Radar can create images just not true to life color photos. But, leak such a photo of a couple in their bedroom with the blinds closed and you have a problem.
If you mean from the inside that’s a question of contrast. Look at a tv in a dark room through one side of a t-shirt a few inches from your face and it’s a non issue. Try the same while the side facing you is well lit and it does not work.
Under some situations you can see through thin cloth blinds like this from the outside, but that’s mostly poor blind choices.
It's actually a blind on my backporch similar to this: https://images-na.ssl-images-amazon.com/images/I/71rijF9vnlL... , but it has tiny gaps in-between each slats... I could see through the blind when I was zoomed in to 300mm while being a meter away from it... I could see my neighbor's house and the slats were invisible in the picture. Kind of creepy but I don't have this camera anymore so I cannot do anymore tests...
