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 next most immediate specification to consider would be the frame rate that your video camera allows you to record in. Top-of-the-line video cameras record at 4K resolution and 60 frames per second (fps), giving your footage that smooth, slow-motion cinema look that everybody loves. This is a highly sought-after capability and only a select few cameras on the market (excluding high-end cinema systems) provide this feature.
The TG-6 can capture excellent 12 MP stills in up to a whopping 20 frames per second, as well as ultra crisp 4K video via a 4-times magnification optical zoom lens with f/2.0 aperture. Microscope mode for ultra close-up shooting is also among the camera's features, as is the ability to capture panoramas and time-lapses. Advanced photographers have the option to save their images in RAW file format for more extensive edits.
How much is a GoPro 7?
Action cameras like GoPros have their advantages too though. They're generally much smaller than waterproof compacts, making them lighter and easier to mount via a chest harness or helmet mount or similar. The best action cameras also tend to have better video specs, offering pristine 4K in high frame rates, which many waterproof compacts currently lack.
What is a good cheap action camera?
The feature-set and price point of the DJI Osmo Action make it pretty obvious from the get-go that it's an attempt to undercut the GoPro HERO7. Does it succeed? Like all things, it's complicated. The front-facing screen is a boon, the stabilisation is just as silky smooth as the HERO's, and it's wallet-friendly price is nothing to sniff at. That's not to say it's perfect; there are a few lag issues at high resolutions, the app can be unreliable, and video from the HERO is a touch flatter, which counts in professional realm when it comes to the grade. For an affordable alternative to the HERO7 Black though, the Osmo Action is a fantastic choice.
The BMPCC4K has a built in 5” monitor, which makes viewing and framing your subjects underwater a breeze. The LCD screen on the BMPCC4K is lovely -- it’s sharp, bright and has good contrast. The BMPCC4K has no in camera stabilization, but this can be solved in post-production with the free Davinci Resolve subscription that comes included with the camera. Also, the BMPCC4K only has single-point autofocus, which is challenging when shooting video underwater. The solution to this, which most videographers prefer anyway, is to use manual focus. With the Nauticam BMPCCII Underwater Housing, there are numerous MFT lenses that Nauticam supports manual focus for. To see a list of supported lenses with the Nauticam BMPCCII Underwater Housing, see our Nauticam Port Chart.
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.