Is the SIGMA 28-45mm Concept the Future of Cinema Lenses?

Sigma’s 28-45mm T2 autofocus cine lens raises important questions about the future of cinema lenses, particularly in a world where traditional, manual-control zoom lenses have been the gold standard for decades. The introduction of autofocus in cinema lenses challenges a long-held belief: that manual control by a skilled focus puller is irreplaceable, especially in high-end narrative filmmaking.

While autofocus can offer precision and speed in certain situations, it lacks the subtlety and creative control provided by a human touch. Skilled focus pullers work alongside directors and cinematographers to achieve focus that complements the emotional tone and rhythm of a scene. Autofocus systems, by contrast, tend to feel mechanical and can even disrupt a scene with focus hunting. As cinema continues to embrace new technology, the question is whether these trade-offs will be accepted by filmmakers, or if manual control will remain a vital aspect of the craft.

The Rise of Hybrid Lenses

Sigma’s new lens is part of a broader trend toward hybrid lenses—tools that blend the features of traditional cinema optics with advanced motorized systems for zoom, focus, and iris control. Examples of this trend include Fujinon’s Cabrio and Canon’s Cine-Servo zooms. These lenses offer both full manual control as well as motorized options, giving filmmakers the flexibility to choose the right approach for their production. While useful for fast-paced, high-efficiency shooting environments like broadcast or live events, these lenses have gained mixed acceptance in cinema, where the human element remains crucial for precise artistic expression.

Additionally, lenses like Canon’s Compact-Servo and Sony’s Power Zoom series push the hybrid model further by integrating features typically found in photo or video lenses, such as autofocus and motorized zoom. Despite offering convenience, these lenses have not been widely adopted in cinema, where the demand for precise manual control and high optical standards remains strong.

The Pros and Cons of Automation

The shift toward more automated lenses like Sigma’s 28-45mm T2 presents both opportunities and challenges. On one hand, the inclusion of autofocus, motorized zoom, and iris control can streamline workflows, especially for solo operators or small crews. These features allow filmmakers to capture moments more efficiently, particularly in unpredictable shooting environments like documentaries or live events. The ability to quickly reframe or adjust exposure without physically manipulating the lens can save valuable time.

However, for narrative filmmaking, the loss of manual control may be seen as too high a price to pay. Autofocus, while improving, still lacks the instinctive, nuanced adjustments that an experienced focus puller provides. Moreover, reliance on in-camera aberration correction raises concerns for traditionalists who prefer open systems where lenses can be freely paired with various camera bodies and setups. Closed ecosystems, which depend on specific camera-lens combinations to correct optical imperfections digitally, are often viewed with skepticism by cinema professionals who value flexibility and control.

Focus-by-Wire Systems

A potential aspect of Sigma’s new lens that remains unconfirmed but likely, based on industry trends, is the use of a focus-by-wire system. In this system, although the focus ring can be manually turned by the operator, it does not directly control the movement of the focus elements. Instead, turning the ring sends electronic signals to motors that make the actual adjustments. This creates a degree of detachment between the physical, human action and the mechanical outcome.

While focus-by-wire systems are increasingly common in modern lenses, they bring both benefits and drawbacks. On one hand, they allow for smoother, more consistent control over focus, particularly when paired with autofocus. However, traditionalists often feel a sense of disconnection from the optics themselves, as the tactile feedback and precision of manual focus are lost. For cinematographers who are used to feeling the exact moment when focus locks in, this system can feel less intuitive, creating a barrier between operator and lens.

If Sigma’s 28-45mm does employ a focus-by-wire system, it would further blur the line between cinema and photo lenses, as many hybrid lenses now use this technology. While it may appeal to smaller crews or filmmakers who value speed and convenience, it could reinforce the perception that such lenses are not designed for high-end narrative work. The absence of true manual focus would be a sticking point for professionals who need the precision and responsiveness that only a fully manual lens can offer.

A Potential Shift in Cinema Lens Design?

As the industry evolves, lenses like the Sigma 28-45mm T2 hint at a broader shift in cinema lens design—one that moves toward greater automation, but also greater convenience and versatility. The growing popularity of full-frame sensors and the need for fast, efficient workflows are driving manufacturers to innovate. Sigma’s decision to focus on full-frame mirrorless cameras reflects these trends, as does their hybrid approach to lens design. Yet, the question remains whether these lenses can ever fully replace traditional cinema zooms in the hearts and hands of filmmakers.

While hybrid lenses are unlikely to replace full manual lenses in high-end productions anytime soon, their presence signals a change in what filmmakers expect from their tools. These lenses are reshaping the lower end of the market, making professional-quality optics more accessible to independent filmmakers and small production teams. For now, traditional cinema lenses—with their tactile control and unmatched precision—remain the standard for serious filmmaking, but as technology continues to evolve, the gap between automation and artistry may begin to close.

In conclusion, Sigma’s 28-45mm T2 represents both an exciting development and a potential pivot point for the industry. As hybrid lenses continue to evolve, filmmakers will face more choices between the speed and convenience of automation and the artistry and control of manual cinema lenses. Whether cinema lenses gravitate toward automation or uphold the legacy of manual precision is still up for debate, but one thing is certain: Sigma, as a trailblazer in the realm of optical engineering, will continue to deliver cutting-edge, high-quality lenses that define and shape the industry’s next era.