I have the first G1/2 adapter that came out of China on my 90mm G1 lens and the newer Kipon adapter with the gear on the 45mm lens. Why? I had so much trouble getting the first one off of the 90mm lens that I just bought the other one. Fortunately, I bought the Kipon adapter before they raised the prices. I like the Kipon adapter much better than the other one, but if it gets too close to $ 200 and the first non-geared version stays down around $70, then I'd buy the non-geared one again. P.S. Yes, I suppose I can get the @3$@!* adapter off the other lens if I keep trying, but it's just easier not having to take either one off.