Hi All, 
  
I'm new here so firstly Hello!! 
  
I'm looking for a bit of advice really, I'm looking to setup some home CCTV (obviously?) where the DVR will be in my house and a CCTV camera will be roughly 30 Meters away on a shed. 
  
I've attached a picture to try and provide a little clarity (terrible picture sorry). 
  
I'd like a camera on shed 2 but electric doesn't run that far down and before I expend the power (digging) I'd like to check this sound correct.  I'll run BNC cable from the DVR in the house (will be kept in a bedroom) to the camera on shed 2 and then power extended underground to the camera. 
  
Then two more camera at the top which should be a little easier to wire but my questions are: 
Does BNC have a max length? 
Is this the easiest method? 
Any other recommendations to a noob? 
  
Thanks