ART24-105mm F4 DG OS HSM
- High image quality with zoom functionality
- Covers the most commonly used zoom range
- Minimizes optical aberrations
- OS (Optical Stabilizer) function*
- HSM (Hyper Sonic Motor) delivers high AF speed
- Inner focusing system
- Slim barrel design with excellent handling
- Super Multi-Layer Coating reduces flare and ghosting
- Exclusive low-dispersion glass
- 9-blade rounded diaphragm
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* Sony A-mount version does not feature OS.
AWARDS
- Hot One Award - Optically Stabilized Standard Zoom 2014
- PC Mag Editors' Choice 2014
A full-frame lens covering the most commonly used zoom range
Offering F4 brightness throughout the zoom range, this lens covers a large variety of scenes, from wide-angle to medium telephoto.
When shooting of scenes in nature or travel destinations, photographers need a high zoom ratio combined with excellent handling to capture all the subjects they encounter. The Sigma 24-105mm F4 DG OS HSM covers the most commonly used zoom range, from wide-angle to medium telephoto. It also takes usability to the next level, offering F4 brightness throughout the zoom range, OS (Optical Stabilizer) functionality, and HSM (Hyper Sonic Motor). Thanks to its convenient handling, the Sigma 24-105mm F4 DG OS HSM is an ideal lens for many types of photography such as snapshots, portraits and landscapes.
* For Sony A-mount (discontinued), OS function is not incorporated.
Rounded diaphragm
When photographing with point light sources such as electric lights or reflections on a body of water in the background, the rounded 9-blade diaphragm helps produce an attractive bokeh effect—even at large-aperture settings.
Featuring a large 82mm filter size and high optical performance that maintains peripheral brightness.
Offering exceptional expressive performance, this lens maintains peripheral brightness, which can be an issue with lenses in this class.
Zoom lenses with a high zoom ratio tend to suffer from astigmatism, field curvature, distortion, chromatic aberration, and other optical aberrations. To minimize these effects, this lens features optimally arranged high-performance single- and double-sided aspheric elements produced by precision glass molding and incorporating FLD ("F" Low Dispersion) glass and SLD (Special Low Dispersion) glass. Minimizing axial chromatic aberration at telephoto distances, this lens offers exceptional image quality throughout the zoom range. In addition, it avoids the reduced peripheral brightness that is common with lenses in the same class. Thanks to its large-aperture 82mm filter size, this lens offers truly outstanding optical performance.
The finest in materials, usability and functionality.
All lenses in Sigma's Art line come with a hood with a high-quality rubberized connector and feature an AF/MF switch, and are designed for intuitive use and superior functionality. Inside, HSM (Hyper Sonic Motor) delivers high AF speed and extremely quiet performance. An enhanced algorithm offers even smoother automatic focusing. Full-time manual focus override is another key feature that leaves the artistic touches in the photographer's hands. The brass mount combines high precision with rugged construction. Its treated surfaces and enhanced strength contribute to the exceptional durability of the lens. In both the external and internal parts, the optimized use of TSC (Thermally Stable Composite), an excellent match for metal parts, further contributes to the high-precision construction of the lens.
HSM (Hyper Sonic Motor)
HSM (Hyper Sonic Motor) delivers high AF speed and extremely quiet performance. An optimized algorithm offers even smoother automatic focusing, and full-time manual focus override is another key feature.
Excellent handling
Positioning the zoom ring at the front of the lens helps make possible a slim barrel design. In addition, the wide, thick zoom ring contributes to the lens's high usability. Thanks to Sigma's inner focus technologies, adjusting the focus and zoom rings does not change the length of the lens, resulting in excellent handling. Since the front of the lens does not move, the lens can be used with a circular polarizing filter.
TSC (Thermally Stable Composite)
The barrel of the lens features TSC (Thermally Stable Composite) that offers minimal thermal shrinkage combined with exceptional hardness. It also offers 25% greater elasticity than polycarbonate. Since its thermal shrinkage is low, TSC matches well with metal parts, further contributing to the high-precision construction of the lens. TSC also makes possible slimmer forms for parts like zoom rings and scaling rings.
Flare and ghosting reduction
From an early stage in the lens design process, flare and ghosting have been measured to establish an optical design resistant to strong incident light sources such as backlighting. Sigma's Super Multi-Layer Coating reduces flare and ghosting to help photographers produce sharp and high contrast images even in backlit conditions. The included lens hood can be attached to block out extraneous light, which can have a negative effect on rendering performance.
High-precision, rugged brass bayonet mount
The brass mount combines high precision with rugged construction. Its treated surfaces and enhanced strength contribute to the exceptional durability of the lens.
LENS CONSTRUCTION
- FLD glass
- SLD glass
- Aspherical lens
MTF CHART
The MTF (Modulation Transfer Function) is one of the measurements for evaluating a lens' performance, and it shows how faithfully the contrast of the subject can be reproduced on the image plane. The horizontal axis shows the image height (distance from the center of the image in mm) and the vertical axis shows the contrast value (maximum value is 1).
The closer the 10 line pairs/mm curve is to 1, the higher the contrast and clarity of the lens is, and similarly, the closer the 30 line pairs/mm curve is to 1, the better the resolution and sharpness of the lens is.
*The MTF chart depicts the result at the wide-open aperture.
*For mirrorless lenses that support distortion correction, the horizontal axis shows the image height equivalent to when an L-Mount lens is attached to a Sigma L-Mount camera with distortion correction applied. (The effect of distortion correction may differ depending on the mount and camera used.)
*The spatial frequency indicates the variation on the image plane before distortion correction is performed.
Spatial Frequency
S: Sagittal Line
M: Meridional Line
10lp/mm
30lp/mm
DIFFRACTION MTF 24MM
DIFFRACTION MTF 105MM
Hyper Sonic Motor (HSM)
The Hyper Sonic Motor (HSM) uses ultrasonic waves to drive the autofocus mechanism. It features extremely quiet operation, high torque, and excellent focusing speed.
OS (Optical Stabilizer) function
Sigma's OS (Optical Stabilizer) function uses sensors inside the lens to detect any motion, then moves specific lens elements in order to effectively minimize blur caused by such movement.
* For Sony A-mount, OS function is not incorporated.
Exclusive low-dispersion glass
Careful arrangement of exclusive low-dispersion glass elements gives SIGMA lenses superlative image rendition untarnished by residual chromatic aberration.
Other
- Rounded diaphragm
- High-precision, durable brass bayonet mount
- Designed to minimize flare and ghosting
- Every single lens undergoes Sigma's proprietary MTF measuring system
- Mount Conversion Service available
- "Made in Aizu, Japan" craftsmanship
