When I’m at a horse show and some class is under way, I’m usually concentrating deeply on the horses and riders and on what’s going on around me. At the same time, I’m reviewing the direction of the sun and harsh shadows, or clouds and softer shadows. Not to mention angles of approach, backgrounds, warnings from spectators, or any other clues to where the next opportunity or obstacle might be. Because of this, I move around frequently while I try to anticipate where I should position myself to get the next good shot…