45 minutes ago, ChrisRoss said:
I don't think there are really any limitations with Canon, the 28-70 lenses are a well proven solution and you can use the native 8-15 fisheye with it which with a 1.4x is a well proven direct replacement for the Tokina 10-17 with better optical quality. To use that with Sony you need a Sony-Canon EF adapter.
This Nauticam Thailand page linked above page has images shot with Sony lenses, however there is also a page shot with Canon lenses, find the album on this page:
https://www.facebook.com/media/set/?vanity=NauticamThailand&set=a.494436099369728
You can use the 8-15 lens in a 140mm dome port.
The thing to remember is that everything is a compromise with UW optics, the use of lenses underwater is not a design consideration at all when these lenses are produced and we need to accept that there is no really perfect solution. For still images any of the brands will have a solution that makes great images. You could sell off your R5 at a loss and end up with more or less the same images from a different camera. The WWL-1 works quite well with the little Sony lens, but I believe Interceptor has shown that the optical quality of the lens while acceptable is not the best around.
Thank you for the added link, I had not seen the Canon comparison, Thank you. As for the replacement of my 10-17 for APC, I do not need direct replacement. I used the Zen compact glass port for travel-ability, I am not interested in a large diameter dome, that is why the 28-70 with a WACP-C seemed a good option. I realize the weight of WACP-1 & C are heavy but somewhat more compact in diameter than a wide dome, compact would be my preference as I enjoyed using my Zen port with the 10-17. I am looking for improved sharpness from a new investment, again takes me to WACP-1 or more preferred the cost and smaller size of the WACP-C with the R5 compared to the WWL lens with anything. I have even considered the EMWL lens set up, however, the EMWL is obviously completely different type of wide angle and looks a bit of a challenge to have out front of camera and probably not any over all weight reduction when packing for travel. As time table to purchase is closing, I have cold feet. This past week received a report by somebody very reputable, they were disappointed in performance of WACP-C and the only way to go was WACP-1 on Canon or a WWL-1 (must be on Sony) as WWL-1B is not an option for Canon as I quickly learned with the help of this forum after my post. Everything a compromise, you have correctly stated. Shaving off 50-100+ mm in overall size and a couple pounds of weight by rethinking about an R7 or Sony a1, maybe just stick with the R5 and continue to manage the size and weight. I guess too much stuff to pack & haul is the burden of the addiction to UW Photography. If I was really serious about trimming my kit down, would/should have gone to Micro 4/3rd's kit. Once we invest in a housing that matches camera body, at least in my case, is a many year investment. Making a $14,000+ cost, a bit of a serious purchase. I thank you very much for your input, has been helpful in trying to move forward with purchase of housing and port(s).