I feel that neither the Aquatech's rain shield or Think Tank's Hyrdophobia were designed for manual focusing. While it's possible on the Think Tank brand, it's next to impossible with the Aquatech.
Since I manually focus all shots, I find this frustrating. I will continue using both of these (the Aquatech for shorter lenses, and Think Tank for longer) for shielding the camera body from rain.
I frequently use a Lee filter holder with an 4"x4" Singh-Ray ND filter. Unfortunately neither of these rain coasts can provide rain protection for them. I am forced to use an umbrella or whatever.