Originally posted by ripper2860 I have the 52BB and it is a fabulous lens. Finding the 1:1 macro tube is extremely difficult and when found, crazy expensive. I would suggest just getting the Tamron 01-F 2x converter (readily found / relatively cheap) and removing the glass. It has been reported that the specs on a de-glassed 01-F is identical to the native macro extension tube and renders 1:1 macro. That's what I did and it works quite well.
I picked up a hazy copy of the TC. If I fail in dehazing it, deglassing it might be a good option. It you like being able to go from close-up to infinity, however, the extension tube route is a pain in the butt. Shooting close-up to macro only, of course, it's not a problem.