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You really need to zoom-in on an object at very close range to show someone something in detail. For adult sex xxx webcam needs you may actually want to SOFTEN the focus somewhat to take off your rough edges and smooth your flaws and bumps a bit!
Web cams with an adjustable focus ring imply a bit of fiddling.
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Other, Not-So-Great low-quality webcams are mentioned - Not all webcams are created equal.
Given an adequate lighting setup, they deliver very high quality video and audio on ANY modern computer OS without requiring any additional webcam software.
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More recent cameras with Hardware-Based Autofocus have improved greatly with more responsive and smoother adjustments.