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B+W's 40.5mm Close-up Lens NL5 Glass Filter is a filter for close-up photography.
With +5 diopters, the NL 5 serves for the seamless extension of the range provided by the NL 3 close-up lens on a 35mm main lens (up to appr. 1:3.5). If you can tolerate a small gap after the NL 2 close-up lens on a 50mm main lens (appr. 1:4.4 to 1:4), then you enter a little further into the macro range with the NL 5 instead of the NL 4 (up to appr. 1:2.6).
Note: B+W close-up filters (diopters) are a single element design.
Each glass surface is vacuum coated with one layer of Anti-Reflection coating. This single layer helps to prevent internal ghosting and reflections. It also improves light transmission from approximately 92% (uncoated glass) to over 98%.
This filter uses B+W's standard B+W F-Pro filter mount, which has a front accessory thread and is made of brass. Compared to the earlier standard mount introduced in 2001, the F-Pro mount has become thinner. Now it can be used with wide angle lenses, including most 24mm focal lengths on a full frame body, without vignetting. Another advantage of the F-Pro mount is it's modified retaining ring, which is no longer threaded in from the front, but holds the filter glass in place from the back. When removing a filter or lens hood that has been screwed on too tight to the filter, the retaining ring is not at risk of loosening.
Note: diopters are mounted in the older mount due to glass thickness.