That's the problem I have with a thermal scopes at the moment, they have come on leaps and bounds , but feel be a few years before spot on , personally use the xp38 & drone 10x as main foxing outfit , we have had a few experiences were I've had the young keeper spotting , plainly see the fox in thermal , on the drone , all could see overhang& brash or debris , if had a thermal scope would of taken the shot , not knowing of all the crap in front ! On the other hand if on a budget I've got a new007 12mm combined with a good I.r comfortably shoot out to 300yds with a good sight picture, ideal for rabbiting, rats or foxes ...