Digital camera CCD or CMOS sensors are highly susceptible to reflections. HOYA PRO-1 DIGITAL filters have been designed to ease the problem. They are specially multicoated to reduce lens flare and ghosting. They are supplied in an ultra thin filter mount to help avoid vignetting on super wide angle lenses, and are also designed to hold a lens cap. The  mounts are in a black satin almite finish also designed to eliminate reflections. The mounts are edge knurled for non-slip attachment and removal. Finally, each filter glass is black rimmed to reduce the chance of light reflecting off the edge.

CU+3 uts the infinity position of any lens at 33cm. Small apertures should be used to maximise depth of field.