The first rule of thumb is to take lots of pictures. In this digital age, who cares? What does it cost to take 400 pictures? Essentially nothing! So, I took about 400 pictures and then deleted all the ones I didn’t like . . . which was, oh, about 300 of them! I used my 55-200mm lens the entire day. And, I probably should buy a tripod . . . you will soon see why!
The second lesson I learned is to keep the horizon horizontal. It seems basic, I know. Bear with me.
Clearly I have demonstrated that a crooked water-sky line ruins the picture!
These turned out a little better . .
The third lesson I learned is that it is really hard to photograph a rainbow. I was using auto-focus and the camera didn't know what to focus on. Even on manual focus, I didn't know what to focus on! Trying to decide which particle of water was the focal point was . . . a little schizophrenic!