This is an image of the first-order Fresnel lens inside the Point Reyes Lighthouse on the western tip of Point Reyes, California. According to the Point Reyes National Seashore website, “the Fresnel lens intensifies the light by bending (or refracting) and magnifying the source light through crystal prisms into concentrated beams. The Point Reyes lens is divided into twenty-four vertical panels, which direct the light into twenty-four individual beams. A counterweight and gears similar to those in a grandfather clock rotate the 6000-pound lens at a constant speed, one revolution every two minutes. This rotation makes the beams sweep over the ocean surface like the spokes of a wagon wheel, and creates the Point Reyes signature pattern of one flash every five seconds.”
On Saturday evening, my Creative Landscape Photography workshop on Point Reyes was lucky enough to have the lighthouse opened for us. I shot this image handheld with my Nikon D810 and a 16mm digital fisheye lens (the interior space was pretty tight). I used auto-bracketing and burst mode. There were nine exposures, each at ISO 1250 and f/6.3, with shutter speeds ranging from 0.5 of a second to 1/500 of a second.
I combined the exposures using Nik HDR Efex Pro and Photoshop.