Lens Description: The Sigma 18-35mm f/1.8 DC HSM is the first zoom lens ever to achieve a maximum aperture of f/1.8 throughout the zoom range. It is a wide aperture, standard zoom-lens for digital single lens reflex cameras with APS-C size sensors. The lens has a focal range equivalent to 27mm - 52.5mm in a 35mm format and it can cover the angles of view of multiple fixed focal length lenses. This wide aperture, standard zoom lens enables the photographer to expand creative possibilities on any occasion.
Photography Life Review Summary: Overall, I am very impressed by the performance of the Sigma 18-35mm f/1.8 DC HSM. It is certainly a game changer, not only because it is the first f/1.8 zoom lens in history, but also because it is a stellar performer. I cannot wait to see more lenses like this from Sigma in the future. If I owned a DX / APS-C camera, the Sigma 18-35mm f/1.8 would have been one of my first candidates for everyday photography. Read the full Sigma 18-35mm f/1.8 DC HSM Review by Photography Life.
Sigma 18-35mm f/1.8 DC HSM Specifications
|Lens Type||Zoom Lens|
|Mount Type||Canon EF, Nikon F, Pentax K, Sigma SA, Sony Alpha|
|Format||APS-C / DX|
|Compatible Format(s)||APS-C / DX|
|Compatible with Teleconverters||No|
|Vibration Reduction / Image Stabilization||No|
|ED Glass Elements||5 SLD glass elements|
|Aspherical Elements||4 glassmold aspherical elements, 5 SLD glass elements|
|Super Integrated / Super Spectra Coating||No|
|Built-in Focus Motor||Yes|
|Silent Wave / Ultrasonic Motor||Yes|
|Minimum Focus Distance||0.28m|
|Accepts Filter Type||Screw-on|
|Weather / Dust Sealing||No|
|Dimensions||78 x 121mm|
|Available in Colors||Black|
Here is how the lens performed according to Imatest:
The lens shows very impressive performance at 18mm both in the center and in the mid-frame. The corner performance is a little weaker, but regains sharpness at just f/2.8. Peak performance is reached at f/2.8, which is remarkable.
The performance at 24mm is even more impressive, yielding very high levels of mid-frame and corner performance. Peak performance is again reached at f/2.8.
Although the center performance drops a tad, mid-frame and corners look the best at 35mm, so there is more balance of sharpness across the frame.
Distortion levels are moderate. At 18mm, there is barrel distortion of -1.25%, which changes to pincushion distortion when zoomed in towards 24mm. Pincushion distortion is at its strongest level at 35mm, where it reaches about 1.52%, as shown in the graph below:
Lateral chromatic aberration levels are pretty moderate at short focal lengths, averaging a little over a pixel. As you zoom in, CA levels drop and reach their lowest at 35mm:
Vignetting levels are very low for an f/1.8 lens. That’s another surprising find, as I initially expected to see much worse vignetting throughout the focal range. Wide open at 18mm, vignetting is only at about 1.39 stops and it increases as you zoom in towards 35mm. At the long end, vignetting reaches about 1.65 stops, which is still very impressive: