Got pros: Aperture + stub = even on an open aperture, to Nikkor 24-120/4 VR) Sharpness starting at 2.8, Has some cons: Rather nit-picking (requires verification). 1 hares in the backlight from multipoint bright sources (lanterns in the center of Hong Kong). 2 - creates a shadow. 3 on almost all focal lengths. 4 D750).