Allright - mixed opinions here.

The reason to why I was asking is simply because I wanted to know if I had the opportunity to do 6x6 without cropping etc. I do have other 6x6 cameras - folders and TLR but I really love the work I am able to produce with the RB - and the project I am doing at jeg moment involves both 6x6 and 6x7 and given the fact that the RB67 has removal backs it would be really awesome to shoot the series on the same camera.

About vignettes.. Improper lens hood could be an interesting thing to do - ill look into that I think.