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Even if you shoot in the same environment, there is a difference in image quality between a single-lens reflex camera, mirrorless camera, and a web camera. One is the difference in hardware such as image sensors and lenses. But just as important as the hardware is the difference in configuration, or software. No matter how much attention is paid to the lighting, if the settings are not suitable for the lighting, the image will not come out as expected. Most of the previous webcams were weak in this setting aspect.
On the other hand, the FaceCam sensor itself is made by Sony and has a high quality, but its major feature is that you can specify ISO sensitivity, shutter speed, and white balance like a single-lens reflex camera. There are other web cameras that can adjust the white balance with the attached app, but it seems that there are few other products that can specify ISO sensitivity and shutter speed.
Also, FaceCam is epoch-making in that it can record those settings in the flash memory of the main unit. It's a feature of OBS that allows you to manually adjust things like white balance and exposure, but when you exit OBS they revert to their default values. However, with FaceCam, if you make detailed settings with the included software and save them, you don't have to make adjustments every time.
Using OBS as evidence rather than theory, I would like you to see images captured using Sony's mirrorless camera "α6600" + Sigma lens "SIGMA 16mm F1.4 DC DN" and images captured with FaceCam. . As will be described later, by blurring the background using NVIDIA Broadcast, you can see that the FaceCam image is finished at a level that is quite close to mirrorless. We will also introduce specific setting methods.
Comparison of α6600 + SIGMA 16mm F1.4 DC DN image and FaceCam image. Background blur by NVIDIA Broadcast is applied to FaceCam