How clear are these type things? I've never seen one in person, but it seems to me that all the photo's you see online are doctored one way or another. Can you clearly tell what you're looking at or do you kind of have to recognize shapes, heat temps (for thermals), etc and guess a lot? For instance... If I see something at 100 yards can I tell it's A.) A short haired German Shepard with a brindle coat or B.) a "dog". Hope that makes sens and sorry if that's a stupid question.