Panasonic GH4 with Canon EF lenses

[vulture]

I started to use my Canon EF lenses on the GH4 via Redrock  MFT Active Lens mount.
While losing the AF options of the GH4 (not a big issue for me), it's giving me usage of the full range of my EF lens range with full aperture control.
I am quite impressed with the results so far, especially with my prime EF 2.8/400, becoming a 2.8/800 on the GH4.
Anybody else with experiences on this set-up?

[Vladimirovich]

specially with my prime EF 2.8/400, becoming a 2.8/800 on the GH4.

just mount that on Pentax Q and by your logic (    ) it will become 2200/2.8

[Telecaster]

I've used my Nikon 400/3.5, sometimes with its 2x teleconverter, on Olympus E-M5 & E-M1 cameras. Image quality is excellent. With the TC I can resolve Saturn's rings, though actually locating Saturn with the lens/camera combo can be tricky. I need a spotting lens.     For my non-astrophotographical use, though, the 400mm is too big & heavy and has too much reach with or without the TC. I'm more of a 28–135mm (or equiv.) kinda guy.

-Dave-