This is a picture of the mouth of Bracken Cave, while it was still too light for any bats to be flying around. The people at the top are standing in the briefing area, with the camera across the sinkhole at the main emergence viewing area. Photo taken with a Canon Elan IIe camera on a Manfrotto Wilderness tripod with a 50mm f/1.8 lens, Kodak Royal Gold 400 film.