I too will caution against reliance on the WWL for orcas in Norway due the "bubbles" issue, needing to burp the lens. And I speak from experience. I have been to Norway for orcas many times, including last year when I shot the Sony A7RV and the WWL1. I will not do that again. Next time I will go either "dedicated water contract lens" mounted straight onto the housing, or back to old fashioned dome, or a combination of both. HCLdiver- as you know, sometimes you slip into the water and have time to organize yourself before you need to shoot. In this case, you have time to remove the WWL and reattach to make sure no air is trapped between flat port and back of WWL. But, sometimes you do not have time to do that, as you need to start swimming and or shooting immediately upon getting into the water. And, even when you have time, because of the cold water, cold air, cold fingers, thick gloves etc. the delicate operation of removing and reattaching WWL in the water is risky. I am clumsy, and dropping it (obviously, attach it to housing with a lanyard) is very real...
I have used many combinations in Norway. With Canon, 16-35 f2.8 Canon behind a 230mm dome at f2.8 and f4. Same lens behind smaller 170mm dome. Also the 16-35 f4 lens. Canon 8-15 f4 fisheye behind 140 and 170 domes. Canon 15mm 2.8 fisheye behind 140 and 170 and 230 domes. Nikon D850 with fisheye, rect zoom, etc.. Nikon D500. And Sony A7RV with 28-60 and WWL1. And I have never been fortunate to have ASA 800 light at 70 degrees north in NOvember. Most of my shooting is ASA 3200 to 6400, trying to keep 1/100 shutter speed or so. (ASA 1600 is lucky, in my experience.) So lots of wide open and near wide open.
I did not like the noise generated by the Sony A7RV at ASA 6400 and 10,000 with the 28-60/WWL when on a baitball with orcas feeding late in the day while it was snowing... Super dark conditions, yes, definitely not ideal. But that is a summary of this exercise. Visibility, light, time, action, distance, shooting angle etc are very, very rarely ideal, so you have to take what you get. The noise was more objectionable (at least to me) with the Sony setup than with either Canon 5D4 and Nikon D850. I personally feel that 60mp is just too demanding.
Remember, the moment you zoom in from 28mm the lens stops down. So, you are rarely shooting at f4 unless you leave the lens at 28mm and shoot 130 degrees.
In summary, I would take both, and see what you think about the 28-60 and WWL and A7RV at wide open and high ISO... butd also have that 16-35 2.8 (and dome) with you... Being able to-- when necessary-- shoot at f2.8 or 4, rather than 4/4.5 or 5.6, keeps your ASA a stop or two lower for cleaner files- or gives you faster shutter shutter speed. Both can be (IMO) very important. Sometimes you have whales stretching to the corners/edges of the frame, and sometimes you are super close to the baitball and whales... but usually, most of the time you are shooting from at least a few meters away, sometimes farther.
I wish you best of luck this year. Sadly, I will not be there this year. But hoping to return to Skjervoy in 2026.
Sincerely,
Brandon