I got my sightmark wraith and can't see shit with the thing. Did I get a bad unit or just not adjusting something. I can see about 15 ft in my basement is about it. Green is useless. I turn on the ir and and scope. Have it adjusted down to 4x and have played with the focus ring in the front with no luck. Yes, the front lens cap is off. Are there other adjustments I need to make? Only a quick start up guide came with it.