Resolution Logitech c 270

I have a c260 logitech webcam but the resolution is not good, the image is out of focus.
What can I do ? There are controls for adjusting focus.
I attach picture

dunno 'bout c260 but for c270 there's no autofocus. there's a ton of parts on thingiverse to add a focus ring to c270, you open the front cover, put instead printed one with ring that goes over the lens .. before that you turn lens forcefully with pliers to "break" the glue holding the lens in fixed focus position