Fully leaked Sigma 17-40mm f/1.8 E-mount press text!

This is the press text for the new Sigma 17-40mm f/1.8 APS-C E-mount lens that will be announced on June 17:

Sigma lens preorders (open on June 17)
17-40mm f/1.8 at BHphoto, Amazon, Adorama, Fotoerhardt, WexUK.
12mm f/1.4 at BHphoto, Amazon, Adorama, Fotoerhardt, WexUK.

Sigma 17-40mm F1.8 DC | Art

Overview
A standard zoom lens with a large F1.8 aperture and exceptional image quality comparable to prime lenses across the entire zoom range.
Designed for APS-C mirrorless cameras, this lens pushes the boundaries of still and video photography expression.
The Sigma 17-40mm F1.8 DC | Art builds on the innovations of the Sigma 18-35mm F1.8 DC HSM | Art, which was the world’s first zoom lens with an F1.8 aperture.

Major Improvements

• Wider zoom range: 17–40mm vs. 18–35mm
• More than 30% lighter
• Improved optical and physical design for better portability

Key Features

Prime-like Optical Power

• Constant F1.8 aperture throughout the zoom range
• Ideal for low-light conditions and soft background blur

Outstanding Optical Performance

• High resolution even wide open at F1.8
• Uses precision aspherical elements
• Reduces chromatic aberration and sagittal coma flare

Flexible Framing
Zoom range: 17–40mm (equivalent to 25.5–60mm in full-frame). Covers wide-angle to portrait scenarios without changing lenses.

Reduced Flare & Ghosting
Multi-layer coating and advanced simulations reduce flare, delivering rich and high-contrast results.

Portability & Versatility

Internal Zoom

• Lens length remains fixed during zoom and focus
• Stable for handheld, tripod, and gimbal use

Lightweight Design

• Over 30% lighter than the previous 18–35mm
• Uses a smaller 67mm filter
• Compact enough for daily use and travel

Dust & Splash Resistance

• Front element coated to repel water and oil
• Not waterproof – caution advised in wet environments

Controls & Video Support

Dual AFL Buttons
Two programmable AFL buttons, accessible in both horizontal and vertical shooting positions (depends on camera compatibility).

High-Speed Autofocus
Uses HLA (High-response Linear Actuator) for fast, quiet, and precise focusing – suitable for both photo and video.

Minimal Focus Breathing
Reduces angle-of-view shifts when focusing – enables smooth and natural focus pulls in video.

Aperture Ring with Configurable Functions

• Manual aperture control ring with click ON/OFF
• Lock switch prevents accidental changes
• Canon RF version has a control ring instead, no aperture ring or click/lock switches

Technical Specifications

• Lens Construction: 17 elements in 11 groups (4 SLD, 4 aspherical)
• Angle of View: 79.7°–39.1°
• Aperture Blades: 11 (rounded)
• Minimum Aperture: F16
• Minimum Focusing Distance: 28 cm
• Maximum Magnification Ratio: 1:4.8 @ 40mm
• Filter Size: 67mm
• Dimensions: φ72.9mm × 115.9mm
• Weight: 535g

Supplied Accessories

• Lens Hood LH728-02
• Front Lens Cap
• Rear Lens Cap

Optional Accessories

• USB Dock UD-11 (L-Mount)
• Ceramic WR Protection Filter (67mm)
• WR Protection Filter (67mm)
• UV WR Filter (67mm)
• Circular PL WR Filter (67mm)