Testing
First things first, my initial concern was flex, but even moderate attempts to find some give were unsuccessful. Prior to using this system, I had never felt that an L bracket was all that necessary, and the systems that I tried didn’t meet expectations. All ballheads have a drop notch for switching to portrait mode, and that pretty well served the purpose that I needed for shooting portrait compositions.
Landscape
Using the L bracket in landscape mode wasn’t much different from using any other bracket. It slipped in easily to the ballhead clamp, and never felt loose or had any wiggle in either the camera or the ballhead.

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