With the B+W +5 diopter close-up lens, you have reached the most powerful in the B+W close-up lens range. The B+W +5 close-up lens provides seamless continuation from the NL 3 with a 35 mm lens (up to approx. 1 : 3.5). Anyone with a 50 mm lens who can accept a small gap (approx. 1 : 4.4 to 1 : 4) after the NL 2 can continue a bit further into the macro range (up to approx. 1 : 2.6) by using the NL 5 instead of the NL 4.