I saw minimal focus breathing during focus pulls on the wide end, though you can see a bit of size changing at the telephoto end. It’s all good news, though, as the focus is quiet, focus pulls are accurate and smooth, and there is little to no hunting or settling. If you watch the video review you can see/hear the focus motor during focus changes in video. The Sigma 24-70DN utilizes a stepping focus motor (STM) that makes fast, quiet focus changes. Sigma 28-70mm F2.8 DN Autofocus Performance Here’s a look at how the 28-70DN compares to some competing options (I’ve manually added the information for the 28-70mm since it isn’t available to retailers yet). Sigma has adopted a similar philosophy here, recognizing that by eliminating the traditional need for a standard zoom to go to 24mm, Sigma’s engineers would be freed to not only create a much smaller lens (the Sigma 24-70 DN, at 835g, is nearly 78% heavier than the 28-70DN!) but also to eliminate some of the frankly massive amount of barrel distortion we saw on the 24-70mm. They’ve designed lenses that often have slightly reduced zoom ranges and eschew a lot of features in order to allow them to produce smaller, lighter, cheaper lenses that are still optically competitive (and sometimes better) than the much more expensive first party Sony lenses. Part of Tamron’s success on Sony (particularly with their zooms) has come by choosing a slightly unconventional route. If you prefer to watch reviews, you can choose either the long-format definitive review or the shorter standard review.įollow Me Patreon | My Newsletter | Instagram | Facebook | Twitter | Flickr | 500px Sigma 24-70DN Build, Design and Handling So join me as explore the highs and lows of this compact standard zoom for Sony or Leica. Sigma clearly wants a piece of that success…but they’ll need to provide some compelling reasons to the choose the 28-70DN over the Tamron or their own 24-70mm F2.8. That versatility is what makes such a lens so useful for so many things, and helps explain why the Tamron has sold so well at this same price point. You can shoot wide angle landscape shots like this: While the 28-70mm F2.8 DN has a smaller zoom ratio than competitors, there’s no question that this is still an incredibly useful zoom range…particularly in such a compact lens. The 28-70DN seems to be a zoom lens to compliment the compact prime lenses of the i-Series. Sigma’s focus recently seems to be on addressing the secondary market of those who want good optical and build quality but want smaller, more compact lenses to pair with smaller cameras like the Sony a7C, the Sigma FP, or Leica SL2-S. Certain people love Sigma’s large aperture ART series lenses and their highly corrected optical performance, but others find them unnecessarily large and heavy. These lenses addressed the reality that most of Sigma’s recent lenses have largely been well, large. We’ve seen Sigma dive into the more compact lens market in the past year with the i-Series (24mm F3.5, 35mm F2, 45mm F2.8, and 65mm F2 lenses, all of which I’ve reviewed and you can find in this playlist). You can see from the photo above that the Sigma manages to be smaller even than the Tamron (though it does give up 5mm of focal length on the zoom end), so that helps open up another potential angle of Sigma’s logic. I’ll bear this in mind in my review, and, since I own the Tamron (I use it regularly for my channel and also for its general purpose flexibility), I have the luxury of being able to do a number of direct comparisons to help you make an informed decision if you are deciding between the two lenses. The Tamron has been the best selling lens in the world since its release a couple of years ago, and it is different enough in kind from Sigma’s 24-70mm F2.8 DN that Sigma clearly felt a more direct competitor was warranted. Sigma is obviously banking on successfully addressing two different markets, and there’s no question that they have Tamron’s wildly successful 28-75mm F2.8 RXD in their sites ( my review here). We all like a lower price, sure, but it feels like you are giving up a lot for that $200 in price difference, including losing a significant 4mm off the wide end (24mm vs 28mm), trading a full dust and splash proof design for a one with minimal weather sealing (a gasket at the lens mount), and the loss of a focus hold button and zoom lock. The 28-70DN comes with a Contemporary badge rather than an ART designation, has a smaller size and zoom range, and also comes with a smaller price ($899 USD). It’s only been 13 months since the release of the Sigma 24-70mm F2.8 DN, a lens I felt was a strong alternative in both performance and price ($1099 USD) to the much more expensive Sony G Master version ($2198 USD). I spent my first little while after opening the lens trying to wrap my mind around Sigma’s logic in releasing this particular lens…now.
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