one of the best Ultra wide len for Full frame 14-24 F2.8 Nikon have a good option to use GND filters (and only for 14-24 for the moment …how I wish they may for 14L too) ….
it comew ith holder ring system, GND .6h , cleaning cloth, soft len cap …. and GND .9s, GND .9h, GND .6s available too …
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look for Lee Filter, SIngh-Ray filters for Landscape
most of my pictures capture with Lee FIlters, SIngh-Ray