One point deduction's because the lens-mounted ring light can be turned on the screw-on lens adapter, without there being a possibility of fixing. This means that you first have to make sure a non schlappert the cable through the area (and, for example, shaking on a plant whose flower you want to just take pictures) and 2. that you two hands for light-intensity adjustment (via a small switch on the ring light itself) need, namely to retain and for switching.
But overall for the price a good product. How fast the light empty sucks the four 1.5V batteries I can not say yet.
