Digital cameras offer two great advantages over their conventional counterparts.
Digital film takes the form of card media.
I bought three 80-megabyte Compact Flash cards which provided me with 80 exposures per card in the Normal image mode. Once the images from these cards are loaded into the computer, the cards can be erased and used over and over again. Critics of digital cameras point out that the image resolution cannot match that of a conventional 35mm slide, and this is technically true. Before the trip, I worried that roughly 300 exposures would not be adequate to cover three weeks of shooting. But the ability to review, edit and erase unwanted images left me highly satisfied with my take at the end of each day.