Hi all. I'm curious to know which Hasselblad extension tubes have what focus range. I'm interested in doing semi-closeup portraits, from about 1.5-2 feet away with the 80mm, so that the face and a small amount of the shoulders will take up the frame. If anyone has an easy to read table that will give me approximate focusing range and exposure compensation for each of the tubes, that would be spectacular. Also, what's the difference between the regular and "E" type tubes? I appreciate the help, I'm new to the Swede. Thanks!