Ummm, yes, it surely is FX-capable! It's pretty sweet on Nikon 24-MP FX, and pretty good on the Canon 5D Classic when used with the Fotodiox G-series adapter, which gives you basically, seven user-settable, click-stopped aperture values. On a moderate-MP pixel count sensor, like the 12.8 MP full-frame of the 5D classic, the lens gives a great image.