Just measured: The total length is 12,8 cm. Maybe 12,9 cm, difficult to judge exactly with a ruler due to the curved front element.

6 hours ago, TimG said:

 

Yeah, sounds wise, Massimo. Even then I'd check!

I use the new Kenko

I paid a very low cost for a new unit I don't see the benefit of saving little for the old one

The performance is very very good better than the Sony TC 1.4x