After long deliberations I bought a Leitz R 2x tele-extender for my Leica Elmarit R 180mm f2.8. Quite a handful but great for long-range candids using the VF-2 on my OM-D. Builds up muscles. I invite any other users of tele-extenders/tele-convertors to post examples of their work here. I have been pleasantly surprised by the performance of this combination —*compared with the woeful results from a 3x [Soligor?] tele-extender on a 50mm f1.8 lens on my Miranda SLR 40+ years ago. Colour fringeing is an issue, which is why I like going to B&W.