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CAMERA

Sigma 18-35mm f/1.8 DC HSM A Lens Review

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The standard magnification lens for APS-C-formatted camera as expected is proud to have a fast f/1.8 max aperture through the zoom range and silent focusing with more important manual control. We have a post-produced sample to test here and it will fit the Canon, Nikon and Sigma cameras, with the recommended retail price of $1,199.

Processing and features

Though this lens is proud of having f/1.8 max aperture through zoom range, it still weighs 665g, not much as you may think. Solid structured quality with high-quality plastic is used for the rest of the lens. This lens feels comfortable on Canon EOS 60D which is used to test and will be better balanced on cameras having slightly larger gripping. The lens is covered with a glossy metal layer by parts and both the magnification and focusing ring work smoothly, which strengthen the high-quality feeling of the lens.

Sigma 18-35mm f/1.8 DC HSM A Lens

Sigma 18-35mm f/1.8 DC HSM A Lens

A still HSM focusing motor powers the focusing kit, which confirms very fast and accurate focus, even on this post-produced model. If your lens can display focusing errors, the new lens of Sigma which supports USB Dock accessories, allows you to adjust focusing and updates the software that’s applied with the lens, quickly and easily. Focusing and magnification is performed internally, so the 67mm filter doesn’t rotate, making the lens ideal for using with polarizing and graduated filters.

Manual focus is completely applied by simply adjusting the focusing ring at any minute. Manual focusing worth your satisfaction as the focusing ring is quite heavily braked, and works smoothly. Closest focusing is 30cm from the sensor surface, excellent for shooting in cramped environment, though the achieved max magnification rate of 1:5.2 can make this lens less suitable for filling the frame of small objects.

the 67mm filter doesn’t rotate, making the lens ideal for using with polarizing and graduated filters

The 67mm filter doesn’t rotate, making the lens ideal for using with polarizing and graduated filters

Performance

At 18mm and max aperture, the sharpness at the center of the frame is already excellent, clarity toward the image border is quite excellent, which is quite impressive for a lens with f/1.8 max aperture. Reducing the aperture a little bit will improve the sharpness, with performance peak obtained between f/2 and f/2.8 for this focal length.

Zooming to 24mm creates a sharpness reduction, though this lens is still sharp at this focal length. Sharpness at max aperture is still prominent at the center of the image and the clarity at the edge has lowered to the very good level. Lowering to f/4 creates max performance for this focal length, with outstanding sharpness obtained all over the frame.

Finally, at 35mm, there’s a slight drop in overall sharpness, though the sharpness is still very good all over the frame at max aperture. Max aperture throughout the frame is obtained between f/4 and f/5.6 for this focal length.

Resolution @ 18mm

Resolution @ 18mm

Resolution @ 24mm

Resolution @ 24mm

Resolution @ 35mm

Resolution @ 35mm

Instruction to read the diagram

The blue column represents the record from the center of the image at many apertures and the green one is from the edge. The average of them results in the red column.

The meter on the right is the indicator for real-time image res. The higher the column is, the better the performance is, just that simple.

For this review, the lens is tested on a Canon EOS 600D using Imatest

Chromatic aberration is extremely well-controlled for a magnification lens having such good max aperture. The clearest edge can be seen with the frame border at max aperture of 24mm, though the CA level is low enough to create just a few problems here.

@ 18mm Chromatic aberration

@ 18mm Chromatic aberration

@ 24mm chromatic aberration

@ 24mm chromatic aberration

@ 35mm chromatic aberration

@ 35mm chromatic aberration

Instruction for reading the diagram

Chromatic aberration is the powerlessness of the lens when concurrently focusing on the sensor or all colored-film of the visible light. Severe chromatic aberration creates border or halo around the sharp edge in the image. It can be omitted by software.

Apochromatic lens has special lens component, no spherical, low dispersion… to minimize the problem, so they’re more expensive.

Illumination reduction at the frame corner is not as strong as you predict for a lens with f/1.8 fast aperture all over zoom range. At 18mm and f/1.8 the corner is only 1.25 point darker than the center of the image and at 35mm, the corner is only 1.5 darker. Visual unified illumination is obtained with aperture lowering down to f/4 or more all over zoom range.

Distortion at both ends of the lens is pretty clear, but not too strong with 2.71% body distortion at 18mm and 1.06% pincushion distortion at 35mm. the distortion sample is unified all over the frame, so it will be easy to edit in the image editing software later.

A petal-shaped lid is provided with this lens, the thing that work properly when blocking the lens from unnecessary light which may cause contrast loss or blue. Even when shooting against the light, contrast is still good.

Samples

Wideangle | 1/80 sec | f/6.3 | 18.0 mm | ISO 100

Wide angle | 1/80 sec | f/6.3 | 18.0 mm | ISO 100

`Telephoto | 1/80 sec | f/6.3 | 35.0 mm | ISO 100`

Telephoto | 1/80 sec | f/6.3 | 35.0 mm | ISO 100

Closest focus is 30cm | 1/200 sec | f/2.5 | 23.0 mm | ISO 100

Closest focus is 30cm | 1/200 sec | f/2.5 | 23.0 mm | ISO 100

Quite compelling focus blur| 1/200 sec | f/1.8 | 31.0 mm | ISO 100

Quite compelling focus blur| 1/200 sec | f/1.8 | 31.0 mm | ISO 100

1/1000 sec | f/1.8 | 18.0 mm | ISO 100

1/1000 sec | f/1.8 | 18.0 mm | ISO 100

1/60 sec | f/2.8 | 35.0 mm | ISO 200

1/60 sec | f/2.8 | 35.0 mm | ISO 200

1/100 sec | f/6.3 | 18.0 mm | ISO 100

1/100 sec | f/6.3 | 18.0 mm | ISO 100

1/125 sec | f/9.0 | 18.0 mm | ISO 100

1/125 sec | f/9.0 | 18.0 mm | ISO 100

Price

With the uniqueness at releasing time, having f/1.8 max aperture throughout the zoom range, it’s hard to create face-to-face comparison. However, when the recommended retail price of $1,199 is compared to the current price of f/2.8 lens of Canon and Nikon in the same range, it’s ranked pretty good, especially when this lens is almost $300 cheaper than Nikon 17-55mm f/2.8 and only $105 more expensive than the Canon 17-55mm f/2.8 IS lens. Adding to the cost of the prime lens mentioned in this line will be much more expensive than on any other system.

Conclusion

In the past, Sigma created a niche market so that they could create interesting and new optics that didn’t exist in the product line of any makers, like 15-30mm & 12-24mm lenses for full-frame camera, which was the first of a kind.

This lens opens a new opportunity for the owners of APS-C-formatted camera for lowlight shooting and using creatively the image depth field with a max aperture of f/1.8, normally for lenses with fixed focal length. Provided image quality, especially at shorter focal length belongs to the regular level for fixed-focal length lenses.

Advantages

·         Excellent sharpness

·         Unchanged f/1.8 aperture

·         Less light reduction for a f/1.8 lens

·         Good structure

·         Reasonable price

Disadvantages

·         No actual problem

Rating

·         Features 4.5/5

·         Processing 4.5/5

·         Performance 5/5

·         Price 4.5/5

·         Overall review 4.5/5

Technical specs

Overall

·         Lens support: Nikon AF; Canon EF-S; Sigma SA

Lens

·         Focal length: 18mm - 35mm

·         Viewing angle: 44.2° - 76.5°

·         Max aperture: f/1.8

·         Min aperture: f/16

·         Filter size: 72mm

·         Equivalent: 27mm - 52.5mm

·         Internal focus: yes

Focus

·         Min focus: 28cm

·         Stabilization: no

Structure

·         Blades: 9

·         Components: 17

·         Group: 12

Container

·         Container: front and back lids, lens cap, sleeve

Size

·         Weight: 810g

·         Height: 121mm

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