Sunday, February 16, 2014

Sigma 35mm f/1.4 DG HSM ART Review


It used to be a joke that the pronunciation of "Sigma" was with a silent "t."

Those days are gone.

Though there are lingering vestiges of the brand as we knew it, it's no longer the case that the value of a Sigma lens was that it is more or less as good as the OEM lenses for less money. It's now more true to say that the best Sigma lenses are equal or better than their Canon/Nikon/Pentax counterparts, and they cost less. This is certainly true of the 35mm f/1.4 DG HSM. For some, the price difference to the other f/1.4 35mm primes would be enough to change sway their purchasing decision, but brand loyalty is not built on price competitiveness alone. As is often the case, lasting brand growth is product lead and not sales driven. For Sigma, it would appear to be a strategy of cultivating photographers who love not only the lower prices, but the lenses themselves. That seems be the case with the 35mm.

Build and Design


The construction of this lens is archetypical of  the refreshed Global Vision line-up. It's shed the drab matte appearance of the previous generation and embraced a new upscale aesthetic. The colour of the material is not quite black, but it has a deepness to it that makes it appear more than just a simple deep grey.... there's depth to how the light falls off of it that gives the plastic body a bit of an obsidian-like glassy sheen. Tolerances are tight and there isn't a trace of wobble anywhere in the lens. The focus ring turns with a smooth damped feeling that is in keeping with the best lenses out there. Focus operation is quick and silent thanks to the HSM mechanics, with no signs of AF hunting or hesitancy in moderately indoor light situations.


Like all of the Global Vision lenses, this is not merely made with a conventional plastic,and instead uses a type of composite material that Sigma has branded TSC(TM), for "Thermally Stable Composite." This is a polycarbonate-based composite. The key benefit of the material appears to be that it has similar thermal expansion properties as metal, meaning that the lens as a whole can be built to smaller tolerances. The interfaces between the plastic parts of the lens and the metal parts can be made smaller, thus reducing size and weight. That said, this is neither a light nor a small lens. It will be at home on a Canon 5D Mark III or a D800, but it will feel distinctly front heavy on a smaller camera like the D7100 or the EOS 70D

Sigma 35mm f/1.4 on Nikon D800

Paradoxically, the size and weight of the lens work at cross-purposes to what a 35mm prime is supposed to do. Classically, the 35mm (film) equivalent field of view is the go-anywhere, shoot in any situation setup for what is commonly known as street shooting. However, unlike the Leica M cameras that typify this approach, any full frame camera with the Sigma 35mm f/1.4 will be ostentatious and heavy. 

Image Quality


All of the qualities that you would expect from a high-grade OEM lens... high resolution, low distortion, smooth out-of-focus rendition... are apparent in the images that the Sigma 35mm is capable of producing. On a crop sensor camera and used as a "normal" prime, this lens is overkill:

f/1.4 on Canon 70D
For an image shot at f/1.4, the results are superb. Contrast and edge crispness are high within the plane of focus on the figurine, and they background bokeh is smooth and lacking any hint of nervousness. There's just a hint of vignetting in the corners, but for the most part, that is a non-issue when used on an APS-C camera. On full frame, the results are still excellent:

f/1.4 on Canon 5D Mark III

The same virtues that were seen on the crop-frame shot are also evident on the full frame image. There's more vignetting present, but no more than what would be typical for most fast prime lenses. Barrel distortion is also very low across the frame of the picture. In controlled objective testing, the Sigma displays some field curvature when used wide open, but it's nowhere near as bad as the equivalent Canon EF 35mm f/1.4L USM and it's fairly close, if not slightly sharper than with the Nikon AF-S 35mm f/1.4G.

Below is the progression of the lens from f/1.4 to f/11 on the Nikon D800. This is an ad hoc test to illustrate what the subjective quality of the bokeh looks like when the lens is focused on an object at short distance - approximately five feet from the camera. The smoothness of the bokeh is partly down to the use of a curved nine-bladed aperture; note the roundness of the pinpoint highlights in the f/1.4 sample.

f/1.4
f/2
f/2.8
f/4
f/5.6
f/8
f/11
This lens produces sharp-looking images at f/1.4, with a fat sweet spot from f/2.8 onward. The high resolving power of the lens is thankfully not marred by lateral or longitudinal chromatic aberration, which is kept tightly under control throughout the aperture range.


Concluding Thoughts


This is a good lens, but is it a good lens for it's application? That's a harder question to ask. For street shooting the problem is that the Sigma mated to a full frame camera becomes a heavy piece of equipment.... not unwieldy, but certainly less discrete than using other possibilities, such as a mirrorless camera or a rangefinder. However, it can't be understated how how well the Sigma 35mm fulfills its commercial purpose by the virtue of it's competence and price competitiveness. Given that the chances are fairly high that owners of the Canon 5D Mark III or Nikon D800 will be using their respectively excellent 24-70 f/2.8 zooms, any prime that falls within this focal length range would have to be something special to warrant use over the more convenient zooms. The Sigma 35mm fulfills this requirement: it's a lens that you'll want to use wide open all the time.

Compared to Canon and Nikon's 35mm f/1.4 lenses, the value proposition is clear. The Sigma costs less and is just as good. However, the Sigma sits between those top tier lenses and Canon/Nikon's entry level primes, the Nikon AF-S 35mm F1.8G ED and the Canon EF 35mm f/2 USM IS. The Sigma is heavier, more expensive and sharper than these two lenses, and of course... it opens up one more stop to f/1.4. These lenses aren't directly comparable, but since the Sigma is only a few hundred dollars more, it's the "aspirational" option. If you are shopping for a lens of this type, the Canon and the Nikon are the logical value-oriented choices whereas the Sigma is the one that makes you save a bit more to reach up to a higher-grade lens. It's not an insignificant amount of money, but it's less of a reach than to the OEM f/1.4 lenses.

The global camera market is forecasted to contract in 2014 but product-wise, Sigma is well positioned to deal with the changing landscape. In a shrinking market, the natural tendency is for companies to head towards the high end where margins are wider than with the low-margin high-volume value end of the market. With lenses like the 35mm f/1.4, Sigma will not only be able to last through the current camera recession, but will be in a better position for the (eventual?/possible?) upturn in the camera market than if they had stayed purely as a value-oriented brand.



With thanks to Broadway Camera 

1 comment:

  1. For DX you already have the 35 mm f/1.8 G DX which gives sharp images. For FX, this Nikkor can be given a miss. No doubt it has amazing optical quality but the caveats like distortion and chromatic aberration are deal breakers after the price paid. This situation is not helped by the fact that it’s all plastic which reduces the lifespan of this glass by a great degree. The Sigma 35 mm f/1.4 for Nikon gives matching performance with reduced distortion and chromatic aberration and is cheaper but without the weather seal. Since you won’t be able to keep either of the lenses forever, it’s wise to pick up the value for money deal. If money is not the crunch, go for better 24 mm f/1.4 G and club it with a 50 mm f/1.8 and you are good to go for ages. Interested folks can read more at http://pixelarge.com/nikkor-nikon-35mm-f1-4-g-af-lens-review/ and Keep Shooting.. :)

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