B+W +4 Closeup Diopter, 67mm

This +4 diopter is required to help many popular midrange zoom lenses function behind moderately sized dome ports.

In English, this means if you want to use the popular Canon 17-85 EF-S IS lens, or Nikon’s 18-70DX lens behind Ikelite’s dome ports, you need this diopter. For compatibility questions with other ports, please call or email us.