With no fewer than 14 elements arranged in 12 groups and a minimum focus distance of 33.46 in. (85cm), this new lens adopts a complex optical construction. To help reduce chromatic and spherical aberrations, two of those 14 elements are low-dispersion SLD glass types, while a third is an aspherical-shaped lens.
The new model features improved environmental protection over earlier lenses in the lineup. In addition to oleophobic coatings on the front and rear lenses, the lens mount features rubber sealing for protection against dust and moisture, though it’s not certain that the lens has further sealing elsewhere.
As an HSM model, this