What lens? Can you focus at infinity? How much shift, tilt, swing, rise and fall do you get before vignetting sets in? How are you focusing? What DSLR body?
Nice shots. My guess on the camera is a D300s. I would like to know more details on how you pulled this off. I am unfamiliar with the 20 mm tube. Would you explain how this is attached and if it actually protrudes into the camera body. Thanks,