Some other things to add to Steve's comments...
The Lim bowl is 32 inches but tapers down to the bottom. The darker blue works best with a flsh. Natural light as always is best for photos.
The Hydra Bowl similar to the Hydra bowl is a lighter blue. I like this as it lets a bit more light in so a flash is not needed. The sides are straighter so at bottom it is the same as the opening of the bowl.
One thing that Steve brought up is that fish will not jump if water is barely coverering the dorsal. I think this works the majority of the time. I have seen fish jump regardless of height of water. But one thing is certain even with a poloraized filter, is that when the water is too low then it makes it more difficult to take a picture because of too much ripple in the water. So it is better to have more water in it for photos.
As said in a previous post. This is not to take away from Lims tubs. I think they are great. I bought my Japanese tub which is not very economic but wanted one for taking photos and for the comfort of fish to not crater in the ground.
My experience is with photos is when taking pics with an extra hand is easier than by yourself. When your by yourself the comfort issue is there knowing fishy cannot make it out of the tub
JMHO
Joe