Yeah ...
Generally you open up the cam to get to the lens .. ( voids warranty )
The lens is usually glued , some insanely , some mildly ..
So you need to scrape off the glue ...
Generally speaking , turning the lens out , will focus closer , and turning the lens in will focus farther away .
So if you find your cam is focusing well close up , and some what soft at infinity , it might need a little teak inward ( usually clock wise )
Just be careful when opening the cam , its a really good time to stuff it up ( so be warned )
You want plenty of light , and jewelers screw drivers ..