Sigma 120-400mm f/4.5-5.6 DG OS HSM

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Sigma 120-400mm f/4.5-5.6 DG OS HSM Empty Sigma 120-400mm f/4.5-5.6 DG OS HSM

Δημοσίευση από  Την / Το Σαβ Οκτ 04, 2008 11:02 pm

Sigma 120-400mm f/4.5-5.6 DG OS HSM 872008113947
High ratio zoom lens housed in a compact construction and incorporating Sigma’s original OS (Optical Stabilizer) function.
The Sigma Corporation is pleased to announce the launch of the new APO 120-400mm F4.5-5.6 DG OS
HSM.

Incorporating Sigma’s original OS (Optical Stabilizer) function.
Three SLD glass elements and a rear focus system provide optimum image quality throughout the entire zoom range.
Super multi-layer coating reduces flare and ghosting.
The minimum focusing distance of 150cm (59.1”) makes it useful for close-up photography.
HSM ensures quiet and high speed autofocus.
Compatible with Sigma’s APO Tele Converters.
This telephoto zoom lens incorporates Sigma’s original OS (Optical Stabilizer) function. It offers the equivalent of using a shutter speed approximately 4 stops faster. Three SLD (Special Low Dispersion) glass elements provide excellent correction for chromatic aberration. This lens is equipped with the rear focus system that minimizes fluctuation of aberration caused by focusing. It provides optimum image quality throughout the entire zoom range.

The super multi-layer lens coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. The minimum focusing distance of 150cm (59.1”) throughout the entire zoom range and has a maximum magnification of 1:4.2 make it useful for close-up photography. This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF as well as full-time manual focusing capability. The addition of the optical 1.4x EX DG APO or 2x EX DG APO Tele Converters produce a 168-560mm F6.3-8 MF ultra-telephoto zoom lens or a 240-800mm F9-11 MF ultra-telephoto zoom lens respectively.


Sigma has announced an optically stabilized 120-400mm f/4.5-5.6 lens. The lens will be available for owners of Sigma, Canon, Nikon, Pentax and Sony DSLRs. A maximum magnification of 1:4.2 also makes it useful for users who want to get a little closer. The DG designation means the lens will work equally happily on 35mm or APS format SLRs.


APO 120-400mm F4.5-5.6 DG OS HSM


High ratio zoom lens housed in a compact construction and incorporating Sigma’s original OS (Optical Stabilizer) function.
The Sigma Corporation is pleased to announce the launch of the new APO 120-400mm F4.5-5.6 DG OS
HSM.

Incorporating Sigma’s original OS (Optical Stabilizer) function.
Three SLD glass elements and a rear focus system provide optimum image quality throughout the entire zoom range.
Super multi-layer coating reduces flare and ghosting.
The minimum focusing distance of 150cm (59.1”) makes it useful for close-up photography.
HSM ensures quiet and high speed autofocus.
Compatible with Sigma’s APO Tele Converters.
This telephoto zoom lens incorporates Sigma’s original OS (Optical Stabilizer) function. It offers the equivalent of using a shutter speed approximately 4 stops faster. Three SLD (Special Low Dispersion) glass elements provide excellent correction for chromatic aberration. This lens is equipped with the rear focus system that minimizes fluctuation of aberration caused by focusing. It provides optimum image quality throughout the entire zoom range.

The super multi-layer lens coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. The minimum focusing distance of 150cm (59.1”) throughout the entire zoom range and has a maximum magnification of 1:4.2 make it useful for close-up photography. This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF as well as full-time manual focusing capability. The addition of the optical 1.4x EX DG APO or 2x EX DG APO Tele Converters produce a 168-560mm F6.3-8 MF ultra-telephoto zoom lens or a 240-800mm F9-11 MF ultra-telephoto zoom lens respectively.
*1 OS function is not available.


Sigma lens specifications
Lens name APO 120-400mm F4.5-5.6 DG OS HSM
Focal length 120-400mm
Maximum aperture f/4.5-5.6
Minimum aperture f/22
Lens construction 15 groups 21 elements
Angle of view 20.4°-6.2°
Closest focus distance 150cm / 59.1in
Maximum reproduction ratio 1:4.2
Aperture blades 9
Filter attachment size 77 mm
Focusing HSM motor with manual focus override
Dimensions 92.5mm×203.5mm (3.6in × 8in)
Weight 1,750g (61.7oz)
Supplied accessories • Case
• Hood (LH830-01)
• Shoulder strap
• Tripod socket (TS-31)



Clearly a sibling to Sigma's larger 150-500mm f/5-6.3 OS lens, this full-frame tele zoom ($850, street) is almost the mirror image of that longer lens, but about 25 percent smaller. It replaces Sigma's 135-400mm f/4.5-5.6 in the lineup, and it's a significant upgrade for a number of reasons: It uses Sigma's silent HSM focusing motor, is compatible with Sigma teleconverters, and, of course, includes Sigma's Optical Stabilizer. An 186-620mm equivalent when mounted on most DSLRs (that's 372-1240mm -- albeit without AF -- when used with a 2X teleconverter!), this lens incorporates three elements of super-low-dispersion glass for sharpness and is sold with hood, case, and a pretty cool tripod collar.

HANDS ON
The finish is Sigma's new ultra matte-black coat. Almost velvet-like, the surface looks prone to scuffing, but won't scratch (in normal use). Although the removable tripod collar is relatively large, it's cleverly designed with finger channels to help it double as an excellent grip for off-tripod shooting, even a good carrying handle for the lens and camera rig.

At 8.12 inches at its most compact, it's a big lens, but you can handhold its 3 pounds and 12-plus ounces easily due to smart positioning of zoom and focusing rings, and a pleasing balance overall.

The AF is near-silent thanks to the HSM AF motor -- and by the standards of such a long zoom, it's fast-focusing. In field tests, the AF system had no problem latching onto and following approaching cars, bicyclists, even pigeons. We suspect it would do well from gridiron sidelines or at waterside tracking soaring ospreys.

The amply sized zoom ring is somewhat stiff turning, but the smaller, well-placed manual-focus collar is nicely damped and a pleasure to use. Manual focus is possible in the lens' AF mode. Its barrel houses well-marked switches for AF/MF, the OS modes (on, off, and panning), plus a zoom lock at 120mm.


IN THE LAB
The lens delivered Excellent range SQF numbers at 120 and 250mm, indicating superior sharpness and contrast. As with most long tele zooms, however, it dipped into the Very Good range at 400mm. (By comparison, Sigma's 135-400mm plummeted into the Below Average range at 400mm.)

In DxO Analyzer 3.0.1 tests of the lens' distortion control, we detected only Imperceptible barreling at 120mm (0.04%) and Slight pincushion distortion at 250mm (0.12%) and 400mm (0.17%). These are very strong, almost flawless, numbers. And they're noticeably better than those of the 135-400mm, which showed Visible pincushioning at 300mm (0.90%), for example.

Light falloff was gone by f/6.3 at 120mm; by f/8 and 250mm and by f/10 at 400mm -- not great, but no worse than most.

The maximum magnification ratios at the uniform close-focusing distances of approximately 56.6 inches ranged from 1:9.7 at 120mm to 1:3.6 at 400mm. Such magnifying power bodes well, especially for nearby wildlife.

Tests of the Optical Stabilizer found that three unique users obtained sharp pictures at shutter speeds 2 to 2.5 stops slower with the OS engaged than without. We did find the OS action slightly jerky compared with Canon's IS and Nikon's VR, though.
Sigma 120-400mm f/4.5-5.6 DG OS HSM Sigma_120400
CONCLUSIONS
Rather beefy but, on the whole, a delight to shoot with. Relatively easy to handhold in a pinch, and, because of the Optical Stabilizer, it's sharp. Certainly this lens is an excellent choice for distant wildlife or for moderately fast field sports like soccer.


Registration date : 01/01/1970

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