For what it costs if you are not very demanding it may be worth but I bought it thinking that the prism I had was bak4, since the seller assured me that it was Bak-4, but then when I saw the specifications or what it put in the box did not come out bak-4 anywhere. When testing it on the contour part of the circle it looked somewhat blurred and somewhat darkened, typical of the Bak-7 prism, I ended up returning it. It comes with a remote to take photos without touching it so that the image does not move, at long distances the image was distorted but you could see things at 2km even if the image was blurred.