The Sony A7S II has been a go-to mirrorless camera for underwater video since its release in September of 2015. For the Sony loyalists looking for top-of-the-line image quality in a small and compact form, the A7S II is for you. It embodies a 12.2MP full frame CMOS sensor and can shoot true cinema 4K video at 24fps, as well as UHD 4K at 30fps and smooth slow-motion video at HD 1080p video up to 120fps. Paired with an impressive 5-axis in-camera image stabilization you can get ultra-sharp, steady footage even when shooting hand-held.

Does GoPro still make the session?


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.)
The Blackmagic Pocket Cinema Camera 4K (BMPCC4K) is known as a disruptor camera, as it offers most of the features videographers hold in high regard at an impressively affordable price. The BMPCC4K has a Micro Four Thirds sensor, records 4K video at 60fps and even records RAW and ProRes files. This small, highly affordable cinema camera offers key features that were previously held captive by top-of-the-line, high-budget demanding cinema systems like the Canon C200, RED Digital Cinema Cameras, or the Arri Alexa Series. Recording in RAW or ProRes provides you maximum flexibility during post-processing and allows you to apply professional color correction to your footage.
There are three things that make the RX100 series one of the best underwater camera. First, their 1-inch sensor size is larger than most other compact cameras besids the G7X II, giving better image quality and better low-light performance due to a larger pixel size. Second, the auto-focus speed is faster than traditional compact cameras. Last, but not least, is its advanced video features, including 4K video.

Then there's resolution and video quality. You'll want a camera that can record in 4K for sure. The top-end models from DJI and GoPro offer 60fps 4K with digital stabilization that's absolutely incredible. They're also not limited to ultra-wide views; you can set a narrower angle to remove lens distortion, making them solid choices for vlogging and travel logs.

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