Quote:
Originally Posted by SiriusHardware
Edit: There now seems to be a bewildering array of directly attachable camera modules, in addition to the official modules. All depend on the Pi having the specific onboard camera connector, which not all Pi models do.
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Many USB cameras can be connected to the Pi's USB port too. So if you have one you don't need to buy a Pi specific one provided the one you have is supported (as most cheap ones are).
The Pi Zero has a different camera connector to the Pi 3/4 and a special camera just for the Pi Zero, which is cheaper, but there are also cables available to allow cross-compatibility.