Tripod ring and macro speedlite note A tripod mount ring is very helpful and optional for this lens. You can't use the old ring on the new lens. The old ring was the "Tripod Mount Ring B (B)". The new one is D (B). It looks a little easier to put on. Amazon doesn't list the new ring for sale. I have seen it elsewhere but not in stock.
Also, the filter diameter is larger (67mm vs 58mm) than the old lens so you'll need to get a special adaptor "Macro Lite Adaptor 67" in order to attach the MR-14EX or MT-24EX.