The Keychain cameras of the moment, as opposed to those in the cube format GoPro Session, are capable of filming in Full HD at 60 frames per second. Their characteristics are planned for fast flights like racers. Overall, these are the same for the 3 cameras. But as always, it is the small details that make the difference. How was the ranking established? I have assigned a weighted score to each characteristic, which gives you a score by adding all the points. But do not give too much importance to these figures: the weighting is different according to what you expect from a camera, and according to what you consider essential or prohibitive. A good idea is to change these notes according to your own criteria.
The ergonomics
The prominent buttons are a concern: it is all too easy to press it, tightening a Velcro or simply manipulating the camera. Only the RunCam 2 is distinguished with buttons that do not exceed. The settings are numerous on the 3 cameras but only the RunCam 2 and Legend 2 can be configured directly from a smartphone, in the field. For the Mobius 2, you have to arm a PC under Windows! There are software for Android that work with the help of an OTG cable, but nothing for iOS. Good point for the RunCam 2 which offers the settings of the camera with both keys, taking advantage of the USB video output. Special mention for the autonomy of the Mobius 2, which exceeded 2h20! Another special mention, but for the RunCam 2, this time, for its removable battery. A feature that allows you to buy extra batteries and never run out of energy when you want to take off.
Solidity ?
I did not do a crash test on the 3 cameras. User feedback is very varied and does not lead to conclusions: a slight shock can ruin a camera while the same model comes out unharmed. On the other hand, the lens is very exposed on the Mobius 2, while it is protected (a little) by a cache on the RunCam 2. Note that Foxeer provides rubber protection, not necessarily very effective. In case of violent shock, the camera has every chance of being ejected from the multirotor. To find it can take lead! The RunCam 2 is available in orange, which makes it possible to find it much faster. Good also for this camera against its competitors: the microSD memory door is protected by a cache. You do not risk losing this card, almost impossible to find in grass. Good idea for the Legend 2, that it is possible to make sound to find it. But it is necessary to succeed in capturing its wifi signal to connect the application for smartphones.
Video quality
The most important recording mode is the 1080p at 60 frames per second: it is the one that ensures the best fluidity in the images, especially when the movements are fast. The 120 fps and 240 fps modes are designed for slow motion - this is an interesting bonus. The bit rate is important to avoid too much compression of the images, and thus "patches" of pixels that make the image blur and reduce its sharpness. The Legend 2 offers the best speed, but the Mobius 2 has a secret weapon: H.265 encoding. At the same rate, it compresses videos more efficiently than the classic H.264. But it is sometimes complicated to display H.265 videos, especially on slow computers.
Video quality, continued
For the rest, everyone has his idea of color management, sharpening (or sharpness), speed of measurement of brightness: watch the test videos, shot with the default settings. The WDR and HDR modes are interesting because they often "uncork" an image that is too dark, but they more or less distort colors and often introduce unpleasant halos on overexposed areas. The digital stabilization of the images and not adapted to the flights in multirotors, it has little interest. The 3 cameras broadcast a real-time video feedback, via the USB connector, with a cable supplied in the box. But with a latency of more than 110 milliseconds, the Mobius 2 does not offer real real time. The latency is more correct for the Legend 2 and especially the RunCam 2.
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