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magnification and axial chromatic aberration have been corrected. From infinity to macro, it achieves
superior image quality through entire zoom range. This lens offers extraordinary expressive power and
is capable of surpassing the requirement of the rigorous checking process of our new MTF measuring
system “A1”.
5. Large maximum aperture of F2.8
The aperture value is F2.8 at the wide end (17mm), and is F4 at the telephoto end (70mm). The bright
viewfinder aids focusing and composition of images. The fast apertures also offer useful functions
such as fast shutter speeds to prevent an object from being blurred and ensuring a smooth bokeh in
the background.
[Other Features]
Optical Stabilizer
Sigma’s own unique OS (Optical Stabilizer) function is incorporated. It offers effective correction of
approximately 4 stops, which makes it possible to compensate for camera shake even in macro range
photography where a small blur can be easily identified.
*1. The closer the lens is to the object, the less effective the OS function is.
*2. For Sony and Pentax, OS function is not incorporated.
Flare and ghosting conscious design
In order to achieve high rendering on this flagship lens, flare and ghosting were thoroughly measured
from an early stage to establish an optical design which is resistant to strong incident light such as
backlight. The Super Multi-Layer Coating reduces flare and ghosting and provides sharp and high
contrast images even in backlit conditions.
Incorporating Rounded Diaphragm
The 7 blade-rounded diaphragm creates an attractive blur to the out-of-focus areas of the image.
Hyper Sonic Motor
The HSM (Hyper Sonic Motor) ensures high speed and quiet AF as well as full-time manual focus
override by rotation of the focus ring. With the enhanced AF algorithm, smoother AF is achieved.