I have had my fancy camera repaired three times to no avail. Salt water is the greatest threat to standard cameras. It is possible to obtain cameras that are designed for hostile environments but these are costly. The camera I will use in this tutorial was purchased over ten years ago. It has been on many forays under extreme conditions and still works perfectly.
Digital cameras produce images that approach the quality of film.
I have limited experience with these. They capture the subject digitally so that you can download images into computers. There are positive and negative features of digital camera which can restrict their use.