User error mainly to be honest , and at night there just shit for picking up phesants, when it comes to thermal you realy do get what you pay for , I met up with my nephews mate who has the same one and his is exactly the same with phesants at night they would show up faintly with a red dot on the face , my other mate has the hik owl 35 wich he paid 2500 for and its unbelievably better in every way , I stood on the out side of a wood and could see loads phesants roosting and there full body was flowing red like someone ad coloured them in lol , I sold mine as it just wasn't what I was after as