Here's the setup for a recent shot. My tripod was as low as possible and I had to dig the center column into the sand a bit. I composed while kneeling in the wet sand as the tide was creeping up behind me. I got quite dirty.
Camera is a Mercury 4x5 equipped with a 47mm XL. Focused using a helical set at about 5 feet and stopped to f/22.
And the result:
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