title_body: How to focus a newly-replaced lens on an FPV camera? I cracked the lens on my FPV camera after a metal pipe jumped in front of my quad...Fortunately, I had another lens from another FPV camera sitting around.  But I'm not sure how far away I should be trying to focus this lens.  Are there any best practices or rules of thumb to follow?
upvoted_answer: I like to set the drone in a window or take it outside.  Then adjust the focus while looking through the goggles until I get it where it looks good to me.
  
  You may also wish to print out a focus test pattern or follow this detailed tutorial on focusing an FPV camera.