms out there? My understanding is that the 7x17 (sans lens) is approx. $1500 (give or take) and I don't know about the 5x12. Anyone know? Is one camera more rare than the other. Thank you for any information!