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using your digital camera as a webcam
whilst in-built laptop cameras and cheap webcams allow easy to use video streaming, the image quality and ability to customise the image colours, tonality, angle of view, viewpoint, and background blur control is made enormously better when using an interchangeable lens digital camera
BUT in general, you can't just connect your digital camera to a computer in the way you connect a webcam and expect it to work for live streaming
Your streaming software needs to be able to select your camera in its options - see below on how to achieve this.
Step 1: a suitable camera
A mechanism to expose the camera as a camera option for streaming software
creating better sound using an off-camera mic
improve the look by using better light sources
ensure your camera doesn't run out of power or shut down
ensure you have enough upload bandwidth to stream to the internet
software to stream your video