Jenkin said Rose of Nevada was the largest film he had made, with a 140-strong crew that included film students from Falmouth University, where he is an associate professor of film practice.
He said filming in the sea was particularly challenging.
“The one thing you cannot mess with is the tide, and the sea in general,” he said.
“You can work with the weather, you can build gazebos to shoot under if there’s too much rain or sun, but with the tide there’s nothing you can do.
“You cannot control the tide and sea.”