Any one using the Canon 24-70 f4L? Have questions!

I currently use Ikelite housing and ports for a 6D, switching between a 16-35 f4L and 100L macro. I was looking into the 24-70 f4L lens with my 8" dome because of its zoom range and macro ability as well. The only issue I have is that from what I read, you have to trigger a switch to reach macro range, which cant be done underwater... has anyone found a way to work this with their port? Or am I misinformed about the issue?

Thanks for any help!

I have used the Canon 24-70/4 lens under water. I used it for many of the underwater shots taken this year in Hawaii that are on my website. I used a Seacam Compact Port. It may have a radius that is the same as an 8" hemispherical dome but do now know for sure. I used the lens with a Canon 500D achromatic diopter to focus closer than the minimum focus distance. I had to apply lens correction in post to fix a bit of vignetting. The macro feature is useless in a housing.

Dang... thanks for the help! Seemed like a nice option to get a zoom range and decent macro... Oh well!