Sony FE 12-24mm f/4 G MTF Tests

Lensrentals.com, 2017

I usually don’t do any prerelease testing. Mostly that’s because manufacturers will send one prerelease copy to a reviewer. If you tell them you won’t test less than ten copies they look at you like, well, I don’t know what they look at you like because I only communicate by email. But they say nope; you can’t have ten. And I usually (unless I’m really, really interested, which is rare) just decide to wait until it is released.

The other reason I don’t often do prerelease testing is that there’s some gamesmanship about prerelease copies, especially if you’re not a giant review site. I’d rather just review ten purchased copies after release than play games.

With that in mind, I want to practice full disclosure about these ten copies. They are prerelease copies owned by Sony; not by Lensrentals. Sometimes we get the opportunity to test them for Sony before they’re released. I give them the data, make my comments, and keep my mouth shut for a while (because there is, of course, a keep-my-mouth-shut clause in our agreement). Then I wait six weeks until Lensrentals gets copies, test ten of those, and write a blog post.

In this case, because the lens tested really well, I asked permission to go ahead and do the write-up based on the tests of their copies, which they granted. If it had sucked, I wouldn’t have asked. So there, now you don’t have to read the article because I already told you it’s good.

Oh, and because someone is going to scream ‘those are hand picked copies,’ trust me, if most manufacturers could hand-pick half as well as you think they can, there wouldn’t be any reason for us to test them, would there? I’ve been doing this for years, and so far, I’ve never seen a big optical difference between pre-release copies and off-the-shelf copies.

So, About the Lens

Lensrentals.com, 2017

The Sony FE 12-24mm f/4 is a full-frame, ultra-wide angle zoom that will be available in August for about $1700. It has Sony’s ‘Direct Drive Supersonic Wave Motor,’ which is a linear piezo drive, like the one in the Sony FE 85mm f/1.4 GM lens. It has four aspheric elements, a curved aperture ring, yada, yada. Most impressive to me is it’s a reasonably small lens, around 4.5 inches long and weighing about 1.25 pounds (565 grams for those of you who have a logical measuring system). That’s a full pound lighter than the Sigma 12-24mm f/4 Art and Canon 11-24mm f/4 L lenses that I waxed poetic about in an earlier post. And Sony’s price is just a few hundred more than the Sigma and about $1,000 less than the Canon.

Let that soak in for a second. This is a Sony lens, that is not more expensive than the competition. It’s almost July. I’m looking for snow.

Some MTF Results

As always, these are the averaged results of ten copies, each tested at 4 different rotations. Because of the baffle used in the Sony mount there are fewer points to average at 18mm and 20mm away from center, so take those edge measurements with a tiny grain of salt.

At 12mm

Olaf Optical Testing, 2017

This is really very good. I was a bit surprised after I first picked up the lenses, which are tiny compared to the Sigma 12-24mm f/4 or Canon 11-24mm f/4, that the results would be this good.

 At 24mm

Olaf Optical Testing, 2017

The 24mm results follow Roger’s Rule of Wide Zooms; the long end isn’t quite as good as the wide end. But that’s as it should be, we don’t buy 12-24 zooms to shoot at 24mm most of the time. And honestly, it’s still quite good even at 24mm.

Sample Variation

We actually do have a variation number finally set up and approved. But until we’ve recalculated it for 500 lenses, I won’t be presenting it. I will show you our standard variance graph that basically shows you the range of these lenses. It’s better than average. Sony seems to be making progress with their sample variation in the newer designs.

Olaf Optical Testing, 2017

Especially at 12mm, there is almost no variation in the center. As with most wide-angle zooms, if your copy isn’t quite like the others it will probably be at the long end, but this is really a good performance.

Of Course You Want Comparisons

It seemed to me the logical comparison was with the Sigma 12-24mm f/4 Art.

12mm

Olaf Optical Testing, 2017

I’m sure some fanboys will find some hair-splitting here at 12mm, but whatever differences are insignificant.

24mm

Olaf Optical Testing, 2017

At 24mm the Sigma isn’t keeping up with the Sony anymore. The Sony is clearly better both in the center and all the way to the edge.

There aren’t a ton of other logical comparisons to make, but I’ll throw a couple up.

Canon 11-24 f/4 L

There is a real difference between 11mm and 12mm, but still an interesting comparison.

Olaf Optical Testing, 2017

And no, I’m not commenting other than ‘those are both excellent’.

Sony Vario-Tessar T* FE 24-70mm f/4 at 24mm

This is actually a useful comparison because I think people will carry both of these in their bag and may want to choose which to use at times. This is somewhat surprising to me, as usually the short end of the longer zoom will be better than the long end of the shorter zoom. Not true this time.

Olaf Optical Testing, 2017

Summary

This was a test of the MTF of a new lens. It was not a lens review. Had it been an actual lens review you would have been instructed which lens to buy via a handy click link at the bottom of the post. It was simply an MTF test. There are lots of other things that go into selecting a wide angle lens; flare resistance, autofocus accuracy, reliability, how it handles, etc.

The MTF results tell you if the lens should be a sharp lens, and the results here indicate that it should. That makes it worth further investigation for those of you interested in this focal length. It’s one of the more impressive Sony offerings that have come out; reasonable price, excellent MTF, reasonable sample variation.

There is something that is more interesting to me in the bigger picture, though. Sony has made this lens smaller than the others in this range, which will be nice sitting on an FE camera. And they’ve done that without the customary ‘Sony surcharge’, which is nice on  your wallet. At this point, I can’t help but be very impressed.

Roger Cicala and Aaron Closz

Lensrentals.com

June, 2017

Addendum:

Several people have asked about the field curvature of this lens, so I’ve posted the field of focus at 12mm and 24mm. Both are really flat at infinity, most impressive.

Olaf Optical Testing, 2017

Olaf Optical Testing, 2017

Another addendum for the Nikon 12-24

Author: Roger Cicala

I’m Roger and I am the founder of Lensrentals.com. Hailed as one of the optic nerds here, I enjoy shooting collimated light through 30X microscope objectives in my spare time. When I do take real pictures I like using something different: a Medium format, or Pentax K1, or a Sony RX1R.