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Very good article. There is also life for the older lenses with adapters (B&H carries many) for the digital cameras. I have had good success with the 50mm f1.4 FD (the old standard) .  Mount  a reversing adapter (Mine is still a FD series) on the front of the lens, match your filter size here, to the lens . (The adapter threads on like a filter and allows the lens to be mounted with the front end towards the camera!) This  setup allows the field curvature to flatten out so the entire frame is closer to the same focal plane..useful for a quick duplication of older photos,too. I then attach a 2nd adapter, FD to EOS, without the correction glass, (to minimize distortion of the image) to allow mounting this on my digital camera. (If the reversing adapter is selected correctly then this 2nd adapter isn't required, as the correct mount for the camera is already there) Very close focus is involved. Further more, a bellows or extention tube can be inserted between the camera body and the lens assembly for greater magification. Forget auto focus! Manual stopdown, metering and focusing give the best results here.Easy to learn and much more accurate. Be sure to check the picture results after each shot and take more shots then  normal and vary composition and exposure. Slight wind or any movements cause the subject to flow in and out of focus since the depth of field is shallow. Wind is real in the field! I usually shoot with the f stop at f4 - f8 range for best sharpness on sunny days.

Have fun .

Glen Rhinesmith