The Logitech C920s PRO HD Webcam is a fixed 1080p camera with a physical privacy shutter on the lens, a glass lens with autofocus, a stereo microphone and a 78 degree diagonal field of view. It records 1080p at 30 fps and 720p at 30 fps, and no 4K mode is recorded for it.
This review works from the specifications recorded against the product, each carrying the manufacturer page it was read from. No camera was connected for this page, so nothing here describes how the image looks, how the autofocus behaves or how the microphone sounds.
What the camera records
The recorded resolution is 1080p at 30 fps, 720p at 30 fps. The frame rate is 30 fps at both, and that is the first thing to notice. The Logitech Brio 4K in the catalogue records up to 4K at 30 fps and 1080p at 60 fps, and the Elgato Facecam records 1080p at 60 fps, so both of the other cameras record a higher frame rate at some resolution.
The recorded focus is autofocus with a glass lens. The Facecam records a fixed focus prime lens and the Brio records autofocus, so the mechanism here is a recorded difference between the three cameras rather than a matter of taste.
The field of view, and why the same number means different things
The recorded field of view angle for the C920s is 78 degrees diagonal, one fixed figure. The Brio 4K records 90, 78 or 65 degrees as three presets, and its field of view is recorded as adjustable. The Facecam records 82 degrees diagonal with a field of view adjustable in software.
So the 78 degrees on the C920s is a single fixed diagonal angle, and the 78 degrees among the Brio's three presets is the middle option of a set that opens to 90 or narrows to 65. The same number describes two different things, and a buyer comparing them on that figure alone would be comparing the wrong thing.
The shutter
The recorded privacy shutter is yes, a physical shutter on the lens, and a physical privacy shutter appears in the recorded feature list. Nothing in the record is ambiguous about it: it is a shutter that closes over the lens.
The catalogue holds no privacy shutter specification for the Brio 4K or for the Facecam. That is an absence in the record rather than a finding. It does not mean either camera lacks a shutter, it means this catalogue does not hold one for them, and the question has to be put to the manufacturer for those two.
The microphone, the mounting and the cable
The recorded built-in microphone is yes, stereo, with a range up to 1 m, and a built-in microphone appears in the recorded feature list. The Brio records a built-in microphone of dual omni-directional type with a range up to 1.2 m, and the Facecam records no built-in microphone at all.
The recorded mounting is a universal mounting clip that fits laptops and monitors, and a tripod is not included. The Facecam records a monitor mount and a tripod thread, which is a different arrangement of mounting, and it records USB 3.0 or better over Type-C where this camera records an attached USB-A cable.
The recorded cable is 1.5 m, attached USB-A, and the recorded USB connection is USB-A. The recorded dimensions are 43.3 by 94 by 71 mm including the mounting clip, and the recorded weight is 162 g, 5.71 oz. The recorded operating systems are Windows 8 or later, macOS 10.10 or later and ChromeOS.
What this camera is for
The recorded intended user wants a fixed 1080p camera for calls and streaming, with a shutter they can close without unplugging it. That is what the recorded specification supports: a 1080p image, a framing that does not need setting, a microphone recorded for a call at a metre, and a shutter that closes over the lens.
The trade is the frame rate and the fixed field of view. If you want 60 fps at 1080p, the Brio 4K records it, and if you want to set the exposure by hand, the Facecam records that, though its manufacturer has discontinued it. What the record cannot settle is image quality, autofocus behaviour and microphone performance, because none of those have been measured here.