Adafruit Lens Adjustment Tool for Raspberry Pi Camera [ADA3518]
This nifty little plastic tool provides you a super simple, super cheap means for adjusting the lens of your Raspberry Pi camera!
Simply place the little hole opening snugly over the camera lens – it should set nicely with no need to force. Then turn like a dial to the left or right and adjust the focus to your heart's content!
For use with the Raspberry Pi 8MP (version 2) cameras only