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I bought this camera before a recent trip to Egypt in June specifically for the purposes of underwater photography for my first time in the red sea - and I am so glad that I did!
I already have an excellent Samsung digital camera, and bought a protective underwater case for it on ebay - waste of money, I couldn't get at the buttons properly and the plastic over the lens wasn't clear enough for good quality shots, so I decided to invest in a camera that could be completely submersed without the need for a protective case so all of the buttons were accessible.
There aren't really that many on the market, and after much deliberation and searching on the net the Pentax appeared the most capable without being too expensive (some of the professional ones are hundreds and hundreds of pounds)
First impressions out of the box were very good - very robust camera, small enough to fit in your pocket, comes with a useful clip and as I bought mine from pixmania they included a really useful lanyard in the box, which was very useful underwater (I tied it securely round my wrist while snorkelling, as the camera will sink underwater if you drop it)
It's very easy to use and the menus on the camera are very simple, I was impressed with the wide range of settings it has, to name a few, sport mode for fast moving action (used this at the olympic football and it's fab), pet mode which captures great shots of your pets and has a kind of motion sensor and produces great quality shots of those hard to capture pesky critters, and it has specific underwater settings for still shots and video which compensates for the different light under water. It also has settings for very dark and very bright settings - all you'll ever need really.
Underwater I was extremely happy with the pentax - the battery and memory card slot is securely sealed from moisture getting in with rubber seals and I have had no problems with the display or lens misting up as I have read in previous reviews for this product. I was very careful to not open any compartments without being sure the camera was completely dry.
The shots of the tropical fish in the red sea we took with this camera were phenomenal, I didn't expect it to be so good - the face recognition worked in the same way underwater to focus on the fish, picked up on all of the amazing colours of the fish and coral and the deep blue of the sea. The ease of use was a blessing, as the last thing you need when you are underwater near coral is to be stressing about making your camera work and faffing with buttons - it was as simple point and shoot. We even used it in the swimming pool. The underwater video even picks up audio really well.
We took this camera everywhere with us on holiday, we weren't scared of getting it wet by the pool or the beach, there are no moving parts so sand can't get into it.
It's really been the best purchase I've made in a long while, so much fun to be able to capture images underwater, we also take it on days out, camping etc, as it's perfect if its rainy as it won't get damaged.
Apparently it's crush-proof as well but I have no intention of standing on it anytime soon :)