SJCAM
SJCAM SJ20 Dual Lens
Two lenses on the front, and neither of them is for 360 capture. One is an f/2.0 daylight lens; the other is an f/1.3 night lens, and the camera switches between them. It and the newer SJ30 are the only cameras in this catalogue that answer low light with a second, faster lens rather than a bigger sensor or noise reduction, and for night riding or filming from a car that is a genuinely different answer. The cost shows up everywhere else: each lens sits on a small 1/2.8-inch sensor, 4K stops at 30 fps, the bitrate is 25 Mbps — the lowest figure in this catalogue, and low enough that fast motion visibly falls apart — and there is no horizon lock. It did surprise on endurance: in road.cc's four-camera drain test it stopped within three minutes of the DJI Osmo Action 5 Pro, about half an hour after the Insta360 Ace Pro 2.
Sensor area against the rest of the catalogue
Derived from the standard optical-format table rather than copied off a spec sheet, because makers print a fraction that hides it. The table and the arithmetic.
Specifications
Features
- ●Two lenses: f/2.0 for day and f/1.3 for night, switched in software
- ●4K30 with 20 MP HDR stills
- ●Dual screens and dual batteries
- ●Six-axis gyro stabilisation
- ●8x zoom and a 135° field of view
- ●Case rated to 40 m
Strengths
- +The f/1.3 night lens is a real optical answer to low light, not noise reduction
- +Outlasted the Insta360 Ace Pro 2 by about half an hour in a same-conditions drain test
- +Dual screens and dual batteries as standard
- +Mounts on the GoPro fingers every clamp and harness is built around
Drawbacks
- −25 Mbps ceiling — about a fifth of most flagships', and fast motion smears at it
- −4K caps at 30 fps and there is no horizon lock
- −No bare waterproofing; the 40 m case is mandatory near water
The strengths and drawbacks above are drawn from the manufacturer’s specifications and published reviews. No body of owner reports for this camera has been read, so nothing here claims to speak for its owners.
What owners say
No owner discussion has been collected for the SJCAM SJ20 Dual Lens yet. The pros and cons above come from the manufacturer’s specifications and published reviews. Rather than fill this space with invented sentiment, it stays empty until there is something real to put in it.
SJCAM SJ20 Dual Lens, head to head
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