The Markins Quickshoe has a useful safety feature:
That's a spring-loaded pin so that if you have a flat-bottom plate you can still use that shoe. But the Really Right Stuff L brackets and others have hollowed-out areas and the pin acts as a safety stop in case the shoe works a little loose...
The RRS S2 L bracket has a problem with the Markins 60mm shoe: the L bracket dovetails are small and the safety pin winds up *outside* the dovetail when the camera is in the on-axis centered spot of the quickshoe. Markins has a 48mm shoe but I'm not sure if the pin if moved close enough to the center to eliminate this issue.





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