Contrary to the experience of some others, I can find nothing but praise for this adapter.In use with an Olympus OMD E-M1 mark III and Canon FDn lenses, the adaptor has no play whatsoever on either camera body or lens, when mounted.
Before purchasing, I had watched several online videos explaining how to enable “off-camera” aperture adjustments on the FDn lenses, but have found that the easiest way to achieve this was to move the lens aperture control ring away from the green “A” setting and onto any actual f-stop setting, before taking the lens off the Canon camera body. (I am fortunate in still having a Canon A1 which enables me to do this).
Having done that, with the adapter then mounted onto the OMD body, and with its lock ring set to the “open” position, it is simply a matter of attaching the FDn lens to the adapter, and sliding the lock ring to the “lock” position.
That done, full manual aperture control of the lens becomes available by rotating the lens aperture ring to whichever aperture setting is required.
Note that although the E-M1 mark III body has inbuilt image stabilisation, in order to make the most of that facility, the camera needs to be “told” what focal length of Canon FDn lens is being used. (It is a simple matter to input that information via the OMD’s custom menu settings).
Enabling “focus-peaking” on the camera body makes fine control of manual focusing pretty much failsafe! (NB: I’m not sure if focus-peaking is available on all Olympus camera bodies).
Results thus far have been very good indeed, and have breathed a new and very useful life into my old FDn lenses. Exceptional results using my erstwhile “pride and joy” Canon FDn 85mm f1.2.
Well done to K&F Concept for making a good quality, easy to use adapter, at an affordable price!