I have a Nikon 7100 , a wide angle lens (10-20) a 80-400 lense and an 18-200. Knowing there was a full moon last night I went down to the beach an hour before moonset but after only 5-10 minutes of shooting the moon was hidden by a bank of cloud untill sunrise. this was my first attempt to shoot a moonlit seascape . I used the wide angle lens at 15mm and f5.6. with manual focus and used a remote for six seconds. I found it really hard to focus and wasnt sure whether to focus on the moon itself. i managed to get a couple of shots in with the 18-200 lens before the moon became hidden. I shot at the full 200mm with other settings much the same. the longer focal length made it easier to focus. I was very disappointed with most of the shots. I would be very interested to know what settings others use for moonlit seascapes.