I’m back with another Yongnuo (YN) review. I was interested in covering their most recent lens on the strength of what I’ve seen from the 11mm F1.8 WL Pro I’ reviewed on Sony and the 50mm F1.8 DSM Pro that I reviewed on Fuji. 33mm is a very important focal length on APS-C, giving you roughly 50mm (49.5mm) full frame equivalent angle of view once you add in the 1.5x APS-C crop. Add a fast maximum aperture of F1.4, a host of features, and a good optical performance, and you’ve got an interesting lens. The Yonguo 33mm F1.4S DA SAM WL Pro can be had for well under $300, and it arguably adds a lot more features and versatility than any other lens that it competes with. Should this be your new “normal lens” for your Sony E (tested here), Nikon Z, or Fuji X-mount camera? You can find out my full thoughts by watching the video review below…or reading on.

Follow Me @ YouTube | Patreon |  Instagram | Facebook | DA Merchandise | Flickr | 500px | X

Thanks to Yongnuo for sending me a review sample of this lens. As always, this is a completely independent review. *The tests and most of the photos that I share as a part of my review cycle have been done with the APS-C mode (26MP) of my Sony a7RV camera.

__________________________________________________________________________________________________

As noted, this is a fast “normal” lens. Normal lenses are so called because they cover an angle of view similar to what your eye sees, thus the kinds of images you can get look “normal” or easily relatable, which is why the 50mm focal length is so popular.

The YN 33mm (as we’ll call it for brevity) is a very feature rich lens, as we’ll see, but one of those innovations requires purchasing an inexpensive (under $25) remote control unit that leverages a 2.4gz wireless module built into the lens. Far from just being a basic remote control unit, this remote control allows you to remotely control focus, do aperture racking, set up A-B focus pulls, and more basic functions like take photos, start video, and do whatever you have the function button programmed to do. It’s a very clever little device particularly for video functions as you can do some of these key movements without touching the lens and introducing vibration.

The 11mm F1.8 was the first of a new series of lenses from Yongnuo that they call the “Commander Series”, and this 33mm will be joined by a 23mm and 56mm F1.4 lens.

If you don’t speak Yongnuo, let me break down what those letters mean in the 33mm F1.4S DA DSM WL Pro lens designation. In many ways this follows the Fuji naming convention which puts a list of features right in the name.

• S = Sony, or Sony E-mount
• DA = APS-C
• DSM = Digital Stepping Motor
• WL = Wireless control
• Pro = upscale build, additional features

The YN 33mm has a lot going for it, including a great focal length, great functionality, and fairly strong image quality.

There are also a few weaknesses along with many strengths, and we will break down it all in our review.

Build and Handling

The 33mm focal length has been a fairly popular one over the past few years, with a variety of releases from first party brands (Fuji) and third party brands like Viltrox, Tokina, and Meike. The YN 33mm shows well in this class, however, with the lowest price and more features. This does come at the cost of some weight, however, as the Yongnuo is the heaviest lens at 370g (13oz), though the Fuji lens is a close second at 360g. The Viltrox and Tokina lenses seem to essentially be twins, and have identical dimensions and weight (270g).

The extra weight is due to have a little extra girth and length. The YN 33 is 69mm in diameter (2.7″) x 87mm (3.4″) in length, which is over 13mm longer than the Fuji 33mm lens. The front filter threads are a common 58mm size.

You’ll note the “Wi-Fi” radio signal logo next to the lens designation. Yongnuo continues to be the only company I know of utilizing this, though I have seen Bluetooth in a few Viltrox lenses.

That extra length is at least well used. The other three lenses I’ve been mentioning have an aperture ring (as does this lens), but the Yongnuo adds several other features, including the ability declick the aperture, a custom/function button, and a two mode-custom switch that allows you tweak the behavior of the ring.

As noted, this is a very feature rich little lens. We have a function/focus hold button on the left side of the barrel. That function can be assigned from within the camera.

There’s also a custom switch that allows for a few different functions. In one mode, it serves a an AF | MF switch, with mode I being AF while mode II will switch to MF.

The manual focus ring has a nice feel to it overall, though the weight is on the lighter side. There is no obvious stepping, however, so focus moves fairly smoothly as I use the MF ring. You can program the custom switch to this function by turning the camera off, setting the position to II, and then holding the custom button down. Then power the camera back on, and you will feel a click in the lens.

To use the optional remote control, turn the camera off, set the switch position to I, and then hold down the function button while turning on the camera. Now position “I” will mean that wi-fi is turned on for remote communication while position “II” will mean that it is turned off. I would recommend keeping it in the off position when it is not in use. I haven’t noticed a battery drain issue, but you can essentially assure that this won’t be an issue by turning it off.

The YN 33mm also has a robust approach to aperture control. It has an aperture control ring with one third stop detents between F1.4 and F16 along with an automatic position that can be accessed past F16 (there is a firmer detent there to keep from accidental switches between the two). The feel of the clicks is good, with clear delineation of each position but without being rough.

There is also a declick option with a switch on the right side of the barrel. Click that switch and you can smoothly rack through the aperture, which is particularly useful for video work.

The aperture iris itself has 9 rounded blades to help ensure circular specular highlights when stopped down.

The lens barrel is made of metal, and it has a nice, anodized black satin finish. The lens design is very clean and modern.

A petal-shaped lens hood is included. While it isn’t anything particularly special, it is sturdier than some and bayonets into place with a reasonably precise feel.

There is a USB-C port for firmware updates covered by a small rubber gasket. Be careful when pulling it out, as it is small and wouldn’t be hard to lose. It’s also nearly impossible to pry out unless you have a small prying tool, like a very small flat screwdriver.

The USB-C port will allow for quick and easy firmware updates, which is a smart move by Yongnuo considering that they are a third party lens maker, so they may have to rely on firmware updates to maintain compatibility with cameras in the future. The lens does include a USB-C cable in the box in case you don’t have one.

There is a metal lens mount with a weather sealing gasket attached. Yongnuo also claims a fluorine coating on the front element to resist fingerprints and moisture.

A number of these lenses all share a rather poor minimum focus distance, with only the Fuji 33mm allowing for a closer 30mm distance. The Tokina and Viltrox are both 40cm, with the Yongnuo right under that. That will give maximum magnification figure of right over 0.10x, which is not very good.

The remote control has a small LCD screen and is primarily controlled through the main knob that can be clicked to switch through various functions and rotated to control those functions. There are two buttons for programming A and B focus pulls (just set the focus position, hold down the corresponding button for one second, and either “A” or B” where appropriate will light up. There’s a power switch on the side and also a custom button on the side that corresponds to the custom button on the lens. Clicking it will enable whatever function is programmed to that button on the lens.

Using the remote isn’t always intuitive, but if you’ll spend a few minutes with the included user manual it becomes easy enough to use. Range is up to 30 meters, which definitely gives you some flexibility for controlling off camera.

The fact that the Yongnuo is both the cheapest ($268 USD) and most feature rich lens in the bunch is pretty impressive, though it is also the biggest and heaviest. This is all relative, however, as the lens isn’t abnormally large or anything.

Autofocus and Video

Yongnuo has equipped the 33mm F1.4 with what they call a “digital stepping motor” (DSM). I’m not entirely sure how a digital stepping motor varies from a typical stepping motor, so I suspect this is mostly their own marketing language. My copy of the lens (prerelease) did need a firmware update to ensure full compatibility, but after the firmware update has functioned well. Focus speed is pretty good, and I’ve gotten good accuracy even in narrow depth of field situations.

There is almost no noise to be heard even if I put my ear next to the lens barrel. There is the slightest buzz from the motor, but so quiet as to be nearly undetectable. Focus speed is good, too, with near instant transitions from one focus point to another either indoors or out. This is one of the speedier STM motors that I’ve tested, which is great for a third party lens from a smaller brand.

I found that real world precision was good, whether I was shooting a human subject:

…or with a simple subject like these lingering red leaves late in November.

It’s worth noting with the shot above that I was testing the Megadap ETZ21 Pro adapter with my Nikon Z8 and using the Sony FE 50mm F1.4 GM (one of my favorite lenses) on it. I was a little frustrated as the Megadap combo was being reluctant to focus on the foreground subject and kept sticking on the background even though, for the most part, autofocus was quite good. I also had the YN 33mm mounted on my a7RV, and so I took the same shot (the one above) right after that, and was amazed at how effortlessly the YN 33mm grabbed the right subject and focus properly on it.

I did a series of available light portraits, and was really pleased by how effectively the lens focused. I used a lot of foreground branches for natural frames, but autofocus was consistently good.

If we zoom into that last photo, for example, we can see that focus is accurate and that the lens produces very usable sharpness even at F1.4:

As with most third party lenses, if your goal is tracking fast action, you might want to go with a Sony lens (not that there are many in this focal range), but for most people in most situations, autofocus for stills was pretty great.

Video AF

On the video front I found mostly good results. Focus pulls were smooth with minimal steps. Focus breathing is definitely present, but it isn’t egregious.

The YN 33mm did mostly fine with my “hand test” as well, where I alternately block the view to my face with my hand and then remove it. Focus transitioned nicely from my hand to my face, though there was a time or two when it didn’t move from my face to my hand.

Video footage generally looked good, though, and having fairly confident focus helps to keep details crisp when operating at large apertures. Here’s a freeze frame from one of my clips:

I also had fairly good results with video clips where I slowly moved the camera to force change from one subject to another at varying depths of field. Focus transitions were fairly well damped, and overall autofocus feels pretty capable.

Yongnuo 33mm F1.4 Image Quality Breakdown

The YN 33mm has an optical design of 11 elements in 9 groups. The majority of these are exotic elements, including high refractive elements and ultra low dispersion elements. A lot of fancy glass for an inexpensive lens!

The MTF chart shows a very consistent performance with a nearly flat performance across the frame. The F8 graph levels out some of the dips and rises, but only offers a few percentage points of improved performance. That speaks to a pretty great wide open performance.

The biggest practical negative I saw was some fringing in certain situations, but overall I was pretty impressed with the general optical performance.

Now, interestingly, in this particular image I felt like fringing was pretty well controlled, with minimal amounts of green fringing on a few of the textures. In other images, however, I saw much more pronounced LoCA, or Longitudinal Chromatic Aberrations that come before and after the plane of focus. Here, for example, you can see fringing in the lettering on the lens, on edges of the SLR, and then green fringing around the specular highlights.

That fringing was evident on my chart as well, so just be aware that this is probably the most significant optical issue with the YN 33mm.

Lateral chromatic aberrations (LaCA) were not at all an issue, with nice and clean transitions from black to white near the edges of the frame unmarred by fringing.

For those hoping to get some kind of stealth full frame lens, prepare to be disappointed. You can see that a lot of the full frame image circle is mechanically obscured by the lens.

This is an APS-C lens, period. It will still work fine in APS-C mode on Sony cameras for either stills or video, however. As is almost always the case, you would be better served by buying a full frame lens if you want full frame coverage.

There’s a bit more barrel distortion than I expected in a normal lens along with some vignette.

I used a +9 to correct the barrel distortion. It was fairly linear in correction, so even with a manual correction I could get a good result. The vignette is moderate, requiring a +57 to correct, or in the two stop range. Both of these are well within the range of easily correctable.

So how about resolution and contrast? My tests have been done on a 26MP APS-C mode of my Sony a7RV. Here’s the test chart:

Here are F1.4 crops at roughly 200% from across the frame (center, mid-frame, and lower right corner).

On a flat chart like this, the sharpness results are good but not exceptionally good at F1.4. I’m actually more impressed with real world results, which is good news for the real people who shoot real subjects.

In this real world shot, there is a tangle of dead branches that has coverage near the edge of the frame as well, and we can see that while contrast isn’t top notch, there is plenty of detail across the frame.

But field curvature shouldn’t be as much of an issue when shooting at infinity, and in real world results I noticed the corners being softer (as noted).

For portrait work I felt that there was plenty of sharpness. Even a fairly deep crop at F1.4 shows nice detail.

There’s a mild contrast boost at F1.8 that grows a bit further by F2:

There’s a more obvious bump from F2 to F2.8. where contrast and detail are obviously improved.

If we swap back to a real world subject, we can see at least part of the reason. The aberrations that produce fringing (and thus reduce contrast) are vastly reduced, allowing the native sharpness of the lens to shine a little more obviously.

There is a bit more to be gained at F4, and then another jump at F5.6. Now even the corners are looking pretty crisp.

Real world landscape shots from F4 to F8 will look nice, with good detail across the frame.

Sharpness peaks around F5.6, with F8 being very close to the same. Diffraction will start to soften the image after that, with a mild amount at F11 but a more obvious amount by F16:

Often the tradeoff for a bit of uncorrected fringing is softer bokeh. I wouldn’t consider the bokeh quality to be absolutely top shelf, but it is pretty nice overall.

Here’s another shot with a nice, soft rendering.

Here’s a shot where the subject is further, so nothing is completely blurred out, but it shows how you can still create some subject isolation at this distance.

Flare resistance is mostly good. I had good results where the sun was very brightly right out of frame.

You can see some ghosting in this landscape shot, as the sun hit the elements at obviously a more difficult angle for them.

My review period landed in a season in November when the sun was rather shy. A lot of grey days, so I didn’t get a lot of bright sun to contend with. I did take a quick peek at Christopher Frost’s review, however, and it seems like he had a fairly decent flare outcome, so I feel like what I did see was representative of the overall performance.

Yongnuo’s optical glass is fairly good but not top notch. Colors were mostly good, however, though not quite as special as what you’ll get from higher end lenses.

But it’s important to remember that this is a lens that costs under $270. I would say that the overall rendering is pretty great for the money. When compared to other lenses in this price class I think the optics are competitive and the feature set is clearly much more robust than what competing lenses offer. If you’d like to see more image samples, check out the image gallery here.

Conclusion

The Yongnuo 33mm F1.4S DA DSM WL Pro is a pretty attractive option if you’re looking for a 50mm equivalent lens on your APS-C camera. It is a feature rich, focuses well, has weather sealing, and delivers a pretty strong optical performance, too.

It certainly bests the competition that I’ve seen from Viltrox and Tokina, and prices in much lower than any competing first party lens that I can think of.

Although I was shooting in a difficult season of the year (in between autumn and winter), I felt like I didn’t have a hard time getting images that I liked. I’m pretty amazed by how good budget lenses are these days. In 2016 I reviewed a Samyang 21mm F1.4 fully manual lens that had zero features, and that lens cost $450 at the time. Flash forward eight years and all the inflation that we’ve seen, and you’re still getting a lens with autofocus, weather sealing, a declickable aperture, a custom button, the ability to wirelessly control the lens…and paying nearly $200 less. That’s really pretty astounding when you stop and think about it. That makes the Yongnuo YN 33mm F1.4 well worth consideration.

Pros:

• Nice looking lens with nice build
• USB-C port for firmware updates
• Good manual focus ring and experience
• Very feature rich
• Weather sealed
• Declickable aperture
• Wireless remote control
• Custom button
• Autofocus motor is quiet and fast
• Good sharpness wide open
• Excellent sharpness stopped down
• Fairly good bokeh
• Great price to performance ratio

Cons:

• Some fringing issues
• Gasket for USB-C is hard to remove and easy to lose
• Low magnification

_________________________________________________________________________

GEAR USED:

Purchase the Yongnuo 33mm F1.4 @ B&H Photo | Amazon | Amazon Canada | Amazon UK | Amazon Germany

___________________________________________________________________

Purchase the Sony a7RV @ B&H Photo | Adorama | Amazon | Camera Canada | Sony Canada | Amazon Canada | Amazon UK | Amazon Germany 

__________________________________________________________________

Purchase the Sony a6600 @ B&H Photo | Amazon | Camera Canada | Amazon Canada | Amazon UK | Amazon Germany | Ebay 

Purchase the Sony a6400 @ B&H Photo | Amazon | Amazon Canada | Amazon UK | Amazon Germany | Ebay 

_________________________________________________________________

Want to support this channel? Use these affiliate links to shop at: B&H Photo | Amazon | Adorama | Camera Canada | Amazon Canada | Amazon UK | Ebay | Make a donation via Paypal

Buy DA Merchandise https://bit.ly/TWIMerch

Keywords: Yongnuo, YN, 33mm, F1.4, Yongnuo 33mm F1.4, DSM, WL, F1.4, Pro, APS-C, Review, Sony a6700, a6000, a6400, Sony a7RV, Wireless, Review, Hands On, Dustin Abbott, Real World, Comparison, Sharpness, Bokeh, Flare Resistance, Autofocus, Image Quality, Sample Images, Video, Photography, let the light in, weathersealing, #letthelightin, DA