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For more than 3 years I have been flying an f450 type quad. During this time it changed 3 sets of engines, 2 sets of ESCs and propellers from cheap Turnigy to T-motor, finally settling on the E300 kit from DJI. Such kit can be ordered on ebay. So, why didn’t I buy a Phantom?
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Probably, everyone who has a GoPro or another waterproof camera tried to make such picture.

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However, when you dip the camera into the water, you see only a huge blurry water edge that overlaps everything above and below. Water appears to be too close to the camera lens, and therefore, it is out of focus. A special “hemisphere” is needed to avoid this this effect.

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