I'm an fisheries scientist based on the West Coast USA. Traditionally, I have focused my underwater work in rivers of the Pacific Northwest, but recently been shooting pelagics during grad school in California. Soon, I'll be moving to Alaska and I'm looking to upgrade my setup for my new R5II.

For the past 5 years, I have shot with an R6, 8-15 F4, ikelite housing, and 8" dome. As I switch to an aluminum housing for the R5II, I'm prioritizing compact size to reduce drag in river shooting. Any tips here? I was recommended the WWL-C + RF 24-50, but read dismal reviews here. Now, I have shifted towards the Marelux housing and 140mm dome with my 8-15. I'd entertain a wet lens setup, if the size and IQ are competitive to the 8-15 fisheye & 140mm dome.

Any ideas are appreciated!

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The 8-15 and 140mm seems like the most sense to me, especially since you have the lens and can add a TC.

I do some casual river snorkeling in the PNW but haven't been able to shoot a salmon spawn yet.

The WWL-C is actually great, but would not work well for salmon as you are never deep enough to flood and remove all the bubbles from the wet mate optics.

And 8-15mm in the 140mm dome is my choice for snorkeling or shallow work. I've been shooting it with a TC recently and it is very good.