The GH5s is popular for underwater video because the camera is at a great price point, the body is relatively small, there is a multitude of micro-four thirds lenses available for any lens requirements, the video bitrate is quite high, and camera supports many video features that other micro-four thirds cameras do not support. It crushes all other micro-four thirds cameras at high ISOs with respect to noise.
Despite having a cropped sensor the A6500 and A6400 boat a highly reliable focusing system made up of 425 phase detection points. Not only that but they are two of the lightest and most compact cameras on the list despite having a fairly competitive sensor pixel count. If you are an aspiring or professional video shooter, the Sony A6500 and A6400 prove to be a great option for underwater video.
The Nikon Z6 is the Nikon equivalent of the Panasonic S1 -- Nikon’s lower-megapixel version of their Z Series full frame mirrorless cameras. The Nikon Z6 offers a 24MP, full frame sensor with fewer, larger pixels than the Z7 making it a more favorable choice for video due to the low light advantages. One benefit of the Nikon Z7, as compared to the Panasonic S1, is its size. The Z7 is small and compact -- a major reason why people are turning from DSLR cameras to mirrorless cameras. The Nikon Z7 has phenomenal autofocus capabilities with 273-point hybrid phase-detection contrast autofocus technology. It tops out at 4K 30p but can natively output 10-bit 4:2:2 over HDMI in the new N-log color profile, promising greater dynamic range and flexibility in post. Beyond that, with its new firmware, it will become the first hybrid camera to offer RAW video output when coupled with the Ninja V monitor/recorder.
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There are some cameras that were made specifically for being used underwater for example the SeaLife DC1400. But, just from reading the mixed bag of customer reviews on Amazon, it’s clear that it’s not the best underwater camera for scuba diving. The buttons stick, the flash doesn’t work, the shutter delay is insanely slow… just a few of the problems you can run into.
So what makes a good underwater camera? In addition to image and video quality, there are several other important factors to consider, like the overall quality of the camera's optics, including zoom range and maximum aperture. The latter is crucial for low-light photography, as larger aperture typically results in better photos since it allows more light in. It also minimizes motion blur, making larger apertures perfect for action shots. (Note: The smaller the number, the larger the aperture.)
Canon is consistently a leading manufacturer of cameras and lenses in the video realm and the 1DX MkII is their flagship camera. The color science that is characteristic of Canon systems is highly sought-after and the sharpness of their lenses is not to be understated. If you are looking for a top-of-the-line DSLR that functions not only as an amazing stills camera but also as a professional-grade video camera, the Canon 1DX MkII is for you. The downside, is that the underwater housings are somewhat larger than the other housings listed in this guide.
Before you start digging into the reviews, a few notes on choosing a cam that's right for you. You'll definitely want to consider frame rate, expressed as frames per second (fps). Some action cameras offer up to 240fps recording, while others only go to 30fps. For standard playback, 30fps is perfectly fine. It's when you want to slow footage down in editing to create dramatic scenes that frame rate matters. Footage captured at 240fps can be slowed down and played back smoothly at one-quarter speed. You may also want to go for a cinematic look, in which case you'll want one that has a 24fps capture option, the same speed used by most Hollywood productions.