I have 150mm lens that doesn't have the coverage I want, but does have a good and accurate shutter on,obviously, the correct type of lensboard. Is it possible to remove the lens elements from the shutter and swap in different ones that will give me more coverage or are LF shutters specifically fitted to each lens? If it is possible how do I know what Copal my shutter is? Is it always found printed on the shutter? Thanks.