Sigma 30mm f/1

     

The Sigma 30milimet f/1.4 DC Doanh Nghiệp | C is a smart standard prime for Canon, Sony & MFT crop-sensor mirrorless cameras

ByMatthew Richards06 January 2020


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Our Verdict

The Sigma 30milimet f/1.4 DC DN | C lens for Sony E-mount và Micro Four Thirds cameras is now available for the Canon EOS M system, where it goes head-to-head with Canon’s own EF-M 32milimet f/1.4. The Sigma is similarly compact and lightweight, has the same fast f/1.4 aperture rating but only costs about half as much to lớn buy. It’s a great performer và a proper bargain at the price.

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This Sigma 30mm lens has a maximum aperture of f/1.4, making it perfect for low light scenes (Image credit: Matthew Richards)

Specifications

Mount: Canon M, Sony E, MFTElements/groups: 9/7Angle of view: 48 degreesDiaphragm blades: 9Minimum aperture: f/16Minimum focusing distance: 0.3mMaximum magnification ratio: 0.14xFilter size: 52mmDimensions: 65x73mmWeight: 270g



The Sigma is capable of delivering richly detailed images with impressive sharpness & contrast, along with fairly minimal distortion (Image credit: Matthew Richards)

Build & Handling

When launched, this ‘DN’ Contemporary lens for mirrorless cameras became a counterpart to Sigma’s existing ‘DC’ Art lens for crop-sensor SLRs. Physically, the new lens is 10milimet longer but 10mm narrower, has a smaller 52mm filter thread &, tipping the scales at 265g, is little more than half the weight. Overall, it feels supremely well matched khổng lồ slyên, compact mirrorless bodies from the Canon EOS M, Olympus Pen và OM-D, and Sony A6xxx series of camera systems.


Typical of recent & current Sigma lenses, this one is based on TSC (Thermally Stable Composite) material for its barrel và many of its internal components. This helps lớn enable a robust & sturdy build which retains its integrity during temperature variations, thanks to very little thermal expansion. The lens also comes complete with a high-unique hood that has an anti-slip finish, whereas you need lớn buy the hood as a pricey optional extra for the Canon EF-M 32milimet lens.

As with most lenses for mirrorless cameras, the Sigma 30milimet has an autofocus system based on a virtually silent stepping motor. This naturally requires power from the host camera battery for operation of both autofocus and manual focusing, via the comfortably wide ‘fly by wire’ focus ring. It’s very smooth in operation và enables excellent precision for manual focusing.


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This pair of shots demonstrates the difference in depth of field for close-range shooting, at apertures of f/8 và f/1.4 (Image credit: Matthew Richards)
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This pair of shots demonstrates the difference in depth of field for close-range shooting, at apertures of f/8 và f/1.4 (Image credit: Matthew Richards)

The optical path includes nine elements in seven groups. Two of the elements are aspherical but the lens features neither FLD (Fluorite-grade Low Dispersion) nor SLD (Special Low Dispersion) elements, often used in Sigma lenses lớn boost sharpness and contrast, while reducing chromatic aberrations.


Unlượt thích some lightweight lenses for mirrorless cameras, the Sigma features a durable metal rather than plastic mounting plate. However, it’s not a weather-sealed lens. There’s no optical stabilizer but that’s less of an issue for Olympus shooters & owners of late-generation Sony cameras.

Performance


This quarter-frame crop shows the slight purple and green axial chromatic aberration that can occur when shooting wide-open (Image credit: Matthew Richards)

Sharpness is impressive sầu even when shooting wide-open at f/1.4. At this aperture, you can get a really tight depth of field when shooting at fairly short focus distances. Bokeh (the chất lượng of defocused areas) is pleasantly smooth & remains so when stopping down a little, helped by a well-rounded 9-blade diaphragm.

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The only downside is that axial or ‘longitudinal’ chromatic aberration is sometimes visible when shooting at very wide apertures. Also referred lớn as ‘bokeh fringing’, this shows up as purple and green fringes around high-contrast transitions, in front of or behind the point of focus. Unlike lateral chromatic aberration, which generally only occurs towards the edges and corners of the frame, axial chromatic aberration can occur anywhere in the frame. Even so, the Sigma isn’t an underachiever in this respect, matching or beating many other fast primes including the Canon EF-M 32milimet f/1.4. Reduce the aperture by a single f/stop and the fringing virtually disappears.

Overall performance is highly impressive sầu. Lateral chromatic aberration & barrel distortion are of a low order, & there’s good resistance to ghosting and flare. Contrast remains very good even when shooting wide-open, và colour rendition is excellent.

Lab tests

We run a range of lab tests under controlled conditions, using the Imatest Master testing suite. Photos of thử nghiệm charts are taken across the range of apertures và zooms (where available), then analyzed for sharpness, distortion and chromatic aberrations.

We use Imachạy thử SFR (spatial frequency response) charts và analysis software to lớn plot lens resolution at the centre of the image frame, corners & mid-point distances, across the range of aperture settings &, with zoom lenses, at four different focal lengths. The tests also measure distortion và color fringing (chromatic aberration).

Sharpness


(Image credit: Future)

There’s only fairly minor lateral chromatic aberration, which only tends to lớn be visible towards the extreme corners of the frame.

Distortion: -2.39

Barrel distortion is of a fairly low order and it’s very unisize & easy khổng lồ correct, when necessary.

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Verdict

Lightweight in build và selling price, this is a high-performance standard prime that combines very good build unique and nice handling characteristics with solid all-round performance. Autofocus is fast and accurate, yet smooth & virtually silent for movie capture. Image unique is excellent overall although, as is usually the case with fast prime lenses, axial chromatic aberration can be noticeable when shooting wide-open. All things considered, this Sigma is terrific value at the price.

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