Which camera to choose for mark recognition?

Question

CCTV

Greetings!
In general, it is required to recognize marks (square within a square of 6x6 mm) from a distance of 10 cm.
I tried the Logitech HD Webcam C270 (3mp, HD 720p) camera, but at such a close distance the marks become blurry, accuracy suffers from this extremely.
I would like to know if there is any camera that can focus normally from 10 centimeters?
You can even not a webcam, because. I don't think they're all designed for that close range.

Answer 1

Attach a loupe (a convex magnifying glass with a positive diopter) to the camera. Increasing the optical power of the lens system between the sensor and the subject will reduce the focal length to what you need. In ancient times, without autofocus, I photographed radio components with a telephone like this.
Also, in many cameras, you can rotate the lens, thereby changing its distance to the matrix. This way you can also focus the camera on the object.