I would be interested in other folks' opinion about this problem: I am using an Omega 45D monorail, and would like to use a 90mm wide angle lens. I have a recessed lens board, but to my dismay, I find changing the normal bellows to a wide angle bag/baloon bellows impossible. It seems this model was not equipped to do so. As I do not yet have a 90mm lens, the simple answer to "Can I effectively use a 90mm lens with the recessed board on this camera without a bag bellows?" remains unanswered. Anyone have experience down this path?