Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good enough.

I bought this adapter as I am using a Nikon R1 macro speedlight (ring) on a Tokina 100mm macro lens. The R1 kit does not come with a 55mm adapter, and I found that this metal adapter is strong enough to work without flexing.By the way, when using any ring light on the Tokina 100mm lens, you must put the lens into manual focus mode or you could burn out the focus motor due to the weight of the flash. This is only an issue with externally focusing lenses such as the Tokina, but in macro you are almost always manually focusing anyway.