All of them are fairly expensive. They can cost as much as a DSLR if not more.
You'll find several other brands that claim to be waterproof up to a particular depth, but all they offer is what seems to be a cheaper and less durable plastic housing. They would seemingly work all right in, say, swimming pools, but if you're planning on taking it to a larger body of water I wouldn't exactly recommend them.
A couple of examples:
Please bear in mind that I've never used any of these products. However, a few colleagues have used equipment from Aquatica and Ikelite and have positive reviews about them. I'd be very cautious about the cheaper 'plastic bag' kind of products.
Hope that helps,
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Prashant S Akerkar
I'm a professional photographer and I can answer questions questions relating to SLRs (35mm or DSLRs) and general photographic technique. I'll be happy to share my knowledge with anybody who's looking to learn or is just plain confused about something.
Questions about studio lighting, studio flashes, and flashguns are also welcome. Questions about theory (e.g. colour theory, guidelines behind composition, depth of field, etc.) are welcome as well.
Digital photography also involves some amount of post-processing using an image editing application such as Adobe Photoshop; a program that I am proficient with.
I cannot answer typical generic questions, viz. "Which is the best camera?," as the short and sweet answer to questions such as those is "There is no such thing." Furthermore, there is a lot of literature available on the web pertaining to the same. Also, please do not ask me for camera recommendations based on a budget.
I have been passionately taking photographs since I was 13 years old. In totality, I've been involved in photography in one way or another for over a decade. I've used various cameras (and lighting equipment) over the years, including but not limited to Minolta/Konica Minolta, Nikon, Canon, and Mamiya.