Originally posted by koper if the teleconverter dose not work with SDM lenses,that means that he can not work with
You are spreading misinformation.
If a coke bottle had K-mount, this unit would focus it ;-)
This is because it does not depend on the lens it is mounted with. It is the TC itself that does the job. All it needs to work is some light to work with, any f:4 or most high contrast f:4,5 lenses will do.
I have tested it with every SDM lens I own. This includes 16-50, 50-135. and 300.
I believe I've tried it with 60-250 to, but I'm not 100% sure about that.