I am planing to pretty much retire my Panasonic 7-14 with my GH5 system for underwater use. Its just not fast enough if the conditions are less than perfect.
As a replacement, I plan to use the Panasonic 12mm 1.4 Lens, either with the 180 Nauticam Optical Dome (with 85 to 120 Step-Up Knob Adapter) or alternatively with the 140mm Optical Dome for M85.
With the 180 Dome, the lens seems to stick slightly out, but a 20mm Extension ring on the other hand looks too long. On the 140 Dome, not sure whether its the 17mm or the 20mm extension ring.
Any advise would be much appreciated.