Sigma 30 2.8 đánh giá năm 2024

In January 2012 the Sigma company presented two lenses designed for mirrorless cameras - the Sigma 19�mm f/2.8 EX DN and the�Sigma 30�mm f/2.8 EX DN. If I have to be honest I admit I was very surprised by that launch. In the case of the Micro 4/3 system a small sensor allows you to construct equally small and fast lenses so quite significant Sigma devices with f/2.8 aperture didn’t fit there at all. In Fuji, Samsung and Sony mirrorless systems we deal with an APS-C sensor and in its case the f/2.8 fastness is nothing impressing. Samsung proved it perfectly well designing a 2/30 ‘pancake’ type lens for its system which is characterized by very good optical properties. In such light the launches of Sigma were a total puzzle to me.

The riddle was solved at the beginning of February 2012 when Sigma showed its new DP series compact cameras equipped with a Foveon sensor of the APS-C format. They are offered with 2.8/19 and 2.8/30 lenses. You can suspect Sigma wanted to hit two birds with one stone. As they’ve already produced lenses for their own compacts, ‘disconnecting’ them and equipping with other mounts was not such a big problem. The situation is not as simple as it seems at first glance, though. Although the basic parameters of mirrorless cameras’ lenses, offered in DP Sigma devices, are the same, they differ in other crucial aspects – e.g. the optical construction. It seems the Sigma optics constructors thought it would be easier to introduce some slight changes than to change the aperture or design an entirely new lens from scratch.

We would like to thank the�Sigma ProCentrum company for borrowing the lens for testing purposes.

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Sigma first ventured into the mirrorless space with the release of two lenses for Sony E-Mount and Micro 4/3 in January of 2012 with the 19mm f/2.8 and 30mm f/2.8 EX DN lenses. Around a year later, they released updated versions of these lenses with a new body style, and perhaps minor changes to coatings, though officially no optical changes were made. Today, I’m going to take a look at the newer version of the 30mm lens: The Sigma 30mm f/2.8 DN Art for Sony E-mount. This lens is relatively small, incredibly inexpensive, and provides a normal focal length with a field of view equivalent to a 45mm lens on a full frame camera. It also may be one of the better bargains in photography today.

The Sigma 30mm f/2.8 DN Art on the Sony A6000

If you’re not familiar with my reviews, I review from a real world shooting perspective. You won’t find lens charts or resolution numbers here. There are plenty of other sites that cover those. I review products on how they act for me as a photographic tool in real-world shooting.

Build Quality and Handling

The Sigma 30mm f/2.8 DN Art ditched the matte finish black plastic exterior of the earlier version of the lens and has received a new body that is available in either black or silver. The version reviewed here is the silver version. The lens is constructed of a combination of high-grade plastics with a metal clad barrel and a metal mount. The bottom half of the lens barrel is covered in a thin metal (likely aluminum) and finished in a matte silver paint (along with an inset glossy ‘A’ for the ‘Art’ series of lenses). The top half of the lens is the extremely shiny metal clad focus ring. Having a perfectly smooth focus ring is a bit odd, but it works just fine. The fine silver finish of the focus ring looks beautiful in person, but is also exceptionally prone to showing fingerprints and it also seems to scratch rather easily (though the scratches sort of blend in a bit since the scratch is the same color as the finish. As a result, the lens normally doesn’t look as clean as it does when wiped down or when you first pull it out of the box.

Sigma 30mm f/2.8 DN Art with Hood

The front of the lens has the engraved focal length, aperture, filter size, etc, though unlike most lenses, this information isn’t filled in with white, but rather kept as a black relief. Overall, the lens feels tightly assembled, but falls short of feeling robust. You can tell there are a few corners cut to keep the cost down. Most noticeable is the fact that the focusing group for all of the Sigma DN lenses is a free-floating group controlled by electromagnets. As such, when the lens doesn’t have power, the focus group will rattle around inside. This doesn’t seem to cause any issues at all, but it doesn’t sound reassuring.

The lens is small and the included reversible lens hood doesn’t add much to the size, ensuring that the 30mm will handle well on essentially any camera. One thing to note with this lens (and all the Sigma DN lenses) is that boot up takes a bit longer when these lenses are attached, depending on the camera. There’s an added 1-2 second delay upon turning on the camera before the lens is ready to go when shooting with the NEX-6. However, this delay is all but gone when the lens is mounted on the new A6000.

Autofocus Performance

The 30mm f/2.8 DN Art features a focus mechanism that is generally very quiet, but not totally silent. If you are focusing in a quiet room, you can hear a soft buzz when the focus motor is activated. Autofocus accuracy is pretty good, hitting the target dead on in the majority of situations, though I did have a few times where there was some slight backfocus. I’m not sure whether to blame the lens or the camera for that, though. The speed of autofocus is a bit of a letdown. It’s not particularly slow, but it certainly isn’t fast either, taking between a quarter and a half second to lock focus in most situations.