As stated by others the 12-50mm is a good all-around lens. Good, not great image quality but the flexibility outweighs the minor image quality loss
60mm is a great macro lens
12-40 pro is awesome, not quite wide enough at times, but you can zoom in for medium to reasonably small stuff.
8 Pany fisheye was nice, but sold it to a friend as I didn't like the results with acrylic mini-dome. With my murky local waters the thickness of the dome would often catch the light from strobes (poor placement on my part?)
Recently got the Oly 7-14 Pro for videowork with the GH5 on some deep, dark glass sponge reefs. Had hoped the f2.8 would help gather light as it does with the 12-40 Pro.... Unfortunately with video the corners are garbage below f5.6 or 7. Not even useable if you are relatively close to the subject.
Corners may not be as bad with still images but I would not recommend spending the extra money on the Oly over the Panasonic unless others have had significantly better results.
Good luck with your decisions.
I shoot with the EM-II recently upgraded from the EM5-II. I have the 60mm macro and recently added the Panasonic 30mm macro. I shoot mainly in the temperate waters around Sydney and found the 60mm problematic, you had to back off too far for many subjects and when focusing out from a close subject it would tend to lock onto floaties instead of the subject, the 30mm does not seem to do that. The EM-5 II would do that much more so than the EM1. Of course in clear tropical waters it will be different and less of an issue. You will probably want a focus light particularly with the 60mm..
On wide I shoot the 12-40 and Pany 7-14 in the same Zen 170mm type II dome. If you study the port charts you'll see if you got the N-120 version of that dome it will allow you to shoot the 12-40, both 7-14 lenses and even the 8mm fisheye in the same dome, though you do need to source a custom 30mm N85-N120 adapter which I have seen mentioned in other threads on this forum. this is theport chart for Zen:
Again the choice of wide lens depends on what and where you are shooting, the ifsheye is especially challenging, but has its place for things like big animals and CFWA, definitely not a point and shoot lens. In Sydney I tend to use the 12-40mm lens the most, due to water conditions.
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