Users of Sony’s A7-series of full-frame mirrorless cameras are well catered for when it comes to fast prime lenses of the 85mm variety. At the more affordable end of the spectrum there’s the manual-focus Samyang MF 85mm F1.4 MK2 (£359), the Sony FE 85mm f/1.8 (£539) and the Samyang AF 85mm F1.4 FE (£549), while at the premium end there are three stellar examples – the Sigma 85mm F1.4 DG HSM Art (£929), Zeiss Batis 85mm F1.8 (£1129) and Sony FE 85mm F1.4 G Master (£1499). Not exactly a shortage to choose from, so how does Sigma’s latest 85mm prime differ and where does it fit in?

Sigma 85mm F1.4 DG DN Art

The Sigma 85mm F1.4 DG DN Art was paired with the Sony A7 III for our review

Whereas the Sigma 85mm f1.4 DG HSM Art was originally designed for full-frame DSLRs and later adapted for use with mirrorless cameras that use the E-mount and L-mount, the Sigma 85mm F1.4 DG DN Art is developed for full-frame mirrorless cameras from the ground up – denoted by the ‘DN’ initials in its name.

Sigma 85mm F1.4 DG DN Art

The Sigma 85mm F1.4 DG HSM Art (left) and Sigma 85mm F1.4 DG DN Art (right). The new lens is 500g lighter than Sigma’s previous version

Like other Sigma DG DN full-frame mirrorless lenses, of which we’re starting to see a growing number appear, the 85mm F1.4 DG DN stands out in a number of ways from previous Sigma examples and its rivals, which we’ll come onto shortly. We’re not looking at a fast prime that’s only made in Sony E-mount either; it’s also available in L-mount for use with Leica, Sigma and Panasonic full-frame cameras.

Sigma 85mm F1.4 DG DN Art: Features

Compared to the Sigma 85mm f1.4 DG HSM Art, which is one of the largest and heaviest 85mm lenses we’ve tested, Sigma’s latest example is far more compact and discards a vast amount of weight. To be precise, the E-mount version that we were sent for review works out 30mm shorter in length and 500g lighter than Sigma’s previous version. This is a phenomenal weight saving for a lens that promises improved image quality.

Sigma 85mm F1.4 DG DN Art

Aperture settings are clearly marked on the barrel in white and the focus ring is rubberised

Where the Sigma 85mm F1.4 DG HSM Art was made up of 14 elements in 12 groups, this lens features an entirely new optical design encompassing 15 elements in 11 groups. Within this construction are five special low-dispersion (SLD) glass elements, one aspherical element at the rear of the lens group and four high refractive index glass elements to minimise chromatic aberration, flare and ghosting.

Sigma 85mm F1.4 DG DN Art

Here we see the aperture lock switch that can be used to prevent engaging the auto (A) aperture setting accidentally

By making the most of in-camera aberration correction, Sigma has been able to concentrate on the correction of aberrations that are only eliminated by the lens’ optics, which combined with reducing the size of the focus element, allows it to be made smaller. Furthermore, with an emphasis given to the elimination of axial chromatic aberration, Sigma says users can expect sharp images with no colour fringing, even wide-open at f/1.4.

Sigma 85mm F1.4 DG DN Art

The 11 aperture blades can be clearly seen when the lens is viewed from the front

Complimenting the lens construction is a diaphragm with 11 curved blades to give a circular aperture for attractive bokeh. As for autofocus, the stepping motor it uses is intended to keep AF operation fast and silent. It’s designed to work well with both phase-detection and contrast-detection autofocus, and fully supports different manufacturers face/eye/animal detection modes.

Sigma 85mm F1.4 DG DN Art

The lens features a rubber seals in its construction. One of these is found at the rear to prevent moisture creeping past between the camera and lens mount

Elsewhere, the lens features a durable, brass metal mount and is compatible with Sigma’s USB dock UD-11 that’s sold separately for L-mount only. It has a minimum focus distance of 85cm and you’re presented with all the accessories you expect in the box, including a bowl-shaped lens hood, a padded case and front and back caps.

Sigma 85mm F1.4 DG DN Art: Build and Handling

Touching on the way the lens handles, it has entirely different handling characteristics to the 85mm F1.4 DG HSM Art. Unlike its predecessor that added over a kilogram to the weight of the camera, often upsetting the balance to the point it made setups feel very front heavy, this is no longer the case.

Sigma 85mm F1.4 DG DN Art

The AFL button that’s located below the AF/MF switch is easy to find from behind the camera

It balances superbly on full-frame mirrorless cameras like the Sony A7 III I paired it with and lets you to shoot single-handed with no discomfort. Having the option to shoot without always supporting the lens beneath the barrel will appeal to portrait and wedding photographers who often find themselves offering direction with their left hand. Better than this is the way it lets you walk around and shoot without feeling like you’re weighed down.

Sigma 85mm F1.4 DG DN Art

A side view showing the length of the lens on the Sony A7 III with the hood attached

Build quality meets the high standards we’ve come to expect of Sigma’s Art lenses. The construction of the barrel is a blend of precision-engineered metal and thermally stable composite (TSC), with its rubberised focus ring offering excellent precision and fluidity when focusing manually.

Sigma 85mm F1.4 DG DN Art

The manual focus ring is rubberised and rotates very smoothly but doesn’t feature end-stops

The transition between choosing whether the aperture ring clicks or doesn’t click from the flick of a switch is seamless. You can choose to receive feedback of the aperture changing every 1/3EV stop by leaving the click switch set to on, or if you’d prefer to adjust the aperture ring smoothly and silently, such as when recording video, it can be switched to off.

Sigma 85mm F1.4 DG DN Art

Users get the choice of being able to adjust the aperture directly from the lens or from the camera’s command dial when the aperture ring is set to its A setting

To prevent accidentally engaging the auto (A) aperture setting, which allows you to adjust the aperture from the camera rather than the lens, Sigma has added an aperture lock switch. It can also be engaged when auto (A) is selected too, preventing the aperture being accidentally changed by knocking the aperture ring.

Sigma 85mm F1.4 DG DN Art

A release button has to be used to release the hood from the lens. Note the hoods rubberised texture towards the rear that lets you get a good grip of it when your hands are wet

Having good weather resistance is crucial on a lens that’s likely to see plenty of use outdoors as well as indoors. The dust-and splash-proof structure features seals at strategic points in its construction, including a rubber seal around the perimeter of the metal mount that compresses against the mount on the camera. The autofocus lock (AFL) button is also weather sealed and exhibits a subtle click when pressed.

Sigma 85mm F1.4 DG DN Art: Autofocus

As we’ve witnessed on other Sigma DG DN lenses, users get a focus lock (AFL) button just below the AF/MF switch that can be setup from compatible camera’s menus to perform various different functions. Manual focusing is fly-by-wire rather than being mechanically coupled, but as already mentioned, users get precise focusing adjustment when the focus ring is rotated slowly.

Sigma 85mm F1.4 DG DN Art

The auto focus lock (AFL) button can be setup from the menu to perform various functions

The autofocus performance is good, with signs of mild hunting only being observed when it was asked to focus from near to far and vice versa in challenging low-light scenes. In brighter conditions the lens locked onto subject’s eyes with little fuss, aided by the effective real-time Eye-AF on the Sony A7 III.

I managed to achieve a consistently high number of sharp shots wide-open at f/1.4 during testing and the faint whirring it makes as it focuses didn’t disturb audio in outdoor movie recordings, though it was picked by the camera’s internal microphone up in a silent room.

Sigma 85mm F1.4 DG DN Art: Performance

To gauge how the lens performs optically, I requested that it be supplied with the older Sigma 85mm f1.4 DG HSM Art in E-mount so I could compare identical shots taken across the aperture range before meticulously examining real-world samples.

Sony A7 III, Sigma 85mm F1.4 DG DN Art, 1/800sec at f/1.4, ISO 100 (With thanks to the Spa Valley Railway)

Comparing images revealed it’s ever so slightly sharper than its predecessor in the centre at f/1.4. Sharpness at the edge of the frame is remarkably impressive wide-open, though you can expect corners to get even sharper when it’s stopped down.

Sony A7 III, Sigma 85mm F1.4 DG DN Art, 1/1250sec at f/1.4, ISO 100 (With thanks to the Spa Valley Railway)

Studying shots taken between f/1.4 to f/16 tells us the sweet spot of edge-to-edge sharpness is located between f/4-5.6, with a high level of sharpness also being recorded at f/8. The introduction of diffraction takes the edge off sharpness a little when it’s used beyond f/11 and at its minimum of f/16.

Sony A7 III, Sigma 85mm F1.4 DG DN Art, 1/1250sec at f/1.4, ISO 100 (With thanks to the Spa Valley Railway)

The built-in lens profile that’s applied to Raw files automatically does a fine job of correcting chromatic aberration to the point I didn’t witness any sign of nasty colour fringing, not even along any high-contrast edges of shots taken at the maximum aperture.

Sony A7 III, Sigma 85mm F1.4 DG DN Art, 1/1600sec at f/1.4, ISO 100

Users will want to ensure their in-camera lens compensation is turned on, though vignetting does remain prominent when the lens is used at wider apertures. Corner shading is tasteful rather than garish and diminishes as it’s stopped down to f/2.8, barely traceable by f/4.

Sony A7 III, Sigma 85mm F1.4 DG DN Art, 1/125sec at f/4, ISO 100 (pincushion distortion uncorrected)

Sony A7 III, Sigma 85mm F1.4 DG DN Art, 1/125sec at f/4, ISO 100 (pincushion distortion corrected in Adobe Camera Raw)

Interestingly my comparisons revealed the lens displays greater pincushion distortion than Sigma’s 85mm f1.4 DG HSM Art so some users may want to apply a small amount of manual distortion correction in post.

Sigma 85mm F1.4 DG DN Art: Verdict

I’ve tested some phenomenally impressive prime lenses over the last couple of years, but the Sigma 85mm F1.4 DG DN Art stands out as one, if not the best, I’ve used.

Sigma 85mm F1.4 DG DN Art

The lens looks smart when it’s paired with Sony’s full-frame A7-series mirrorless cameras

Though the optical quality of its predecessor remains excellent to this day, its bulk and colossal weight isn’t complimentary to full-frame mirrorless cameras, which is where other manufacturers examples have presented an advantage up until now.

By designing the lens from scratch and tailoring it for mirrorless users who desire smaller, lighter lenses, Sigma has created an absolute gem of lens that delivers astonishingly impressive image quality, fantastic lens-based aperture control and complimentary handling all in one.

Sigma 85mm F1.4 DG DN Art

Note the white background behind the AF/MF switch that offers a visual indication that lens is set to autofocus when working in low-light situations

Better still, it offers all the desirable features you’ll find on its more expensive Sony FE 85mm F1.4 GM rival for £500 less. Take all that it offers for the money into consideration and there’s no disputing that it’s currently the best value for money premium 85mm f/1.4 lens you can buy under £1000.

It’s a must-have for E-mount or L-mount users who love to shoot portraiture, weddings or take a documentary style approach to their work.

All that’s left to say is that it sets a new gold standard in portrait lenses for mirrorless cameras and I’m hopeful it won’t be too long before we see Sigma release versions in Canon RF and Nikon Z-mount.

Sigma 85mm F1.4 DG DN Art: Specification