The wonderful sinuous shapes of Upper and Lower Antelope Canyons in Arizona are a magnetic drag to all photographers lucky enough to find themselves in the northern part of the state.

These images were made on film, so that long exposures, often of 30 seconds or more, were required. One consequence was to saturate the colours of the canyon walls, particularly where they were lit by reflected light. The real challenge though, is to find the composition that does justice to the shapes and colours that nature has provided - and which change throughout the day as the sun moves.

It is a long time since I visited these canyons and I understand that photography is now much more difficult, with even a ban on the use of tripods.