I need to buy a HD camera can take clear pictures within 5-10 cm?
Hello @NailRobot and welcome to the forum!
I suggest you check out the Cameras & Vision Sensors section here in RobotShop. Especially the adjustable focus camera modules, like these:
I’ve also read that some people hack the fixed-focus Rpi camera modules to be able to adjust the focus, you can read more about this in the following links:
https://elinux.org/Rpi_Camera_Module#Adjusting_Lens_Focus
https://www.raspberrypi.org/forums/viewtopic.php?t=60828#p453312
https://www.raspberrypi.org/forums/viewtopic.php?t=46637
I hope that information can help you out 