Sigma 20mm T1.5 FF High-Speed Prime Lens

Sigma 20mm T1.5 FF High-Speed Prime Full-Frame Cinema Lens | T1.5 Aperture, 6K–8K Resolution, PL / EF / E Mount Compatibility

The Sigma 20mm T1.5 FF High-Speed Prime is pure cinematic freedom—wide, fast, and uncompromising—and it exists for filmmakers who want to buy a lens that delivers theatrical impact without theatrical prices. Built for full-frame cinema cameras and engineered to resolve 6K–8K class imagery, this 20mm prime combines a dramatic wide-angle perspective with an exceptionally bright T1.5 aperture, giving you creative control in low light while maintaining stunning subject separation that is rarely achievable at this focal length. At its core is a sophisticated optical design featuring 15 elements in 11 groups, including FLD, SLD, and precision-molded aspherical elements, which work together to produce edge-to-edge sharpness, minimal distortion, controlled chromatic aberration, and a clean, cinematic image that holds up under heavy color grading.

The rounded 9-blade diaphragm delivers smooth, organic bokeh, while Sigma’s advanced flare and ghosting suppression ensures high contrast and rich blacks even when shooting directly into light sources—an essential advantage for narrative, commercial, and documentary cinematography. Designed with professionals in mind, this lens covers a φ43.3mm full-frame image circle with an illumination circle exceeding 46.3mm, making it ideal for modern large-format sensors and future-proof productions. Precision mechanics elevate the shooting experience: a 180-degree focus rotation enables accurate focus pulls, a clickless 60-degree iris rotation allows seamless exposure transitions, and industry-standard 0.8 MOD cine gears integrate effortlessly with follow-focus systems.

The lens maintains a 95mm front diameter for matte box compatibility and includes a dedicated support foot to reduce mount stress on professional rigs. With a close-focus distance of approximately 0.28 meters and a 1:7.1 magnification ratio, the Sigma 20mm T1.5 excels at immersive wide shots, environmental portraits, handheld gimbal work, and dynamic camera movement. Available in PL mount with Cooke /i Technology compatibility, Canon EF, and Sony E-mount, it offers electronic communication for metadata capture and system integration, while Sigma’s mount conversion service adds long-term flexibility. Rugged, dust- and splash-resistant construction with laser-engraved, tape-safe markings ensures reliability on demanding sets, whether you’re shooting commercials, feature films, or high-end branded content. 

Compared to competing cinema primes, this lens delivers premium optical performance, consistent color matching across Sigma’s FF High-Speed Prime line, and true cinema ergonomics at a far more accessible price point—making it a smart, profit-driven investment for owner-operators and rental houses alike. If you’re ready to buy a professional cinema lens that blends speed, resolution, durability, and cinematic character into one powerful tool, the Sigma 20mm T1.5 FF High-Speed Prime is the wide-angle workhorse your production deserves—order now and elevate your visuals immediately.

Product Benefits:

• Capture more light, more mood, more control – the ultra-fast T1.5 aperture lets you shoot in low light with confidence while achieving cinematic depth of field that elevates storytelling and production value.
• Create true cinema-grade images that hold up in post – engineered for 6K–8K resolution, the lens delivers exceptional sharpness, contrast, and color fidelity that withstands heavy color grading.
• Command the frame with immersive wide-angle storytelling – the 20mm full-frame perspective adds scale, drama, and spatial depth without distracting distortion.
• Achieve consistent results across professional shoots – standardized color rendering and matched mechanics ensure seamless integration with other Sigma FF High-Speed Primes.
• Focus with precision under pressure – a 180° focus throw allows accurate, repeatable focus pulls, even during complex camera movement.
• Control exposure smoothly in-shot – the clickless iris ring enables silent, fluid aperture adjustments for professional exposure pulls.
• Protect image quality in challenging lighting – advanced flare and ghosting suppression preserves contrast and detail when shooting into bright light sources.
• Deliver cinematic bokeh that enhances subject separation – the rounded 9-blade diaphragm produces smooth, natural out-of-focus rendering.
• Future-proof your investment – full-frame coverage with an oversized illumination circle supports modern large-format sensors and upcoming camera systems.
• Build faster, shoot longer, rig with confidence – durable metal construction, dust- and splash-resistant sealing, and a 95mm cine-standard front streamline professional workflows.
• Integrate effortlessly into pro cinema systems – available in PL, Canon EF, and Sony E mounts, with Cooke /i compatibility for metadata capture on PL versions.
• Get premium cinema performance without premium cinema pricing – a high-value choice for filmmakers who want top-tier optics with a faster return on investment.

Features:

Ultra-Fast T1.5 Aperture for Maximum Light Control and Cinematic Depth

The Sigma 20mm T1.5 FF High-Speed Prime stands out immediately with its constant T1.5 aperture, giving filmmakers exceptional low-light performance without sacrificing image quality. This ultra-fast transmission allows you to shoot in challenging lighting environments—night scenes, interiors, practical-lit sets—while keeping ISO noise low and dynamic range intact. At a wide 20mm focal length, achieving shallow depth of field is notoriously difficult, yet this lens makes it possible, enabling dramatic subject separation while preserving environmental context. The result is a cinematic look that feels immersive, intentional, and emotionally engaging, giving productions a premium visual signature that audiences subconsciously associate with high-end cinema.

Full-Frame Coverage with Oversized Illumination for Future-Proof Productions

Designed specifically for modern cinema cameras, this lens delivers true full-frame coverage with a φ43.3mm image circle and an illumination circle exceeding 46.3mm. This oversized coverage ensures consistent brightness across the frame, eliminates vignetting on large sensors, and provides compatibility with current and next-generation camera systems. Whether you’re shooting on full-frame, large-format, or planning for future sensor upgrades, this lens protects your investment by staying relevant as camera technology evolves—an essential advantage for owner-operators and rental houses alike.

6K–8K Class Optical Performance Built for High-Resolution Cinema

At the heart of the Sigma 20mm T1.5 is a sophisticated optical formula featuring 15 elements in 11 groups, including FLD, SLD, and precision aspherical elements. This design delivers edge-to-edge sharpness, controlled distortion, and minimized chromatic aberration, even at wide apertures. The lens is engineered to resolve 6K–8K class imagery, ensuring fine textures, clean lines, and consistent performance across the entire frame. This level of resolution is critical for productions that demand flexibility in post-production, including cropping, stabilization, and heavy color grading without image degradation.

Cinematic Bokeh and Natural Rendering with a Rounded 9-Blade Diaphragm

The lens features a rounded 9-blade diaphragm, producing smooth, organic bokeh that enhances subject isolation without harsh transitions or mechanical artifacts. Out-of-focus highlights remain soft and circular, contributing to a more natural, cinematic image aesthetic. This characteristic is especially valuable for narrative films, commercials, and branded content where visual polish and emotional tone matter as much as technical accuracy.

Advanced Flare and Ghosting Control for High-Contrast Scenes

Sigma’s advanced optical design process incorporates extensive ray tracing and real-world testing to minimize flare and ghosting. This ensures high contrast, deep blacks, and controlled highlights, even when shooting directly into strong light sources. For filmmakers working with practical lights, backlit scenes, or stylized lighting setups, this means greater creative freedom and fewer compromises on image integrity.

Precision Manual Focus with Long Throw for Professional Focus Pulling

Built for serious cinema work, the Sigma 20mm T1.5 offers a 180-degree focus rotation, providing the fine control required for precise, repeatable focus pulls. The optimized focus cam allows smoother transitions and more intuitive control across the focus range, especially at longer distances. This precision is critical for narrative filmmaking, live-action blocking, and complex camera movement where accuracy can make or break a shot.

Clickless Iris with Linear Response for Seamless Exposure Changes

The fully manual, clickless iris ring features a 60-degree rotation with linear response, ensuring that each degree of rotation corresponds consistently to exposure changes. This allows cinematographers to perform smooth, invisible aperture pulls during takes without jumps or inconsistencies. Exposure transitions feel natural and controlled, preserving immersion and professionalism in every shot.

Industry-Standard Cine Mechanics for Seamless Rig Integration

With 0.8 MOD gear pitch on both focus and iris rings, this lens integrates effortlessly with follow focus systems, wireless motors, and professional cinema rigs. Gear positions are standardized across Sigma’s FF High-Speed Prime lineup, minimizing re-rigging time when swapping lenses. This consistency saves valuable production time and reduces operational friction on set.

Professional Mount Options with Metadata Support

Available in PL mount with Cooke /i Technology compatibility, as well as Canon EF and Sony E mounts, the Sigma 20mm T1.5 adapts to a wide range of professional cinema and mirrorless systems. The PL version outputs lens metadata—such as focus distance and aperture—to compatible cameras, streamlining VFX workflows and post-production processes. Sigma’s mount conversion service between EF and E further enhances long-term flexibility.

Robust Cinema Build Designed for Real-World Production Environments

The lens features a full metal housing with dust- and splash-resistant construction, making it reliable in demanding shooting conditions. Laser-engraved markings are durable, tape-safe, and designed for long-term professional use. A 95mm front diameter ensures compatibility with standard matte boxes, while the included lens support foot reduces stress on camera mounts, improving balance and system stability during extended shoots.

High-End Cinema Performance Without High-End Cinema Pricing

One of the most compelling selling points of the Sigma 20mm T1.5 FF High-Speed Prime is its ability to deliver premium cinema optics, mechanics, and reliability at a significantly more accessible price point than traditional cinema lenses. This makes it an exceptional value for independent filmmakers, production companies, and rental houses looking to maximize return on investment without compromising on image quality or professional standards.

• Narrative filmmaking – ideal for feature films, short films, and scripted series where a wide cinematic field of view and shallow depth of field are essential for immersive storytelling.
• Commercial and advertising production – delivers high-impact visuals, clean edge-to-edge sharpness, and controlled distortion for polished brand content and product-focused scenes.
• High-end documentary cinematography – the fast T1.5 aperture enables reliable low-light shooting while maintaining natural environments and authentic visual tone.
• Music videos – perfect for dynamic camera movement, stylized lighting, and dramatic wide-angle compositions with cinematic subject separation.
• Corporate and branded video content – produces premium image quality that elevates interviews, environment shots, and storytelling-driven brand narratives.
• Gimbal and stabilizer setups – the 20mm focal length offers excellent balance and perspective for smooth motion shots and fluid tracking sequences.
• Handheld cinema shooting – wide field of view reduces micro-jitters while maintaining professional cinematic depth and clarity.
• Virtual production and VFX workflows – full-frame coverage and Cooke /i metadata support (PL mount) streamline compositing, tracking, and post-production alignment.
• Low-light and night shooting – excels in available-light scenarios such as interiors, cityscapes, and practical-lit scenes without sacrificing image quality.
• Environmental portraits and wide close-ups – allows subjects to remain dominant in the frame while preserving spatial context and visual depth.
• Rental house inventory – a high-demand focal length with durable construction, standardized cine mechanics, and strong cross-camera compatibility.
• Large-format and future-ready productions – oversized illumination circle ensures compatibility with modern full-frame and next-generation cinema sensors.

Pros

• T1.5 ultra-fast aperture delivers excellent low-light performance and cinematic depth of field.
• Full-frame coverage with oversized illumination circle supports modern and future large-format sensors.
• 6K–8K class optical resolution ensures high sharpness and strong post-production flexibility.
• Professional cine mechanics with 0.8 MOD gearing and a long 180° focus throw enable precise control.
• Clickless manual iris allows smooth, silent exposure changes during takes.
• Robust all-metal construction with dust- and splash-resistant sealing is built for demanding production environments.
• Consistent color rendering and standardized gear positions across Sigma FF High-Speed Prime lenses ensure seamless lens changes.
• Multiple mount options including PL, Canon EF, and Sony E with Cooke /i metadata support on PL versions.
• Competitive cinema pricing offers exceptional value compared to traditional high-end cinema primes.

Cons

• No front filter thread requires the use of matte box solutions for filtration.
• Heavier than still-photo lenses which may impact lightweight handheld or compact rig setups.
• Fully manual operation may not suit users who rely on autofocus functionality.
• PL mount limitations prevent conversion to other mounts.

• Product Name: Sigma 20mm T1.5 FF High-Speed Prime
• Lens Type: Full-frame cinema prime lens
• Series: Sigma FF High-Speed Prime Line
• Focal Length: 20mm
• Maximum Aperture: T1.5
• Minimum Aperture: T16
• Optical Construction: 15 elements in 11 groups
• Special Optical Elements: FLD glass, SLD glass, aspherical elements
• Diaphragm Blades: 9 (rounded)
• Close Focus Distance: 0.276 m / 11 in
• Maximum Magnification: 1:7.1
• Image Circle: Full Frame φ43.3 mm
• Illumination Circle: Over 46.3 mm
• Angle of View (Full Frame): 84.0° (horizontal)
• Angle of View (Super 35): 63.2° (horizontal)
• Angle of View (APS-C): 61.3° (horizontal)
• Focus Method: Manual focus
• Focus Ring Rotation: 180°
• Iris Control: Manual, clickless
• Iris Ring Rotation: 60°
• Gear Pitch: 0.8 MOD (focus and iris)
• Front Diameter: 95 mm
• Filter Thread: None (not compatible with front filters)
• Mount Options: PL mount, Canon EF mount, Sony E mount
• Cooke /i Technology: Supported on PL mount versions
• Electronic Communication: Yes (mount dependent)
• Mount Conversion Service: Available between Canon EF and Sony E (PL excluded)
• Construction: All-metal cinema housing
• Weather Sealing: Dust- and splash-resistant structure
• Front-to-Flange Length (PL Mount): 110 mm
• Front-to-Flange Length (Canon EF): 118 mm
• Front-to-Flange Length (Sony E): 144 mm
• Weight (PL Mount): 1,235 g (without support foot)
• Weight (Canon EF): 1,330 g (without support foot)
• Weight (Sony E): 1,380 g (without support foot)
• Lens Markings: Laser-engraved, tape-safe
• Focus Scale Options: Feet or meters (factory selectable)
• Standardization: Matched color and gear positions across FF High-Speed Prime line
• Included Accessories: Cine front cap, rear cap, dedicated lens support foot
• Designed Resolution: 6K–8K class cinema capture
• Intended Use: Professional cinema and video production

• Cine front lens cap
• Rear lens cap
• Dedicated lens support foot

Is the Sigma 20mm T1.5 FF High-Speed Prime compatible with full-frame cinema cameras?

Yes, the Sigma 20mm T1.5 FF High-Speed Prime is designed specifically for full-frame cinema cameras and provides a φ43.3mm image circle with an illumination circle exceeding 46.3mm, ensuring full coverage without vignetting on modern large-format sensors.

Can this lens be used for 6K and 8K video production?

Absolutely. The lens is engineered to resolve 6K–8K class imagery, delivering high contrast, edge-to-edge sharpness, and fine detail that holds up under heavy color grading and post-production workflows.

Does the lens support Cooke /i Technology?

Yes, the PL mount version of the Sigma 20mm T1.5 FF High-Speed Prime is compatible with Cooke /i Technology, allowing lens metadata such as focus distance and aperture to be transmitted to supported cinema cameras.

Is the aperture clickless for smooth exposure changes?

Yes, the lens features a fully manual, clickless iris with a 60-degree rotation, enabling smooth and silent exposure adjustments during filming without visible jumps.

What mounts are available for this lens?

The lens is available in PL, Canon EF, and Sony E mounts, making it compatible with a wide range of professional cinema and mirrorless camera systems.

Can the mount be changed after purchase?

Sigma offers a mount conversion service between Canon EF and Sony E mounts for added flexibility; however, PL mount versions cannot be converted.

Is this lens suitable for low-light shooting?

Yes, the ultra-fast T1.5 aperture allows filmmakers to shoot in low-light environments while maintaining clean images, controlled noise levels, and cinematic depth of field.

Does the lens accept front filters?

No, the Sigma 20mm T1.5 FF High-Speed Prime does not support front-mounted screw-in filters; however, its 95mm front diameter is fully compatible with standard matte boxes.

How precise is the manual focus control?

The lens features a 180-degree focus rotation with industry-standard 0.8 MOD gearing, providing precise, repeatable focus pulls suitable for professional cinema workflows.

Is the lens built for professional production environments?

Yes, it features a robust all-metal construction with dust- and splash-resistant sealing, laser-engraved markings, and an included lens support foot for stability during extended shoots.

Is the lens color-matched with other Sigma cinema primes?

Yes, the Sigma 20mm T1.5 is color-matched to Sigma’s FF High-Speed Prime lineup, ensuring consistent color rendering when switching lenses on set.