ART
135 mm F1.4 DG
Dg os
135mm F1.4
DG
- The world’s first AF 135mm F1.4
- Large bokeh for powerful visual expression
- Precision optics for exquisite portrait detail
- Fast, accurate autofocus to capture fleeting expressions
- A wealth of functions for professional use and excellent build quality
REVOLUTIONIZING PORTRAITS WITH THE WORLD'S FIRST*1 AF 135MM F1.4
| Angle of view | Telephoto | |
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| Camera Type | Mirrorless | |
| Lens Mount | L-Mount, Sony E-mount | |
| Sensor Size | Full Frame | |
| Construction | 17 elements in 13 groups (4 FLD and 2 aspherical lens elements) | |
| Angle of view | 18.2° | |
| Number of diaphragm blades | 13 | |
| Minimum aperture | F16 | |
| Minimum focusing distance | 110cm | |
| Maximum magnification ratio | 1:6.9 | |
| Filter diameter | φ105mm | |
| Dimensions (diameter x length) | Sony E-mount ⌀ 111.7mm x 137.5mm |
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| Weight (g) | Sony E-mount 1 420g |
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| Edition number | S025 | |
| Supplied Accessories | POUCH, LENS HOOD LH1126-01, FRONT CAP LCF-105 IV, REAR CAP LCR III, SHOULDER STRAP, TRIPOD SOCKET TS-181, PROTECTIVE COVER PT-61 | |
| EAN | Sony E-mount 085126241650 |
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| Specifications Info | * This product is developed, manufactured and sold based on the specifications of E-mount which was disclosed by Sony Corporation under the license agreement with Sony Corporation. |
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Unmatched large bokeh opens up new expressive possibilities
The most notable feature of the Sigma 135mm F1.4 DG | Art is its extremely large bokeh. The effective aperture diameter*¹ of the 135mm F1.4 lens produces exceptional bokeh, which is larger than that of the Sigma 105mm F1.4 DG HSM | Art known as “Bokeh Master,” and is comparable to that of the Sigma 200mm F2 DG OS | Sports.
The natural perspective unique to 135mm, together with its overwhelming bokeh, highlights the subject and creates dimensional portraits achievable only with this lens.
*1 The effective aperture diameter is calculated by dividing the focal length by the F-number. It refers to the diameter of the light beam that forms an image at the center of the image sensor. A larger effective aperture results in a shallower depth of field and more pronounced bokeh.
Optical design optimized to produce the natural bokeh
Thorough correction of chromatic aberration, which is common in telephoto lenses, achieves clear bokeh without color bleeding.
The design also minimizes vignetting, rendering natural, near-circular bokeh even at the edges―fully utilizing the wide-open aperture.
Sigma’s craftsmanship behind the beautiful bokeh
A 13-blade diaphragm maintains a circular bokeh shape, while exceptional precision in aspherical lens processing further enhances its smoothness.
This beautiful, natural bokeh is the result of Sigma’s know-how gained through development of F1.4 prime lenses over many years and the advanced manufacturing technology cultivated at its Aizu factory.
Clear subject detail even at maximum aperture
Four large FLD glass elements are positioned, along with strategically placed high-dispersion glass elements to thoroughly suppress axial chromatic aberration, which tends to be more pronounced in large-aperture telephoto lenses. As a result, the lens delivers crisp subject detail even when shot wide open, making full use of the exceptionally shallow depth of field unique to a 135mm F1.4.
Floating focus system for consistent sharpness
A floating focus system moves the two focus lens groups independently, ensuring consistently high resolution across the entire focus range.
Dual HLA for fast, precise autofocus
Each of the two focus groups is driven by its own HLA (High-response Linear Actuator), forming a dual HLA system.
By incorporating two distinct types of HLAs, each optimized for the movement range of a focus group, the dual HLA system ensures both the high thrust needed for large-aperture telephoto lenses and fast, precise AF performance. This allows even fleeting expressions and fast-moving subjects to be captured with exceptional reliability.
Designed to minimize flare and ghosting
Flare and ghosting, which reduce image quality, are addressed under all conditions of incident light, based on the most advanced simulation technology and Sigma’s Super Multi-Layer Coating. High backlight resistance enables clear and sharp images under any lighting conditions.
Various shooting assist functions
Dust- and splash-resistant structure*¹ and water- and oil-repellent coating
In addition to a dust- and splash-resistant structure, the front element of the lens features a water- and oil-repellent coating, allowing photographers to shoot without concerns even in harsh outdoor environments.
*1 The structure is designed to be dust- and splash- resistant, but not waterproof. Be careful not to bring the lens in contact with a large amount of water. Water inside the lens may cause major damage and even render the lens unrepairable.
Excellent build quality of Sigma’s Art line specifications
Metal components such as aluminum and magnesium alloys are combined with engineering plastics like TSC*¹, strategically placed throughout the construction. This balances the durability required to support the optical system of a large-diameter lens with the lightweight design necessary for comfortable handling. The Art line offers remarkable rigidity, durability, and build quality for long-term reliability as a tool of expression.
*2 TSC (Thermally Stable Composite) is a type of polycarbonate with a thermal expansion rate similar to that of aluminium. It has a high affinity to metal parts, which contributes to high quality product manufacturing.
Arca-Swiss compatible tripod socket for long studio shoots
The lens comes with a lightweight yet robust tripod socket made of magnesium alloy, compatible with Arca-Swiss clamps. It provides excellent stability during studio sessions and extended shooting, helping photographers stay focused on their creative expression. The tripod socket is also removable and can be replaced with the supplied protective cover.
Supplied hood with a button-type locking mechanism
The supplied hood is equipped with a button-type locking mechanism for secure attachment and removal. It is constructed from CFRP, a polycarbonate material reinforced with carbon fiber, making it both lightweight and durable.
LENS CONSTRUCTION
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FLD GLASS
MTF CHART
There are two types of MTF chart. One considers the diffraction quality of light, which is called "Diffraction MTF", and the other, "Geometrical MTF" does not.
The quality of light appears in the diffracted light, and becomes more distinct as the F value gets bigger, resulting in lower image quality. Also, diffracted light exists at every aperture, which is why Sigma has been releasing Diffraction MTF data from the beginning since it is very close to the actual image data.
The advantage of using "Geometric MTF" data is that it is easy to measure and calculate since it does not consider the diffraction quality of light, yet it tends to show higher values in the graph than actual images.
The readings at 10 lines per millimeter measure the lens's contrast ability ( red lines), repeating fine parallel lines spaced at 30 lines per millimeter measure the lens's sharpness ability (green lines), when the aperture is wide open.
Fine repeating line sets are created parallel to a diagonal line running from corner to corner of the frame, are called Sagittal lines (S) and sets of repeating lines vertical to these lines are drawn, called Moridional (M) line sets.
*The MTF chart gives the result at the wide-open aperture.
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Spatial frequency |
S:Sagittal Line |
M: Meridional Line |
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10lp/mm |
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30lp/mm |
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DIFFRACTION MTF
GEOMETRICAL MTF
HLA (High-response Linear Actuator)
HLA is Sigma's proprietary linear motor. It drives the focus lens directly without going through gears or other mechanical parts, resulting in quiet, high-precision autofocusing.
Water and oil repellent coating
Incorporates a water and oil-repellent coating that allows water to be wiped away easily and prevents oil and fat from sticking to the surface, even in challenging shooting conditions. At the same time, the maintenance of the lens surface becomes easier.
Aperture ring
Aperture ring, designed to help users work intuitively
Aperture ring click switch
Mounted with a de-click function for removing clicks by the aperture ring click switch, enabling seamless operations that are especially useful such as during video shooting.
Aperture ring lock switch
A ring lock system to prevent from unintended movement of the aperture ring during shooting.
AFL button
The AFL button can be assigned with various functions widens the range of operations available on the lens.
Focus Mode Switch
Using this swich, it is possible to switch the focus mode between AF and MF.
Dust and Splash Resistant Structure
This lens features a highly effective dust and splash resistant structure with special sealing at the mount connection, manual focus ring, zoom ring, and cover connection.
*Although this construction allows the lens to be used in light rain, it is not the same as being waterproof, so please prevent large amounts of water from splashing on the lens. It is often impractical to repair the internal mechanism, lens elements and electric components if they are damaged by water.
Mount Conversion Service available
Support for switching between linear and non-linear focus ring settings (for L-Mount only)
Compatible with Sigma USB Dock UD-11 (sold separately / for L-Mount only)
Every single lens undergoes Sigma’s proprietary MTF measuring systemOS Switch
