Sony FE 20mm F1.8 G Review

Recently I was looking to grab a rental lens for an extended camping trip in Minnesota. Typically I gravitate towards 3rd-party class (cost reasons), but this time I decided to rent out the Sony 20mm F1.8 G and give it a shot.

Why You Can Trust Me

Chance (that’s me) has been practicing photography for 10 years and has been a paid professional for most of it. I bought my first Sony in 2018 so this website is the culmination of about 5 years of Sony experience (full site history). I ended up renting this particular lens for roughly two weeks to take on an extended roadtrip in Minnesota (read how I review/test gear).

This lens honestly blew me away. So, in this review, I’ll be covering my impressions of this (incredible) wide angle lens, along with sharing many of my sample photos. Let’s dive in!

  • Razor-sharp/beautiful images
  • Bright F1.8 aperture
  • Blazing fast autofocus
  • G series build quality
  • Aperture ring & custom button
  • Pretty much absolutely nothing

Verdict: Despite not even being super expensive, the Sony 20mm F1.8 G is pretty much the absolute best wide angle you can get for full-frame cameras. It’s an absolute beast. Keep reading for my opinions or see what others have had to say about it (affiliate link).

man holding sony 20mm f1.8 g mounted on sony a7iii
Me trying not to look goofy holding the lens.

Size & Weight

To start out this review, we’ll first be talking about size & weight. Although I’m typically a fan of compact lenses in general, I was really shooting for something small this time since I’d be taking it camping/adventuring.

Size-wise, we’re looking at a length of roughly 3.3in (8.5cm). This is pretty standard for a full-frame lens and I found it balanced well enough on my a7iii. No size-related issues when tossing it in my sling. As for weight, it comes in around 13oz (370g). Not bad.

Build Quality

Now, since this is a G-series lens, it has got to be built like a tank right? Yep, it certainly is.

The Sony 20mm F1.8 G has a barrel that is primarily made out of metal. It has a sort of slightly textured/bumpy finish that just feels great. For real, words cannot describe it. This lens, despite being fairly “standard” in terms of size and weight, just gives off such a premium, high-end vibe.

sony 20mm f1.8 g build
Honestly, this thing feels great to just hold. The build is fantastic.

With that being said, unfortunately, this lovely metal design doesn’t extend to the accessories. The lens comes with your typical front and rear caps (pinch for the front, twist for the back) along with a small lens hood.

The lens hood is plastic, but it seems to be made out of some heavy-duty polycarbonate (oh, and it is reversible for easy storage). I was fairly careless and rough when taking it on and off, and it didn’t deform, dent, or scratch at all.

Fellow rain enthusiasts will be happy to know that the Sony 20mm F1.8 G offers pretty much full-weather sealing. You’ll get: a gasket around the lens mount, internal seals, and some sort of special coating on the front element to repel water.

I didn’t get to test any brutal rainfall, but I did take it out in light drizzles and near a bunch of waterfalls. No problems at all when paired with my weather-sealed a7iii.

waterfall in minnesota
The lens is fully weather sealed, so taking it out during rain (aka the best time!) is totally safe.

Typically in my reviews, I like to ask the question if a lens is “built to last”. It might be obvious, but I think this one definitely is. Heavy-duty materials, full weather sealing, and it comes from a lineup of lenses (G-series) that is well known for their durability. Yeah, this thing will last.

great lakes freighter on a foggy morning
Just like this massive Great Lakes freighter, the lens feels built to last.

From an ergonomics standpoint, the lens feels awesome to use. First off, the relatively reasonable size and weight make it comfortable to carry for extended periods of time.

I have weak hands (lol), so a lot of lenses start to cause cramps and discomfort after a bit, but I was able to lug this thing around for a couple hours at a time with minimal issues (plus, it’s small enough to just toss in my bag when needed). All the switches (there is a physical AF/MF switch by the way) and rings are easy to access and feel “good” to operate.

Speaking of which, this lens features a physical aperture ring! I absolutely adore aperture rings, especially when they’re done as well as the one on this lens. The ring is incredibly clicky and feels awesome to use. Switching to “Auto” (or, in other words, body-controlled aperture) takes a little bit more of an extra push so you can’t accidentally bump it.

For those who prefer declicked rings, Sony actually included a handy-dandy little switch that lets you adjust it to your preference! I personally love the satisfying click, but I know many people (mostly video shooters) preferred a declicked ring.

In addition to the lovely aperture ring, the lens also includes a customizable button. I, to be completely frank, rarely use customizable buttons on lenses (I just sort of forget as I have everything set up on the camera body) but it’s always nice to see as I know it’s a feature many photographers enjoy.

Next, aesthetics! I understand that beauty is often subjective, and the appearance of a lens isn’t nearly as important as… well, everything else, but I figured I’d touch on it.

I’ve always been a big fan of the look of Sony’s G lenses, and this one is no exception. The text engravings look great, the colors (bits of red here and there) contrast well, and the giant G is always iconic.

Image Quality

Alright, so now that we’ve got build quality, aesthetics, etc. out of the way, let’s get into the real meat and potatoes of the review: image quality!

So, wide open, this thing is a beast. Throughout my time developing this site, I’ve used a LOT of lenses (seriously, like way too many) and I’ve rarely seen wide-open performance this good. As you’d expect, centers are razor-sharp. Corners, believe it or not, aren’t very far behind. If you pixel peep to the extreme, you may see some slight softness, but it’s really remarkable.

park point marina inn in duluth mn
Not the best photo composition-wise, but it shows off how sharp the lens is even at F1.8.

In most lenses, stopping down a bit is necessary to draw out the full sharpness of the glass, but this one is already so sharp wide open that dropping your aperture just serves to (of course) get more depth of field. Like, corners are almost razor sharp at F1.8, so they’re quite literally flawless when stopped down to even just F2.8.

Again, maybe an extreme pixel peeper might find an issue somewhere, but I personally can’t. By the way, this is probably a good time to mention that this isn’t sponsored (I’m sure it seems that way, lol!). Sony didn’t bribe me to say nice things (pssst… Sony: you’re welcome to send me free lenses anytime though…), this lens is just so damn well built and I love it.

Now, with that all being said, some lenses are razor sharp but still suffer from issues like distortion, vignette, CA, and flaring. But this one… really doesn’t.

Being a first-party lens, the built-in distortion correction is really solid. If you’re an architecture photographer or anyone else who takes pictures of straight lines, you might notice extremely minor bending if you look closely, but the performance really is quite impressive.

waterfall in minnesota
Just another pleasant waterfall.

Using this thing in Minnesota, I naturally took a lot of pictures of (beautiful) Lake Superior. When I take pictures of lakes/oceans, I typically expect I’ll have to fiddle with distortion in post a bit to get an even horizon, but I just… didn’t with this one.

Vignetting is also automatically corrected and looks great, but performance is a bit shaky if you (for whatever weird reason) turn off the automatic corrections. With lens corrected disabled, we actually see some pretty heavy darkening of the corners when shooting wide open, but it is entirely remedied by stopping down to at least F2.8.

In most reviews, I add a little slide gallery showing uncorrected vs corrected distortion/vignette. There’s not much of a point with this lens, but I’ll include it anyway (barely perceptible).

In all my lens tests, I try to force chromatic aberrations. Usually, I do this by photographing a car at midday or shooting backlit leaves against a sunny sky. Continuing a common trend, the lens handles CA perfectly. I even shot a picture of my car’s emblem during mid-day sun (a typical “failure” for most lenses) and the purple fringing is incredibly minimal.

Finally, flaring is also very well controlled. No lens is entirely immune to flare, of course, but the Sony performed exceptionally. Even shooting directly into the sun, I could only get a tiny (TINY) amount of ghosting in the frame. See the photo below.

As for bokeh, you typically wouldn’t expect much out of a wide-angle lens, but the F1.8 aperture makes for some pretty decent background blur. It’s not amazing, but thanks to the close focusing distance (more on that in a bit), you can get some nice blown-out backgrounds when shooting at F1.8.

Here’s a bokeh comparison for your reference (swipe gallery).


So, everything else about this lens is fabulous, but how is the autofocus? Well… Yeah, I have no complaints here either.

For stills, autofocus is absurdly fast. Like I mentioned earlier, I primarily test (rent/own) third-party lenses. These days, third-party lenses have excellent autofocus, but I quickly learned when using the Sony 20mm F1.8 G that they can’t compare to an OEM.

Seriously, the AF speed on this thing was frighteningly fast. When using AF-C (subject tracking), it blew me away how easily the lens kept focus locked. EyeAF too, despite being a wide angle, was pretty accurate as well.

For video shooters, AF is also stupidly fast and also dead silent. There is also no focus breathing. That, combined with the fact that this lens is a perfect focal length for recording yourself, makes this thing fantastic for vlogging.

Manual Focus

But what if you prefer to do things by hand, so to speak? Manual focus works well and is enjoyable to use.

It is, like most modern lenses, focus-by-wire, meaning it’s electronically controlled. So, you won’t get any hard stops or perfectly tactile feedback like you would with, say, a Voigtlander, but I still found it enjoyable and precise.

woman looking at waterfall
Manual focus feels good to use.

Other Notes

Before we close out this review, there are a couple of random things I want to touch on.

For those considering this lens for applications of astro, it is a fairly solid pick. Coma control is pretty good. Not perfect, but pretty good. You’ll likely see a bit of minor star stretching in the corners, but overall it performed pretty well. That being said, if you’re looking to do -exclusively- astro and nothing else, I’d suggest considering the Sony 14mm F1.8 instead.

Second, the Sony actually has a fairly close focusing distance. Minimum focusing distance is about 7in (18cm-ish). This is, of course, only about .20x magnification, so we’re not looking at a legitimate macro lens by any means.

But still, the close focusing distance does allow you to get some “fun shots” along with some highly detailed close-ups. The close focus and absurd sharpness allowed me to get some really pretty shots of various flowers and rain-speckled leaves.

macro photo of a leaf
It’s no dedicated macro lens, but you can take some pretty nice close-ups.

Final Thoughts

Anywho, before we finish this all out, I would like to offer up a few alternatives (at various price ranges) for your consideration. Do note that, honestly, the Sony will be your best bet if cost isn’t a concern.

A cheaper, budget-friendly alternative would be the Samyang 18mm F2.8. Pros of the Samyang are that it is smaller and a LOT cheaper (more than 1/2 the price). The cons are that, well, it’s weaker in every other way versus the Sony.

Another commonly recommended lens in this focal range is the Tamron 20mm F2.8. Just like the Samyang, it is smaller and even more cheap (seriously, this thing is dirt cheap, especially for an AF full-frame lens). That being said it, just like the other alternative, is weaker in literally every single other way versus the Sony. You can my read my full review of it here.

car overlooking duluth harbor
Unlike my Prius, the Sony 20mm F1.8 is sharp, fast, and beautiful.

So yeah, in case it isn’t obvious by now, I absolutely love the Sony 20mm F1.8 G. This lens offers pretty much everything I ever wanted in a wide-angle and, to be frank, I’m almost considering flat-out buying it now that I’ve had to send it back to the rental company.

Stupidly sharp, built like a tank, crazy OEM Sony AF. What more could you ask for? If you’re not on a hyper-tight budget and are looking for the, frankly, best wide angle you can possibly get, buy this thing. I’ll drop a purchase link below if you’re interested in picking it up for yourself, thanks for reading!

Buy from Amazon <– affiliate link, which means I get a (very) small commission at no extra cost to you. Thank you for the support. <3

Additional Sony 20mm F1.8 G Sample Photos

coast guard ship in harbor
A rather large coast guard ship. The F1.8 aperture sure came in handy for shooting at dusk.
fallout shelter sign
Seeing old fallout shelters is quite rare, but it’s always neat.
car on gravel road
My poor car being subjected to a brutal gravel road.
small waterfall with rocks
Yet another waterfall.

Thanks for reading everything! If you decide to purchase, please consider using my link as I get a small commission (at no extra cost to you). This allows me to continue making these in-depth, honest reviews. Thank you! 🙂