I was with my family at a seaside, late and in darkness. My nephew and niece were playing in the water and running around, and I wanted to take picture of them, but my autofocusing system was taking too long to focus. By the time the autofocus system focused on my nephew, they were already gone. I also had my flash on, so that I could freeze there motion.
Is there any way I could take a picture of them while they are playing in the dark?
Would it works to set up manual focus with broad depth of field? For instance, at 50mm, f/16, 10 feet, i get about 9 feet of depth of field.
I have a Nikon D7200 with the 18-140mm kit lens.