Sigma FF Zoom lenses offer constant T-stops (T1.5 at 18–35mm, T2.0 at 50–100mm) with 0.8 mod gears for follow focus systems as a budget-friendly cinema zoom alternative.
Technical Details
The Sigma 18-35mm T1.5 FF achieves a constant aperture of T1.5 across the entire zoom range, weighing 1.73kg with a 114mm filter diameter. The focus ring rotates 270° with a precise minimum focus distance of 0.3m. The 50-100mm T2.0 FF offers a constant T2.0 aperture and an 82mm filter thread at a weight of 1.49kg. All FF Zooms feature standardized 0.8 pitch gears for follow focus systems, internal focusing, and chromatic aberration correction through FLD and SLD glass elements.
History & Development
Sigma introduced the first 18-35mm F1.8 DC HSM Art for DSLR cameras in 2013, before the cinematic FF variant with T-stops followed in 2016. In 2017, Sigma expanded the series with the 50-100mm T2.0 FF. The lenses were developed in response to the growing demand for cost-effective alternatives to established cine zoom manufacturers like Angenieux or Fujinon. In 2019, the more compact 18-50mm T2.0 FF followed for lighter camera setups.
Practical Use in Film
Sigma FF Zooms are used in independent productions and Netflix series due to their price-performance ratio and high optical quality. The 18-35mm is suitable for handheld work in available light thanks to its T1.5 aperture. Documentary filmmakers appreciate the minimal breathing during zoom movements while shooting. The lenses fully cover Super 35mm, but vignette on full-frame sensors above 28mm focal length.
Comparison & Alternatives
Compared to Zeiss Compact Zooms, Sigma FF lenses offer higher light transmission at a third of the cost, but do not achieve their sharpness performance in the edge areas. Canon CN-E Zooms deliver comparable image quality at double the price and with better build quality. For budget productions, the Sigma FF Zooms represent an alternative to more expensive cine zooms, while high-end productions continue to rely on established manufacturers.