Hi- longtime listener, first-time caller as they say on the talk radio. Question: Is switching out a Canham 6X17 rollfilm back a simple task on a Linhof 5X7. I have an older Technika, and have been wanting a Canham unit for quite a while. Are the modifications such that it would be worth a second, dedicated back? I am watching one that is currently reasonable on the auction site, but if the switch from sheetfilm to canham is not a major field-task, I wouldn't bother with the second back. Insight is appreciated.