How do folks. I'm getting a Tamron 180mm Macro lens and have a couple of questions for people that use it. First up, can I use a teleconverter with it and my D90? I read that the Nikon TC won't work - how about the Kenko PRO 300 1.4? Has anyone tried this combination? I can't find the page where I read about the Nikon TC, but apparently there's a bit that sticks up and prevents its use with third-party lenses. It was on the internets so it must be true. 
Also, can anyone recommend a padded case for the Tammy please? Thanks in advance.

Also, can anyone recommend a padded case for the Tammy please? Thanks in advance.