Obtained an old Tamron SP 500mm recently, the version without the tripod collar. When using on an NEX-6, I'm not too keen on the weight/balance. Looked for alternative collars (requires a largish 82mm internal diameter) to no avail. An adapter with integral tripod collar like this seems ideal: http://www.ebay.co.uk/itm/120787432239?_trksid=p2055119.m1438.l2649&ss I don't however wish to buy from a seller in China if I can help it... Anyone know of another source for that, or can suggest equally affordable alternatives?