The jinfinance one on ebay is ok. I have 3. The only odd thing is that I ordered 1 first and then 2 much later on (around 1 yr), and only the 1st order adapter is able to mount on direct to the camera when attached to the lens. The other 2 are need to be mounted onto the camera 1st, followed by screwing on the lens. There are some finishing differences between these 2 batches, so i think the tooling probably changed in between my purchases.