Review Sigma 105mm f/1.4 Art

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A lens design for a 105mm f/1.4 lens with 17 lens elements, incorporating 2 elements of FLD glass and 2 of SLD glass, in 12 groups. A weight above one and a half kilos and a filter size of 105 mm. It is clear that the birth of the Sigma 105 mm f/1.4 Art has been an ambitious project. But when you come home with your first practice shots, you realize that this project has been successful. The Sigma 105 mm f/1.4 Art is an extremely high-quality lens that lets you to create sharp images with a fantastically beautiful bokeh. Lateral and longitudinal chromatic aberration (color defects), distortion and vignetting are all so beautifully limited that you continue to look fascinated at that enormously sharpness in that very narrow area that is sharp at full aperture.

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The Sigma 105 mm f/1.4 Art comes in Canon EF, Nikon F, Sigma and Sony E mount version. In its own house, the 105mm Art has competition from the (cheaper and lighter) 85mm f/1.4 Art and the 135mm f/1.8 Art, both of which we have reviewed before, apart from the difference in focus length, which is often a personal preference of portrait photographers. Although I am not so bothered by it, many portrait photographers find that 85 mm just a bit too short, making the nose too long on a headshot. At 135mm, you stand a bit further away from your subject. In my eyes, the biggest difference in the character of the 105mm f/1.4 Art is at full aperture. Such shots offer you a chance to distinguish yourself from other portrait photographers thanks to the Sigma 105 mm f/1.4 Art.    

Can't decide? Sigma 85 mm f/1.4 Art, 105 mm f/1.4 Art or 135mm f/1.8 Art?

Although the Sigma 105mm f/1.4 Art is not designed for bird photography at all, Birds in Flight (BIF) shots are a good test for the continuous AF speed. If you manage to get close enough, the Sigma 105 mm f/1.4 Art (with Sigma MC11 adapter) + Sony A7R III will not let you down. Even with very little depth of field, it is possible to catch a bird in flight. 

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BUILD AND autofocus

design details 105 14 a018 03

There is 1 switch on the lens, with which you choose between manual or automatic focus. On the top of the lens, there is a small window on which you can read the distance at which you have focused. The relatively large lens hood (made of high-quality carbon fiber to save weight) means, just as with professional bright telephoto lenses, that the lens looks considerably longer than it is. As with the telephoto lens giants, the Sigma 105mm f/1.4 Art has with a tripod collar, which - if you don't have a Manfrotto - can be attached to your tripod without an extra tripod foot. For transport, you turn the lens hood around, but then the wide focusing ring (with a stroke of more than 100 degrees) is completely covered, so that you can no longer manually overrule the AF or focus manually. In comparison with the Nikkor AF-S 105 mm f/1.4E ED, the only lens with similar features currently available for sale, the Sigma is bigger, heavier and considerably less expensive.
The metal mount is fitted with a rubber ring, so that no dust or splash water can penetrate there. Also at the switch and in a few other places, this lens is extra well sealed against dust and splash water. The rear lens element is used to focus and shifts in position. This lens, on a Sony A7R mk III with the Sigma MC11, focused from infinity to 1.5 meters in 711ms. It is possible that time will be a bit shorter if you use this lens without an adapter on an SLR camera. 

Specifications
Sigma 105mm f/1.4 DG HSM Art
Image Stabilization:-
lenses/ groups:17 / 12
length x diameter:132x116mm
filter size:105
Weight:1645
Lens hood:+

WITH OR WITHOUT LENS CORRECTIONS?

Lens manufacturers design lenses with which distortion, color separation and vignetting are not optimally corrected. They assume that lens errors will later be corrected automatically in the camera (for jpg files) or in Lightroom or Photoshop (for RAW files). The advantage of this choice for the manufacturer and consumer is that you can achieve high image quality at relatively low costs, because you do not have to use expensive types of glass to prevent all lens errors. But there are also lenses, usually the more expensive ones, where a manufacturer has gone to extremes to prevent lens errors in the lens design.
CameraStuffReview shows tables and graphs of Imatest results with lens corrections ("in-camera jpg") and without lens corrections ("RAW" outside of Photoshop or Lightroom). This way, you can use the scores that best match your workflow. 

IMAGE QUALITY

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As soon as you examine practice shots made with the Sigma 105mm f/1.4 Art, you understand why Sigma decided to release this lens in addition to the Sigma 85 mm f/1.4 Art and the Sigma 135 mm f/1.8 Art. More than with both other bright Art telephoto lenses, a photographer distinguishes themselves from other photographers thanks to an extremely beautiful background blur/bokeh. Other strengths include the high resolution across the entire image at full aperture, 

JPGREZZ

Distortion (-0.09%), and lateral chromatic aberration that is actually absent. Color bokeh (longitudinal aberrations) is remarkably little visible even at full aperture. For a bright lens, which is usually plagued by color bokeh at full aperture, this is a remarkably good result. Without lens corrections, the vignetting was -1.3 stops at full aperture. Thanks to automatic corrections in-camera or in Lightroom or Photoshop, only half a stop remained. These are very good achievements for a lens test on a full-frame sensor, where we regularly encounter 2 stops of vignetting and that even at smaller apertures than f/1.4.

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ConclusiON: REVIEW Sigma 105mm f/1.4 Art + Sigma MC11 @ Sony A7R III

Use the Lens Comparison or look in our list of reviewed lenses to compare this lens with other lenses.

WYSIWYG score: This table shows the performance of this lens if you save the files in the camera as jpg, with all available in-camera lens corrections applied. If you open RAW files in Photshop/Lightroom and use lens correction profiles, this is the score that most closely matches the image quality of your shots. This score gives you for this lens/test camera combination: "What you see is what you get".


Focal Length
mm @ FF
Total score
Resolution
lat. C.A.
Vignetting
Distortion
AF accur.
AF speed

105
105
9.8
9.4
9.4
8.4
9.8
9
8

Pure RAW score: This table shows the performance of this lens without lens corrections. This score approaches the intrinsic quality of the combination of lens and test camera. If you use lens correction profiles in Photoshop or Lightroom to convert RAW files, then the RAW scores for distortion, vignetting and chromatic aberration are even better.


Focal Length
mm @ FF
Total score
Resolution
lat. C.A.
Vignetting
Distortion
AF accur.
AF speed

105
105
9.9
9.4
9.6
8.5
9.5
9
8

PROS

  • Only 105mm f/1.4 on the market for Sony or Canon cameras
  • Fantastic image quality
  • Fantastic build quality
  • Sealed against dust and splash water
  • Included tripod collar and nicely built (carbon fiber!) lens hood
  • Beautiful bokeh
  • Accurate AF
  • Optional USB dock for firmware updates and more
  • Optional mount conversion service

CONS

  • Big and heavy
  • 105mm filter diameter
  • No built-in image stabilization

Sigma 105mm f/1.4 Art: Racehorse without equal.

When reading on-line tests and watching YouTube reviews, the size and weight are the first things that are discussed. Yet those were surprisingly little trouble. Maybe that was because we used a relatively small and light camera (Sony A7R III) for the test. And this is not a lens to hang around your neck all day. And we didn't do that. The dimensions and the weight of this lens are not without reason: thanks to the big lens surface, the vignetting is minimized, so that compared with bright 105mm lenses from other brands, you will have less cat's eye bokeh. A modern lens design with high-quality types of glass ensures a high level of sharpness out to the corners. Even at full aperture. That creates unique images if you succeed in placing the focus in exactly the right place. At both full aperture and after stopping down two stops, the Sigma 105 mm f/1.4 Art gave the highest scores for our Imatest resolution measurements (both in the center and in the corners) of all lenses with the field of view of a lens with a focal point between 90 and 125mm that we have tested. Because bokeh is beautiful, but sharpness is too!

Jop Steenhof de Jong
Author: Jop Steenhof de Jong
Photography has been a hobby of mine for many years. For me, it's about the joy of creating. I like to find and share knowledge in depth topics again. After years of having fun with contributions made to the Dutch magazine "Camera Magazine", I test now with at least as much pleasure for CameraStuffReview.

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