UV F-Pro filter blocks the invisible UV component of light from the sky which often causes blur. UV Filters are ideal for when shooting in high altitudes such as in the mountains, by the sky and in regions with extremely clean air. Blue casts are also avoided with this UV filter. The glass of this UV filter is colourless which doesn’t alter the colour rendition and no increase in exposure is required. This colourless UV filter protects the lens’ element against dust & sand and can be kept on the lens at all times.
The standard filter mount F-Pro can be used on most wide-angle lenses without the danger of vignetting. As a guide this filter mount can be used without vignetting on 35mm camera lenses (approx 63° diagonal angle of view). Also, most wide-angle lenses with 28mm (approx 75° angle of view) and in many cases even with 24mm (approx 84° angle of view) can be combined with the F-Pro mount without the risk of vignetting.
Another advantage of the new F-Pro filter mount is that the glass is no longer held in place from the front, but from the back by the retaining ring. This prevents the retaining ring from being accidentally loosened during the removal of an additional filter or a lens hood which has been screwed in too tightly.