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Standing as a supremely versatile super-wide lens, this unique and intuitive 16-18-21mm f4 Tri-Elmar-M Asph affords three separate focal lengths within one lens. As to the optical design, this centres around ten elements within seven key groups, including dual aspherical elements to limit spherical aberrations. This affords the clean, crisp, and accurate rendering of interior and architectural subjects; something that this lens is heavily praised for. By producing such minimal field curvature and utilising an internal manual focusing design , this Leica 16-18-21mm f4 lens is truly special when it comes to close-quarters shooting. Other key features include one floating element to ensure consistent image-quality throughout the focal range, the acceptance of 67mm threaded filters, and the inclusion of a detachable lens hood. You can essentially switch between 16mm, 18mm, and 21mm focal length positions within seconds; still maintaining a minimum focusing distance of just 50cm.