Sigma 50mm F2 DN (iSeries) Definitive Review | Has Sigma Read the Room?

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Hi, I'm Dustin Abbott, and I'm here today to give you my definitive review of the new
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Sigma 50mm F2 DN from their i-series of lenses. Many of you told me that you weren't looking for
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another premium 50mm F1.4 lens when I reviewed the new Sony G Master lens, and you said
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what you wanted was a high-performing compact 50 millimeter f1.8 lens. Well, will f2 work for you
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Sigma is adding to their compact and premium i-series of lenses with the new 50 millimeter f2dn. This is
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coming for both Sony e-mount along with Leica L. So will this new i50, as we'll call it, check all
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the boxes for you and what you're looking for? Well, we'll find out in our definitive review today
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Let's talk about the build and the handling of this lens. In the big scale of things, this lens is what you would call the medium option
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Obviously, it is larger than a typical 50mm f1.8. I've got a Canon here to step in for a Sony
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It falls in the middle, whereas I have the smallest of the 50mm f1.4 options available
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That's the Samyang AF 50mm f1.4 Series 2 lens. And so you can see that it slots nicely in between those two things
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It is still very, very compact, but don't think it's going to be as small as the typical Nifty 50
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and certainly not as light. It is, however, considerably smaller than Sigma's recent 50mm f1.4D and Art Series lens
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And as Sigma themselves point out, this f2 lens is 37% shorter, it is 50% lighter
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and as a price point, it's about $220 cheaper than the f1.4 Art Series lens
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So how small is that? It's 70mm in both diameter and its length
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and it weighs in, that's 2.8 inches by the way, it weighs in at 345 grams, 12 ounces, and it has a 58
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millimeter front filter size. I will quickly note on that that Sigma has elected to not standardize
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the filter size in the i-series lens. So this filter size is I think only shared with one other
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out of nine or ten lenses and some others have a 62 millimeter, some of them have a 55 millimeter
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airfront filter thread. And so there certainly is, you know, some variance when it comes to this
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particular series. That's either a good thing or a bad thing, depending on your perspective
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You know, the upside of that is that you can design each lens and just kind of let the design
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flow for itself without having to force around a shared size constraint. But of course, it also
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means that you're unlikely to be able to share filters across a number of these lenses. It does
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have an AF-MF switch here on the side, but it doesn't have a focus hold button and really no
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other features outside of an aperture ring and a focus ring on the lens barrel itself. It has a
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gasket here at the lens mount, but no internal seals, which is kind of in the standard for the
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i-series lenses. What is here, however, is really beautifully crafted. I'm hard-pressed to think of
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lenses that are nicer than these current i-series lenses in terms of just the overall design
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aesthetic. There's a lot of really, really great textures. Things feel really good. You can tell
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that these lenses are crafted with some love and care for those that care about the aesthetic
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of that, and that's up to including the lens hood, which is a cut above the lens hoods on
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any of Sigma's other lenses. They're all metal. They're beautifully ribbed. It really kind of
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feels like you've got a separated off focus ring here that happens to be the lens hood
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But as a byproduct, there's a real kind of flow of design here that often I don't see in lens design
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where the lens hood feels like something that's been tacked on, kind of an afterthought
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rather than a part of a comprehensive design. So I really do appreciate Sigma's care in designing these lenses
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The fact that it's all metal does give you an option when it comes to your pinch cap
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You either have the typical pinch cap, or you can use a magnetic cap that is included
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Though I will note, it is hard to dislodge the magnetic cap if you have the lens hood in place
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Those of you that aren't big fans of using the lens hood, you'll probably be more of a fan of using the magnetic cap
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for the simple reason that it pops off nice and easily when you have that exposed like that However the pinch cap is easier to remove when you got the lens hood on because you can pinch in the middle rather than having to reach for the side of it Now as noted the aperture ring and the focus ring both of them move very nicely The aperture
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ring feels really, really good and precise, and the ring itself has a really great feel to it
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I will note that while you can lock it into an automatic mode just by kind of a firm detent there
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there is no de-click option here, and so it's all going to be in one-third stop to tenths as a part of that
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The minimum focus distance here is 45 centimeters, giving us an average, at best, 0.14 times magnification
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which is weaker than the recent ART series lenses, and it falls behind a lens like the Sony 50mm f2.5
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which has a much higher, around 0.21 times. And so not necessarily a strength for the lens, though I will note that up-close performance is very good
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nice flat plane of focus, good contrast, good detail, and so it kind of makes up for things a little bit on that front
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So what's here is really beautifully made. However, I will note that it lacks a few features relative to what has become the standard in the nicer Sony mount lenses
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Autofocus here comes via an STM or a stepping motor, and it has plenty of power for most all applications that I saw
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I saw only some very minor visible steps in my hand test
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You can just see that focus kind of happens in two sections rather than one progressively smooth section
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But for all other applications, I really didn't see any kind of stepping as a part of it
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That can be a weakness for stepping motors. This is one of the better stepping motors that I've seen
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both in speed and power and just overall smoothness. You can see that focus speed is really good here, and focus changes are near instantaneous for photography purposes
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I also saw very good IAF tracking for humans, whether it was in kind of a casual portrait setting or an event setting
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I saw very good IAF on animals as well. One thing that I thought wasn't maybe up to the par of some of these recent higher-end 50mm f1.4 lenses that I've seen
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is that when I tried to track NAL approaching the camera and I turned the burst rate up on my
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a7 IV, I found that there was a back focus for about the first half of the sequence
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and then it pulled up to the right place and it remained constant there. And so maybe not
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as quick in focus acquisition in a tracking situation as some of those better lenses
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I will also note, of course, as a third-party lens, if you're shooting on an a9 series or an
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alpha one, your burst rate is going to be limited at 15 frames per second. That's not just with this
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lens that's with any third party lens. Now, when it comes to other video tracking, when I approached
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the camera, I saw smooth transitions. I didn't see any of those visible steps. I felt like it
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picked up my eye pretty quickly after coming back on frame. Also, when doing focus pulls
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they were very smooth and quiet, though you will see, particularly if you look at the left side on
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the window, that there is some pretty obvious focus breathing. And so if your priority is video focus
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you might want to look at something like the Sony 50mm f2.5G
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because it might be a better video option. It has the ability to de-click the aperture, has dual linear motors
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It is going to be eligible for focus breathing compensation if you have a camera that is so equipped
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And so it just gives you a little bit more flexibility when it comes to video acquisition
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Though for stills and for normal video work, I was perfectly satisfied with what I saw here
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It got the job done. And even if I go back just a little bit
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I would say that this was an exceptional autofocus performance, you know, relative to what I had seen
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previously. So overall, my impressions walking away were very positive. Now, let's talk about
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image quality, because Sigma actually touts that this little 50mm f2 is as strong in the center
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and the midframe wide open as the Art Series lens. Though, as we're going to see on our image quality
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breakdown, there's a little bit more nuance maybe to add to that. Let's dive in and let's take a
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look at the overall optical quality of the lens. So we'll start by taking a look at vignette and
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distortion. So as you can see on the distortion front, there's really not a whole lot to see here
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And so in this area, we're actually much better off than the new 50 millimeter F1.4 DN. There is
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however, a fair amount of vignette. And as you can see, it penetrates quite far into the frame
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which is going to give images a little bit of a heavier look to them if you leave it uncorrected
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Over here on the right, you can see I've done a manual correction here, a pretty straightforward
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plus one to deal with the distortion and a plus 51 to deal with the vignette
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So that's about two stops of vignette. And you can see I've moved the midpoint all the way over to allow that to brighten up
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all the way into the middle of the frame. Now, of course, there is a correction profile that will clear things up, either in camera
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for raw or video or excuse me, for JPEG or video. Raw files will be a correction profile that will come to software, which I have used here
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And you can see here that the image has quite a bit of a heavier feeling prior to that vignette correction
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After the correction, it feels a little bit lighter, a little bit airier than what it does
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So I think in many situations, you'll probably want to correct that vignette. There'll be some situations where it will be flattering
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Now, there is some longitudinal chromatic aberration. We can see here that there a little bit of fringing particularly after the plane of focus here Taking a look from another perspective you can see only a minimal amounts of the magenta fringing but a little bit more pronounced when it comes to the kind of green fringing
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after the plane of focus. You can see in this shot here of congas that on some of these shiny surfaces, you're going
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to see a little of that fringing there. And then you'll see it a little bit when it comes to some of the bokeh highlights, just
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a little bit of outlining there. Nothing too pronounced here, though. now as per usual we're using my sony alpha one 50 megapixels and showing you this at 200
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magnification you can see that there's tons of pop here in the center of the frame great contrast
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wide open you really couldn't ask for much more their midframe looks very good you can also see
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here in this mid area going down to here everything looking really strong and as we go to the corner
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we can see that there is a drop off it's not as sharp towards the edge of the frame however it
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isn't quite as bad as what I thought the MTF suggested. This is really not a terrible performance
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Now we saw that that chart from Sigma showed that wide open, the F2 lens is actually sharper than the F1.4 lens
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at least in the middle through the mid frame. But if you do more of an apples to apples comparison
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you compare them both at F2, we can see that of the two, I would say that I would still give an edge to the Art Series lens
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By F2, it stopped down to where it's a bit sharper. That's even more obvious here in the mid-frame
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which you can just see the Art Series lens just pops there at F2
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We can also see here that it has higher performance. And then down into the corners, you can see that that difference
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in being able to render fine details, look down like in this lattice area here
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you can see that it's just definitely more defined there, much more detail showing up from the Art Series lens
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That's not to take anything away from this F2 lens, because it is extremely sharp
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And so even in this kind of casual, available light shot at F2
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you can see it is just amazingly sharp there on her face
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We can take a look into a more of a landscape type shot or city shot here
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You can see that there is tons of detail here in this shot and that it looks strong even towards the edges of the frame
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In fact, if I compare it to an F5.6 image here, Really the only difference is I see a little bit more contrast from the f5.6 result versus the f2
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But without them side by side, you know, frankly, you would be really hard pressed to tell that difference
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I mean, they both look really, really fantastic. So you've got a lot of optical chops available from wide open on this lens
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And in this case, more of an infinity type landscape. And you can see that there is just great detail all across the frame here
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I don't really see a weak spot as I look across here. I understand that the corners aren't as sharp as what the center is
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but this is not a bad corner performance at all either. And so this is a lens that really is quite impressive in terms of the overall sharpness
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Now, if I compare both of these lenses at f2.8, you can see that in the center, I would give a very mild edge to the Art Series lens
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The same is probably true of the mid-frame. and down into the corners the art series has its biggest advantage though you know frankly both
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lenses look quite good here but if i look at a few other places in the spot yeah i'm going to say
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that there's a little bit more contrast for the art series lens but frankly there's not a significant
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difference between the two optically when i looked at side by side i didn't see a lot of difference
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between f2 and f2.8 on this 50 millimeter f2 lens i saw more of a jump when you stopped on down to
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F4. And as you can see here, contrast has taken a serious bump forward in the center of the frame
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also in the mid frame, showing just higher detail. You can see that there's more detail in this bill
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here. And then down into the corners, we can see now that we're starting to get a really crisp
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looking result in the corners as well. There's a very minor further burst forward at F5.6
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And we can see by F8, you're not really getting any further gains. If anything, I think contrast
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is slightly reducing. So your peak is somewhere around f5.6 on a higher resolution body
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Our minimum aperture here is f22. And as per usual, on a high resolution body, we can
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see that we diffraction is just robbing a lot of the contrast and resolution. So as per usual
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my recommendation is don't go past f11 unless you really, really need to
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So as previously noted, our overall amount of magnification is not particularly high
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but you can see that our performance up close is quite good. Good contrast, good detail there
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If I pop onto a real-world three-dimensional object, you can see it's rendering a lot of fine detail there
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and contrast is holding up quite well, even at very close focus distances
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Now obviously, your ability to compress a background and blur it out at f2
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is not going to be what it is at f1.4. We can see, looking side by side here
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that the quality of the blur is not radically different, but you can just obviously achieve
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a much more of a blurring of a background with a lens with an f1.4 aperture
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like the Art Series lens. Here's a quick look at the geometry. You can see a little bit of that fringing
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that we saw previously There a little bit of a cat eye shape here towards the edge of the frame If you stop down to F2 you get basically all circular shapes all across the frame At F4 that continues to be the case
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We're not really seeing much of the aperture blades yet, though you are starting to see just the beginning of that
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a little bit more of that nonagonal shape. Out in the real world, you can see that up close
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you have the ability to blur out the background quite nicely. Here's a shot now where I've blurred the foreground
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A little bit more outlining here as you get towards a little bit more of a medium distance
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You're not blurring things out quite as much. You know, maybe one of the disadvantages of that smaller aperture there
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Here's another shot of this lock. But again, at close focus distances, you're blurring out a background fairly completely
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And again, I'm very impressed with the up-close performance there, which is really strong
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One final shot here shows just kind of some different edges. You see a little bit of that fringing
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I doubt anything that's going to ruin any shots for you. and as we move towards defocus, it's pretty good
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There is just a little bit more of outlining than what I would like. Overall, however, though, I like the shot
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I like what this lens can do. Now, when it comes to flare resistance, we can see
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you can't really tell because the image has been so resistant to any kind of ghosting or veiling here
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but there's very bright sun that's coming through this window that I've allowed into the frame
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You can see, however, for this shot, though, the contrast has held up perfectly. you can see from the still shot that the sun is in the frame but there's not really any kind of
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negative effect and even when i'm panning across in video you just really don't see at different
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angles any kind of ghosting or veiling if you stop on down you can see that that really continues to
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be the case and this is a very very strong flare resistance now when you're stopped down to f11
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here's a look at what you're going to get as far as the sunburst or sun star effect that is there
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and again even just against a flat blue sky here you can see that there's very little to see in
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terms of any kind of ghosting artifact it's one final shot here that shows how it's holding up
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really quite well again very bright sun coming through the window here in the sauna which is
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otherwise fairly dim inside you can see that there's no nasty artifacts or flare effects that
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are taking place there because this lens has such high contrast i did find that color saturation was
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really strong on it. And so as you can see in this kind of setting, we've got really deeply
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saturated colors. It looks very nice and obviously very, very good detail because this lens has such
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high resolution and contrast. Finally, I did have an opportunity because of a decent night for stars
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to take a look at the coma effect. So you can see that in the center of the frame, star points look
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really very nice. As we move towards the edge of the frame, they do start to become deformed
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There's another cluster of stars up here that you can see a little bit more. Very slight kind of growing of wings there
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But again, it's limited. And so as a byproduct, I would say overall, that's a fairly good effect for controlling coma
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So certainly a lens that if I owned it and I had no, and this was the focal length I wanted
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I wouldn't hesitate to use this for shooting the night sky. Very few optical weaknesses with this lens
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This is a strong performance. And so at the end of the day, you can pretty clearly see that this is a very strong little lens
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and particularly when it comes to the optics, the overall feel and quality of the lens
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the autofocus performance, there is a lot of checks in the positive column for this lens
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and relatively few over in the negative. At the same time, however, this lens does face a lot of very strong competition at its $639 price point
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We've already alluded to the Sony 50mm f2.5G, which is smaller, lighter, and actually less expensive
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Though, I will point it also has two-thirds slower stop maximum aperture
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But, of course, it's also more expensive at the moment than this Samyang lens
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The Samyang is a very good lens that, as you can see, it is physically larger and a little bit heavier
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But, at the same time, it has a faster maximum aperture of f1.4, so a full stop faster
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And of course, there are other options out there as well. And so I think that will be kind of the key issue for Sigma
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is that if they're kind of unique blend of, you know, beautiful design and strong optical performance
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and a, you know, a compact lens, if that is going to be attractive to the right kind of buyer
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On the Leica front, which I always have to consider, even though I'm not a Leica shooter
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I think that this lens makes even more sense. There are fewer options there
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Of course, Sony's e-mount is flooded at this point, but there are fewer options on Leica
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It's a really nice match for some of those smaller bodies that are available there
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And of course, as a price point, it's going to see a little bit more bargain oriented there
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Bottom line is that if you love the concept of the i-series, maybe you have other lenses from the series that you have really liked
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then I think that you'll love this lens. It really does deliver beautifully optically, has great autofocus
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and it has that really charming build and aesthetic to it that makes it a joy to use out in the real world
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I'm Dustin Abbott and if you look in the description down below you can find linkage to my full text review there's also some buying links there if you'd
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like to buy one for yourself link is to follow me or Craig on social media to
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become a patron to get channel merchandise if you haven't already please like and subscribe thanks for watching have a great day and let the
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light in

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Sigma 50mm F2 DN (iSeries) Definitive Review | Has Sigma Read the Room?

Dustin Abbott