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Sigma 20mm F2 DG DN Assessment: Luxurious Design, Killer Astro

Whereas Sigma has a status for its Artwork line, it’s the I-series of lenses that all the time catch my curiosity for one most important cause: steel. Just like the others within the sequence, the brand new Sigma 20mm f2 DG DN is a chief lens with a ravishing steel barrel and a devoted aperture ring. Whereas it seems luxurious on the skin, it homes stable optics inside that seize sharp, punchy pictures.

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Whereas the Sigma 20mm f2 DG DN is a fairly priced ultra-wide that appears prefer it prices greater than it does, there are just a few quirks. Chief amongst them, the weather-sealing isn’t all through the entire lens. However, at $699, are these quirks price embracing?

The lens for this evaluation was supplied by LensRentals.

The Massive Image


  • Sharp pictures
  • Some enjoyable flares, but a lot of distinction
  • Punchy colours
  • Stunning steel physique
  • Minimal distortions for astrophotography
  • Devoted aperture ring
  • Moderately priced
  • Not too massive or heavy


  • Solely weather-sealing on the mount
  • Occasional autofocus misses

The Sigma 20mm f2 DG DN is a superbly constructed, steel, prime lens that’s enjoyable to shoot with. The pictures are sharp with punchy colours and distinction, and comparatively little distortion to complain about. The lens is technically nice with numerous sharpness, and it leaves a little bit of room for character with some small flare and that 20mm perspective distortion. And, it isn’t terribly costly.

Nevertheless, the weather-sealing is just on the mount, making it vulnerable to wreck from mud and moisture. It’s not your best option for photographers capturing in inclement climate or working in dusty or sandy environments. It additionally had just a few autofocus misses, however these weren’t widespread.

I’m giving the Sigma 20mm f2 DG DN 4 out of 5 stars.

Gear Used

I used the Sigma 20mm f2 DG DN within the L-Mount model, mounted on the Panasonic S5. A transparent Sigma protecting filter was used as properly. The lens was supplied by LensRentals and the S5 is on mortgage from Panasonic.


As a part of Sigma’s I sequence, the Sigma 20mm f2 DG DN has a steel physique. It makes use of Sigma’s newest optical tech designed for sharp corners and minimal sagittal coma flare. However, they’re not doing something loopy uncommon right here.

Tech Specs

LensRentals lists the next specs for the Sigma 20mm f2 DG DN:

  • Angle of View: 94.5°
  • Autofocus: Autofocus
  • Model: Sigma
  • Compatibility: Full Body
  • Filter Measurement: 62.0mm
  • Focal Size: 20.0-20.0
  • Hood Included: Sure
  • Picture Stabilization: No
  • Merchandise Kind: Lens
  • Lens Kind: Huge Angle
  • Macro Replica Ratio: 1:6.7
  • Max Aperture: 2.0
  • Most Magnification: 0.15x
  • Mfr. Mannequin Quantity: 490969
  • Minimal Aperture: 22.0
  • Minimal Focusing Distance: 0.7feet
  • Mount: L Mount
  • Optical Design: Teams/Components: 11/13
    • Particular Low-Dispersion Components: 1
    • Aspherical Components: 3
    • “F” Low-Dispersion Components: 1
    • Aperture Blades: 9, Rounded
  • Bodily
    • Dimensions (ø x L): 2.8 × 2.9″
    • Weight: 0.8 lb.


The Sigma 20mm f2 DG DN is a reasonably-sized, steel construct, prime lens. This design is one in every of my favorites from Sigma. Metallic lenses with aperture rings are my jam and that’s precisely what this lens is. It brings a beautiful steel prime choice to the E-Mount and L-Mount. And it feels nice within the palms.

The primary management subsequent to the mount is the auto to handbook focus swap. This isn’t solely a pleasant large swap, but it surely’s really color-coded so you possibly can simply see what mode the lens is in even from a distance. In AF mode, there’s a spot of grey beneath the swap. In MF mode, the swap is all black.

The following management is the aperture ring. This ring has a really satisfying click on to it, and it’s properly labeled from f2 to f22, with an A for auto. I did want to verify this ring didn’t twist within the bag when saved, however in any other case cherished the texture of it.

Closest to the entrance of the lens is the handbook focus ring. It is a bit bigger than the aperture ring and, in fact, turns smoother. That makes it simple to inform the 2 controls aside by really feel. 

The entrance of the lens takes 62mm filters. The glass doesn’t take up the complete entrance of the lens, however that’s not surprising for an f2. It ships with a steel, petal-shaped hood.

Construct High quality

The steel construct of the Sigma 20mm feels beautiful within the palms. The click aperture ring is so satisfying to make use of. Sigma actually must make extra primes with any such physique. It’s merely beautiful.

Whereas the construct seems and feels nice, the weather-sealing is just on the mount. With such an opulent really feel to the construct, I actually want Sigma spent the additional couple of bucks for full weather-sealing. I’d hate to see dust have an effect on the gorgeous flip of the rings or to get contained in the lens and have an effect on efficiency and picture high quality. Whereas it seems sturdy, the prospect mud and water may spell bother is bigger than with a lens that’s totally weather-sealed. 

The steel construct makes it really feel sturdy, however a scarcity of full weather-sealing can create overconfidence whereas capturing with this lens in eventualities it shouldn’t be in. After capturing with the Sigma 20mm alongside the seashore and close to the spray of a waterfall, the lens fared okay. The S5 did have some seen mud on the sensor, nevertheless, at the least a few of these mud spots had been there once I first mounted the lens.


The Sigma 20mm f2 did an honest job at specializing in the kind of topics that ultra-wides are usually used for. I didn’t have any points capturing landscapes or structure. I did have just a few snapshot-style pictures that had been inexplicably comfortable. To elucidate {that a} bit additional, we had been specializing in folks in a scene. At occasions, the digital camera and lens would nail specializing in their faces. However then instantly, it will lose focus for some cause. Nevertheless, the autofocus locked on a excessive majority of the time.

With motion in direction of the digital camera, the lens missed often, however nonetheless stored many of the pictures in focus. The S5 doesn’t have the quickest autofocus system, so I can’t say for sure whether or not or not the lens could have any points on one of many super-fast burst modes on a Sony E-Mount. Whereas the miss charge was minor, it was a little bit excessive provided that ultra-wides are inclined to lock on simpler than longer lenses.

Ease of Use

Shot handheld, edited RAW

Controlling the aperture on the lens feels extra pure to me than making these changes on the digital camera physique. That’s one of many causes this lens feels nice to make use of. There’s the off likelihood that newbies would possibly discover the labeled controls daunting, however I don’t suppose too many photographers who don’t know what aperture is are drawn to prime lenses. In any other case, utilizing this lens is actually easy.

This lens isn’t geared up with picture stabilization. With such a large angle and with many our bodies together with stabilization, that’s not a deal-breaker. However, that will nonetheless trigger some pause for photographers who will use this lens primarily to shoot handheld low mild. Nonetheless, on the S5, I used to be in a position to get a little bit of blur out of a waterfall with out utilizing a tripod.

Picture High quality

Photographs from the Sigma 20mm f2 DG DN are sharp and punchy. However, this lens additionally handles distortions moderately properly. It will probably seize some sharp stars, whereas barrel distortion is pretty minimal. Flare is suppressed, however there’s nonetheless a few of it available and when capturing this fashion, and there’s nonetheless some distinction too.


Positive, you may get extra bokeh with an extended lens or an f1.2. However, there’s some good background separation right here. This lens will create essentially the most bokeh when capturing in shut, the place the background softly fades away. The out-of-focus factors of sunshine didn’t have an apparent onion ringing and most had been additionally away from cleaning soap bubbles. Bokeh balls are principally spherical, with the anticipated cat-eye form solely in direction of the perimeters.


Even extensive open, the Sigma 20mm f2 DG DN has a pleasant sharpness to it. It’s sharp, however not clobber-you-over-the-head sharp. There’s a minor softening on the corners —pixel peepers might discover the perimeters of bushes and scenes right here aren’t fairly as sharp. However, there are only a few eventualities the place such a minor softness can be a difficulty.

Lens Character

With such a large angle, the lens has surprisingly little barrel distortion. There’s some slight bending in direction of the perimeters that you simply’ll see when you shortly flip again between a JPEG and a RAW file with out the lens profile utilized. However, it’s pretty minor. You’ll, in fact, get the exaggerated views that include an ultra-wide — not fairly as excessive as a 16mm however not as impartial as a 35mm.

Edited RAW

I used to be additionally in a position to take just a few astrophotography pictures with this lens. The celebrities had been sharp and didn’t endure from many distortions that alter their form.

Photographers can get some flare right here with a little bit effort. Pointed in direction of the solar, the lens could have a comfortable flare of sunshine with just a few small ghosting spots. But, the picture nonetheless retains fairly a little bit of distinction on this situation. It’s not the type of flare that Photoshop artists will recreate later, however there’s a bit to play with right here.

Coloration Rendering

The Sigma 20mm f2 DG DN has solely very minor chromatic aberration. Solely pixel peepers will actually discover it, and you must get in actual shut.

Colours felt only a tad additional from this lens. The sky and greenery had a bit extra punch, but not in an overbearing means. RAW information may simply be manipulated to satisfy a selected coloration imaginative and prescient.

Additional Picture Samples

From day one, the Phoblographer has been big on transparency with our viewers. Nothing from this evaluation is sponsored. Additional, a lot of of us will submit evaluations and present a lot of modifying within the pictures. The issue then turns into that anybody and everybody can do the identical factor. You’re not displaying what the lens can do. So now we have a complete part in our Additional Picture Samples space to indicate off edited and unedited pictures. From this, you may make a call for your self.



Who Ought to Purchase It?

The Sigma 20mm f2 DG DN has a ravishing steel construct and delivers stable pictures. Photographs have stable sharpness, punchy coloration, and even only a little bit of character flare. Distortion is properly managed. To high it off, the steel physique feels actually nice to work with. It’s an honest alternative for astrophotography and landscapes. The $699 worth level makes it a really tempting alternative for extensive pictures. The lens is an honest possibility for photographers on a restricted price range — it’s inexpensive, but the picture high quality doesn’t actually look it.

However, it’s not totally climate sealed. If the Sigma 20mm f2 DG DN was totally weather-sealed, I’d advocate it to numerous photographers (and, if I shot E or L-Mount, would severely take into account choosing it up for myself). The restricted weather-sealing implies that it’s not for photographers who shoot within the rain or in sandy, dusty environments corresponding to seashores. The even cheaper Tamron 20mm f2.8 Di III has higher climate sealing, although there’s vital distortion to are inclined to with that lens. It additionally had just a few autofocus misses.

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