Yes, it is a T mount lens. After reading the comments, I tried the lens again. I found that I was actually following the instructions correctly, but could not see the results of my shots because of lighting issues. I then waited for a brighter lit day and that worked. It def requires the aperture setting to be at maximum or the shots are dark. Bottom line, this lens has a very limited use maybe for bird watching in Florida, lol. Live and learn. Next time I'll come in here before I buy. I appreciate all the effort the five of you put into answering my question. Take care:chuncky: