Revolutionizing portraits with the world’s first* AF 135mm F1.4.
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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** 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.
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.
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Sigma’s craftsmanship behind the bokeh
A 13-blade diaphragm maintains a circular bokeh shape, while exceptional precision in aspherical lens processing further enhances its smoothness.
This 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 fi eld unique to a 135mm F1.4.
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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.
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.
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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.
Various shooting assist functions
The lens is equipped with an AFL button in two locations, which can be assigned to a range of functions via the menu on selected cameras. In addition to the aperture ring, the lens is equipped with an aperture ring lock switch and a click switch to turn the click on and off.
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Dust- and splash-resistant structure*** 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.
Excellent build quality of Sigma’s Art line specifications
Metal components such as aluminum and magnesium alloys are combined with engineering plastics like TSC****, 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.
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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 fi ber, making it both lightweight and durable.
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LIST OF FEATURES
● HLA (High-response Linear Actuator)
● Water- and oil-repellent coating
● Aperture ring
● Aperture ring click switch
● Aperture ring lock switch
● AFL button (2 locations) *1
● Focus mode switch
● Dust- and splash-resistant structure
● Mount Conversion Service available
● Support for switching between linear and non-linear focus ring settings (for L-Mount only*2)
● Compatible with USB Dock UD-11 (sold separately / for L-Mount only)
● Every single lens undergoes Sigma’s proprietary MTF measuring system
*1 Assignment of functions is limited to supported cameras and assignable functions vary depending on the camera.
*2 Only on supported cameras.
KEY SPECIFICATIONS The figures are for L-Mount
Lens construction: 17 elements in 13 groups (4 FLD, 2 aspherical elements)
Angle of View: 18.2°
Number of Diaphragm Blades : 13 (Rounded Diaphragm)
Minimum Aperture : F16
Minimum Focusing Distance: 110cm / 43.4in.
Maximum Magnifi cation Ratio: 1:6.9
Filter Size: φ105mm
Maximum Diameter x Length: φ111.7mm x 135.5mm / φ4.4in. x 5.3in.
Weight: 1,430g / 50.4oz.
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* As of September 2025, by Sigma.
**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.
***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.
****TSC (Thermally Stable Composite) is a type of polycarbonate with a thermal expansion rate similar to that of aluminium. It has a high affi nity to metal parts, which contributes to high quality product manufacturing.