I just use the simple way cut the filter followed the shape of lens buttom and just use the thin tape stick it with the lens.I didn't know that you can replace the lens bayonet like the one on 8mm fisheye.Please let me know if you know how's it work?
I also used Magic Tape the other day to stick some ND gel to the back of my 7-14mm. It's fiddly and inelegant, but works OK. Use Scotch Magic Tape, not Sellotape, so it doesn't leave a residue.
Look here for the story of fitting the 8mm filter holder to the back of the 7-14mm. You need Panasonic part number VXQ1911 (and possibly more), which might be difficult outside the USA. Also I recall that it's not just a straight swap. A bit of fiddling/fettling is required? If anyone plans to do this, please keep us informed how it goes and where you got the parts. I'm interested.
I use photo style CinelikeD with some adjusting Contrast +2 , Sharpness +2,Hue +5 and some post color editing in FCPX.
Those are really unconventional settings. Seems like most users are reducing contrast and sharpness, and leaving hue at 0. But anyway if it works, it works. Here I'm still using Natural -2/-2/-2/0/0, and adding contrast and sharpness in post. I sometimes feel like just going with totally default Standard.
p.s. Olympus M.ZUIKO Digital ED 7-14mm f/2.8 PRO Lens coming end of June. USD 1299
I wonder if Nauticam supports it.