I'm using this lens and will post some pics from it soon.
Right now I'm wondering if anyone has used a 1.4x tc with the lens. The Leica version protudes far too far to work. It looks like the tamron sp or kenko pro 300 will work if just barely. I have a sigma but the front element is flush with the flange and that is too far out as well.
A second issue is given the various enlarging algorithms available how much good is a telextender? It might be a better idea to leave the extending to post rather than using glass, losing a stop and having to take it on and off in the field.