Kartchner Caverns

The formations are unbelievable. The dim light is a photographer's challenge. Tripods were not permitted on this tour so all the images seen here were with my camera hand-held. I set my digital camera at the highest ISO rating (1600). Still the exposures were mostly around one-fifth of a second with the camera lens at its widest aperture. (Dimmed lighting is necessary to hold down the heat and to inhibit growth of algae.)

I was able to obtain some sharp images by bracing my elbows on the railing which follows the path through the cavern; however, many of my photos show camera movement and are unusable.


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