Samyang T1.5 VDSLR 24mm

The Samyang 24mm T1.5 VDSLR AS IF UMC II in the Cine Ecosystem

The Samyang 24mm T1.5 VDSLR AS IF UMC II is a wide-angle prime lens designed specifically for cinematography and video production. It occupies a critical position in the Samyang VDSLR II lineup, serving as the standard wide-angle option for full-frame sensors. While many wide-angle lenses are designed for still photography and later adapted for video, this lens was engineered with a video-first workflow in mind. The optical formula consists of 13 elements arranged in 12 groups, a complex arrangement necessitated by the requirement to maintain a fast T1.5 aperture while correcting for the distortions inherent in a 24mm focal length. On a full-frame sensor, it provides an 84.1-degree diagonal angle of view, making it a primary choice for establishing shots, architectural interiors, and environmental portraiture where the subject needs to be contextualized within their surroundings.

The "AS IF" designation in the name refers to the inclusion of Aspherical (AS) elements and an Internal Focus (IF) mechanism. The internal focus design ensures that the physical length of the lens remains constant at 97.1mm (in the Canon EF mount version) regardless of the focus distance. This is a vital feature for filmmakers using matte boxes or rail-mounted follow-focus systems, as the front element does not extend or rotate, preventing interference with filters or gear alignment. The lens is part of a color-matched set, meaning that if a production swaps between the 24mm, 35mm, 50mm, and 85mm lenses in this series, the color rendition and contrast remain consistent, significantly reducing the time required for primary color correction in post-production.

Optical Construction and Light Transmission

The defining characteristic of the Samyang 24mm T1.5 is its light-gathering capability. Unlike "f-stops" which are theoretical mathematical ratios, the "T-stop" (Transmission stop) rating of T1.5 accounts for actual light loss through the glass elements. This ensures that exposure remains consistent when switching between different lenses in a cine set. To achieve this brightness without sacrificing image integrity, the lens incorporates four Extra-low Dispersion (ED) glass elements. these elements are specifically designed to minimize chromatic aberration—the "purple fringing" often seen at the edges of high-contrast objects when shooting wide open. By focusing different wavelengths of light more precisely onto the sensor plane, the ED glass maintains edge-to-edge sharpness that is often lost in budget wide-angle glass.

Furthermore, two aspherical elements are utilized to combat spherical aberration and geometric distortion. At 24mm, straight lines at the edges of the frame have a tendency to bow outward (barrel distortion); the aspherical surfaces correct this light path to ensure that architectural lines remain rectilinear. The glass surfaces are treated with Samyang’s Ultra Multi-Coating (UMC). This coating is engineered to maximize light transmission while suppressing internal reflections. In practice, this results in a lens that handles "veiling glare" effectively, maintaining high contrast even when a light source is positioned just outside the frame or directly within it. The 8-blade aperture diaphragm produces a rounded opening, which translates to smooth, circular bokeh highlights when the lens is stopped down slightly, avoiding the jagged polygonal shapes found in lenses with fewer blades.

Mechanical Handling and Build for Cinema

The physical interface of the Samyang 24mm T1.5 is built for manual precision. Both the focus and aperture rings feature industry-standard 0.8 MOD gearing. This allows for immediate integration with follow-focus units, whether they are mechanical hand-wheels or wireless motors. The aperture ring is "de-clicked," meaning it rotates smoothly without the tactile stops found on photography lenses. This allows a cinematographer to perform "iris pulls"—smoothly adjusting the exposure mid-shot as a subject moves from a brightly lit area into shadow—without any audible clicks or jarring jumps in exposure levels. The focus throw is approximately 140 degrees, providing a balance between speed and precision. This expanded rotation compared to still lenses allows a focus puller to make minute adjustments, which is essential when shooting at T1.5 where the depth of field is exceptionally shallow.

The lens barrel is constructed from high-strength aluminum alloy, providing a robust feel while keeping the weight manageable at approximately 590g to 640g depending on the mount. The focus and aperture scales are marked on both sides of the lens barrel. This dual-scale design is a standard cinema requirement, allowing a camera assistant or focus puller to read the distances and T-stops from either the left or right side of the camera body. The front of the lens features a 77mm filter thread, a common size that allows for the use of standard circular polarizers or ND filters when a matte box is not being utilized. The minimum focusing distance is 0.25 meters (9.8 inches), allowing for close-up shots that emphasize the foreground while still capturing a vast background.

Video Performance and Cinematic Characteristics

When evaluating the Samyang 24mm T1.5 for video, the primary consideration is its rendering of the "cinematic look." At T1.5, the lens produces a significant amount of background separation, which is rare for a wide-angle focal length. This allows filmmakers to isolate a subject in a medium shot while still showing the environment. The lens exhibits a moderate amount of focus breathing—a slight change in the effective focal length when racking focus from the minimum distance to infinity. While present, it is controlled well enough for most narrative applications. The lens is designed to cover a full-frame 35mm sensor (36x24mm), making it compatible with high-resolution sensors like those found in the Sony A7S III, Canon EOS R5, or RED V-RAPTOR. When used on Super 35 or APS-C sensors, the effective focal length becomes approximately 36mm, shifting its utility from a wide-angle to a "natural" or "storytelling" prime.

The rendering of the lens is often described as "organic." It lacks the clinical, ultra-sharp digital edge of modern high-end cinema glass, which many filmmakers find desirable for skin tones. At T1.5, there is a slight softness and a gentle "glow" to highlights, which can be used artistically to create a dreamlike or vintage aesthetic. By stopping down to T2.8 or T4.0, the lens sharpens significantly across the entire frame, making it suitable for high-detail landscape or commercial work. The 24mm focal length is also wide enough to be used on stabilized gimbals without the micro-jitters often associated with longer lenses, yet it is long enough to avoid the "fisheye" distortion that can make professional footage look amateurish.

On the Shoot: Real-World Scenarios

In a wedding reception scenario in a dimly lit banquet hall in Bengaluru, the Samyang 24mm T1.5 becomes a vital tool. Wedding cinematographers often face environments where additional lighting is restricted or impractical. The T1.5 aperture allows the sensor to pull in enough ambient light to maintain a clean image at lower ISO settings, preserving detail in the shadows of the decor. The 24mm width is ideal for capturing the scale of the "mandap" or the energy of the dance floor, allowing the operator to stay close to the action while still framing multiple people. The manual focus ring allows for smooth transitions between the couple in the foreground and the guests in the background, a technique that adds a professional narrative layer to wedding films.

For a travel documentary shoot in the coastal regions of Goa, the lens excels in capturing environmental context. When shooting inside a narrow Portuguese-style villa or a crowded spice market, the 24mm focal length provides the necessary field of view to show the architecture and the atmosphere without the need to step back into walls. The 0.25m close-focus capability allows the filmmaker to get tight shots of local crafts or food, with the wide aperture creating a soft blur that prevents the busy background from distracting the viewer. The robust metal build is also an advantage in humid coastal environments, though the lack of electronic weather sealing means the operator must use a rain cover in monsoon conditions.

In a Mumbai-based studio setting for a product commercial, the lens is often used for "lifestyle" context shots. If the product is a piece of furniture or a large appliance, the 24mm focal length allows the camera to capture the item within a stylized room set. Because the lens is rectilinear, the straight lines of the studio walls and the product itself remain true, which is essential for high-end commercial aesthetics. The de-clicked aperture is particularly useful here; if the lighting setup involves a window with changing natural light, the cinematographer can subtly adjust the T-stop during a take to maintain a perfectly consistent exposure on the product without the viewer noticing the adjustment.

Compatibility and Pairing

The Samyang 24mm T1.5 is available in multiple mounts, including Canon EF, Nikon F, Sony E, and Micro Four Thirds. For users of mirrorless systems like the Sony FX3 or Canon C70, the EF mount version is frequently paired with a focal reducer (Speed Booster) or a standard smart adapter. When used with a 0.71x focal reducer on an APS-C sensor, the lens effectively returns to its full-frame field of view and gains an extra stop of light, reaching an effective T1.1. This makes it one of the fastest wide-angle options available for crop-sensor cinema cameras.

In terms of accessories, the 77mm front diameter is compatible with standard matte boxes like the Tilta Mirage or SmallRig lightweight models. For power and media, the lens is purely mechanical and requires no battery power from the camera, nor does it communicate EXIF data. This means the filmmaker must manually log the focal length and aperture settings if that information is needed for VFX or post-production. It pairs perfectly with other lenses in the Samyang VDSLR II series, specifically the 35mm T1.5 and 85mm T1.5, as they share the same gear positions. This allows for rapid lens changes on a rigged camera, as the follow-focus motor does not need to be repositioned on the rails when swapping between these specific focal lengths.

Limitations and Alternative Considerations

While the Samyang 24mm T1.5 is a versatile workhorse, it has specific limitations that may lead a filmmaker to choose a different tool. The most significant factor is the lack of autofocus. For solo operators using gimbals with advanced tracking features, such as the DJI RS3 Pro with LiDAR, the manual-only nature of this lens requires the addition of an external focus motor. If the shoot requires fast-paced, "run-and-gun" style tracking of moving subjects where a dedicated focus puller is not available, a native autofocus lens like the Sony FE 24mm f/1.4 GM or the Canon RF 24mm f/1.8 would be more appropriate, though these lack the geared rings and de-clicked iris of the Samyang.

Optically, the lens is not as sharp at T1.5 as more expensive cinema primes like the Zeiss CP.3 or the Sigma Cine series. There is a noticeable "softness" at the maximum aperture, and some longitudinal chromatic aberration (color fringing in the bokeh) can occur in high-contrast scenes. If a project demands absolute clinical sharpness for 8K delivery or heavy green-screen work, stopping the lens down to T4.0 is necessary, or one might consider a higher-end prime. Additionally, the lens does not have internal stabilization. While this is standard for cinema glass, users shooting handheld on cameras without In-Body Image Stabilization (IBIS) will find the footage difficult to use without a tripod or gimbal. Finally, the lack of electronic contacts means no aperture or focal length data is recorded in the video metadata, which can complicate the workflow for productions requiring detailed camera logs for CGI integration.