One of the shortcomings of such a wide-angle lens is the ability to add traditional filters to them. The protruding front lens elements and fixed petal-shaped hoods make it impossible.
Fotodiox has solved this problem with its new WonderPana FreeArc filter system for the Nikon wide- and super-wide lenses. The FreeArc can also handle graduated ND filters with the square filter attachment.
Check out the promo video below for a rundown on how the system works. [Read more...]