The 85mm is the longest focal length in most standard prime-lens sets. Although it is not the longest focal-length available in the S35 range it’s an important lens of the Illumina S35 high-speed series. The complete series consists of a total of 7 focal-lengths ranging from a 14mm up-to a 135mm. Most lenses have a T1.3 aperture except for the 135mm that has got a T1.8 aperture and the 14mm that has got a T1.8. The lenses are available with either a feet- or a meter focus-scale.