Optical formula of new Sigma 85mm T1.5 FF Cine lens
Source: Sigma 85mm T1.5 FF specification sheet
Sigma has published technical specifications of its new cinema lenses announced today, and one point that stands out is an all-new optical formula for the 85mm T1.5 FF lens. While the other T1.5 full frame cine primes clearly use the optics from Sigma’s highly-regarded f/1.4 Art range of DSLR lenses, the 85mm T1.5 has an all-new configuration of 14 elements in 12 groups , as shown above. Compare this to the 11 elements in 8 groups design used by the existing Sigma 85mm f/1.4 EX DG HSM, seen below.
Optical formula of current Sigma 85mm f/1.4 EX DG HSM
With the Photokina trade fair coming up in Cologne in a couple of week’s time, it seems fair to guess that we’ll see a new Sigma 85mm f/1.4 DG HSM Art prime announced there, with the same optical design as the 85mm T1.5 FF cine lens.
Sigma 85mm T1.5 FF cine lens
Like Sigma’s other new T1.5 primes the 85mm has a purpose-designed housing with geared focus and aperture rings featuring highly detailed distance and transmission scales, along with an integrated tripod mount foot with a standard 1/4in thread.
