Sigma 8-16mm f/4.5-5.6 DC HSM lens

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8–16mm f/4.5–5.6 DC HSM
MSRP
$1100 USD USD

The Sigma 8–16mm lens is an enthusiast-level,

optical zoom and focus with inner lens tube elements responding to these parameters.[5] The lens has hypersonic zoom autofocus
.

The lens is sold in versions that fit the bayonet mounts of Nikon, Canon, Sigma, Sony/Minolta and Pentax APS-C cameras.[6] The lens has been discontinued by Sigma Corporation in 2020.[7]

Specifications and measurements

The lens is equipped with a built in lens hood. It comes with a front cap, a ring to mount the front cap and a rear cap.

The lens measures 106 by 75 millimetres (4.2 in × 3.0 in) and weighs 555 grams (1.224 lb). It has a bulb-like

PC Magazine's Jim Fisher says the lens is relatively large and heavy;[8] A reviewer at photozone.de says that for a wide-angle lens the dimensions are unusually narrow but long.[5]

The sleeve is threaded, making it compatible with 72mm filters, but vignetting is severe with the sleeve in place.[4] The construction is plastic although the lens' rear mount is metal.[3][6] The distance meter is recessed inside a window, but no depth of field meter or infrared index is present.[3] The 7/8" zoom ring is made of raised rubber ridges and operates over a 75 degree turning radius. The focus ring is similarly constructed with more closely spaced ridges and a 100 degrees of turning action. The ridges of both rings are parallel to the lens.[3]

The only physical controls on the lens are the AF/MF toggle switch and the two rings, controlling the zoom and focus.[8] The lens does not have image stabilization. This is common for wide-angle photography which can be performed well using hand-held techniques.[6] Over the range of focal lengths, the minimum and maximum aperture vary.[3]

Autofocus

Canon Rebel T3i
with Sigma 8–16mm f/4.5–5.6 DC HSM lens. Bottom with sleeve and cap

The lens features a

Sigma 10–20mm f/4–5.6 EX DC HSM, Tamron 10–24mm f/3.5–4.5 DI II, Nikon 10–24mm f/3.5–4.5G ED AF-S DX, and Tokina 11–16mm f/2.8 AT-X Pro DX lenses).[3][4] The lens' autofocus feature is not functional with Pentax ist* series and K100D DSLR cameras that do not support hypersonic zoom mechanics.[1] The lens is capable of focusing from infinity to minimum focusing distance and back in under a second: so micro focusing is rapid.[3] However, because of the narrow focus range (0.13x) the lens is not suitable for macro photography.[3]

Distortion

The lens exhibits significant distortion in keeping with the problems of wide-angle lenses.[5] The complex barrel distortion is approximately 2.9% at 8 mm focal length but is fairly insignificant as the focal length is raised above 12 mm, according to Photozone.de.[5] PC Magazine reports 3.1% distortion at 8 mm and 0.7% at 12 mm.[8] It also reports that distortion switches to pincushion distortion of 1.4% at 16 mm.[8] SLAR Gear reports that the point of convergence between barrel and pincushion is about 13 mm.[3] Foreground subjects seem abnormally large compared to similar background subjects with this lens.[4]

By combining the wide angle focal lengths with narrow apertures, the lens provides strong depth of field rather than making blurred backgrounds.[4] The lens is constructed with a hybrid aspherical lens that when combined with two glass mold elements provides excellent correction for distortion as well as astigmatism.[1]

Vignetting and field of view

As all lens systems, natural vignetting (gradual reduction of an image's brightness from the center towards the periphery) is present due to Lambert's cosine law – this becomes more pronounced at shorter focal lengths.[5] Wide open at 8 mm, about 0.75 EVs of shading are apparent at the corners, while at 16 mm only about 0.25 EV of shading is noticeable when comparing the corners to the center.[3] For most of the focal length range of the lens, there is between a half stop and third stop of corner shading.[3] Alternatively, stopping down to higher f-numbers lessens vignetting.[9]

full-frame digital SLR (left to right: 8 mm, 12 mm and 16 mm focal length
).

The lens is equipped with a

full-frame digital SLR-compatible mount allowing the usage of both APS-C sized cameras and formats larger than APS-C – the built in lens hood however visibly restricts the field of view (FOV) on formats larger than APS-C – see example above.[1][3] The FOV in APS-C sized cameras is further restricted at shorter focal lengths if the front cap adaptor ring is not removed – see example below.[5]

digital SLR camera (left to right: 8 mm, 10 mm, 12 mm, 14 mm and 16 mm focal length
).

Resolution

The lens'

modulation transfer function (MTF) metrics for its image resolution (sharpness) were described as "surprisingly impressive...throughout the entire zoom range" by Photozone.de.[5] The sharpness, in terms of line widths per picture height (LW/PH), is most uniform at 8 mm (especially near the f-number of 8 where it is even throughout the image) with strong numbers at the center, borders and corner. Higher focal lengths were less impressive.[5] Optical tests were consistent with lab results pointing to excellent sharpness.[10] However, exposure testing seems to belie the stated f-number capabilities of the lens, since stopping down from widest aperture did not change results, according to Gietler.[10]

At its widest aperture, the sharpness does not meet the 1800 threshold at either 8 mm (1572, f/4.5) or 12 mm (1356, f/5), but at 16 mm (f/5.6) it achieves over 2000 lines per picture height. However, stopping down improves the sharpness at all focal lengths, according to PC Magazine. At 8 mm, 1800 is reached at f/8, while at 12 mm it is still only at 1509 by f/8.[8] The image quality is asymmetric with better performance on the right side.[4] At 8 mm and f/4.5, it has 1 blur unit in the center and 1.5 in the corners.[3] Although the images are slightly sharper at f/5.6, SLR Gear claims sharpness declines significantly at f/11 to almost 2 blur units with further stopping down increasing blur to 3.5 at f/22.[3] At the longer focal lengths for this lens, stopping down to f/29 yields a 5 blur unit result.[3]

Chromatic aberration

The lens is the first that incorporated Sigma's FLD glass elements, designed to correct color aberrations like

megapixels that images are commonly captured at.[5] According to Sigma's website, Super Multi-Layer Coating reduces flare and ghosting.[1] As one zooms out with this lens chromatic aberration becomes significant at the corners.[3]

Action photography

The aperture stop-down focal lengths make the lens a laggard among wide-angle lenses.

DSLR cameras have improved at higher ISO settings.[4] However, wide-angle photography (below 16mm) continues to need stronger lighting than is possible by built in flashes if trying to make up for low light situations.[4]

Close focus and macro

At 8 mm and 16 mm, respectively, the lens is able to focus on an area 12.25 inches (31.1 cm) and 7 inches (18 cm) in width.[6] Although the official close focus distance is 24 centimetres (9.4 in),[1] Scott Gietler reported that by using the spot-focus mode, rather than multiple focus points, he was able to achieve a 3 inches (7.6 cm) minimum working distance (glass to subject).[6]

Critical commentary

The lens is useful for deliberative shots by landscape photographers and other skilled artists.[8] The challenge of the vast field of view may be overcome by some casual users.[8] Car photographers benefit from the new perspective of this lens.[4] The lens was a 2010 American Photo Editor's Choice.[1]

Notes

  1. ^ a b c d e f g Sigma Corporation (2010). "8-16mm f/4.5-5.6 DC HSM". Retrieved 2012-08-26.
  2. ^ "PMA 2010 Show Report". Digital Photography Review. 2010-05-04. Archived from the original on 2012-08-24. Retrieved 2012-08-31.
  3. ^ a b c d e f g h i j k l m n o p q Alexander, Andrew (2010-08-26). "Sigma 8-16mm f/4.5-5.6 DC HSM (Tested)". SLR Gear. Retrieved 2012-09-06.
  4. ^ a b c d e f g h i j k Carnathan, Bryan (2010-11-22). "Sigma 8-16mm f/4.5-5.6 DC HSM Lens Review". Digital-picture.com. Retrieved 2012-08-29.
  5. ^ a b c d e f g h i j k l m n "Sigma AF 8-16mm f/4.5-5.6 DC HSM - Lab Test / Review". Photozone.de. 2010-05-01. Retrieved 2012-08-29.
  6. ^ a b c d e f g Gietler, Scott. "Sigma 8-16mm Specs, Design, Focus and Operation". Underwater Photography Guide. Retrieved 2012-08-30.
  7. ^ "8-16mm F4.5-5.6 DC HSM | DISCONTINUED LENS". SIGMA Corporation. Retrieved 2020-11-01.
  8. ^
    PC Magazine
    . Retrieved 2012-08-29.
  9. ^ Gietler, Scott. "Sigma 8-16mm chromatic aberration, vignetting, barrel distortion, flare". Underwater Photography Guide. Retrieved 2012-08-30.
  10. ^ a b Gietler, Scott. "Sigma 8-16mm sharpness tests". Underwater Photography Guide. Retrieved 2012-08-30.

External links

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