B + W 77mm +4 Close Up Filter - NL4

Diopters are optical close up lenses that make macro photography easy. •When added to a lens they greatly narrow the depth of field while reducing the minimum focusing distance of your lens. •The effective focal length of the dioptere are: • +1 = 1000mm • +2 = 500mm • +3 = 333mm • +4 = 250mm • +5 = 200mm