You can change the focus on a camera. If the camera is focussed at a near distance, near things will appear clearly, far things will appear blurred. Focus at a far distance and far things will appear clearly, near things blurred. Telescope can only focus on very far things. Microscopes can only focus on very near things. They are good at what they do because the are designed to be able to focus well at those extremes, unlike a camera which is generally designed to focus in a range more similar to the human eye.
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