So i've got myself interested in this macro project and now I can't stop thinking about it till i figure it out. For simplicity sake, the objects i'm photographing are 3D and are about half the size of a 4x5 frame. Filling the whole frame would be 2:1. My goal is to get a 4:1 ratio while maintaining a lot of DOF and have some working distance between the lens and the object. I know enlarger lenses of short focal length will be able to achieve a more magnified ratio, but wont it also give you an extremely narrow depth of field? My "view camera technique" book says that "perspective is often less attractive with 3d subjects when the camera to subject distance is small". Does that mean that the longer focal length you use will make a better image? If I combine two cambo cameras with 21" rails, adding a second tripod, i would be able to get more than 1000mm of extension. What would be the best size lens to use with that much extension. Fuji makes a nice 180mm F9 that might seem to fit. I know a 1:1 ratio requires twice the focal length of the lens, but do you just add 180mm for each increase in size? Would 900mm of extension give you a 4:1 magnification?