Another one succumbs to the dark side
Lovely shots.
Same lens that I use most these days. IMO the perfect macro lens, balancing working distance, usability, and cost very well. Put 68mm of Kenko extension tubes on it, and can up to around 2:1 magnification. That's my favourite arrangement.
What ring flash do you have? There may well be an adapter you can buy/use with the lens' filter thread. That's how I attach the MT-24EX to mine.