Sigma 
24-70mm F/2.8 DG DN Sony Review
INTRODUCTION
Hello my friends, today I'm here today to talk you about another lens, I think the most used lens in photography, is considered the most versatile zoom lens, is a lens that is used in Landscape, cityscape, street photography, weddings, portrait, sports, I think used in almost everything.
When i I decided to experiment the world of mirrorless, I also had to choose a zoom lens that could satisfy a wide range of zoom, and again after several analyses I bet new lens of sigma,i bought the  24 - 70 F2.8 art, another redesigned lens for full frame mirrorless cameras. Other big benefits is that Sigma is half price the price of Sony, That is not behind the quality of Sony.
Once again I can assure you that I do not regret  of this bet, as you will be able to see in the next review, thay this lens is superb, present us an excellent quality.
This is my wholehearted honest review of this lens, I have not received any gifts or payment for writing this review. I buyed this Lens.
ABOUT SIGMA

Sigma Corporation is a Japanese company,that dedicates to manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai, Fukushima, Japan. Although Sigma produces several camera models, the company is best known for producing high-quality lenses.
Sigma products lens with mount to camerasCanon, Nikon, Pentax, Sony, Olympus and Panasonic, as well as their own cameras. 
The company was founded in 1961 by Michihiro Yamaki, who was Sigma's CEO until his death at age 78 in 2012, now a day the CEO is Kazuto Yamaki.
Since 1961. Sigma has worked towards a single, simple goal: To imagine, and develop, the technologies that will allow the attainment of the perfect image. It’s a commitment they have made, and honored since day one. It’s evident that their  collaborative design was a  process that unites R&D, manufacturing, marketing, sales, and service. It’s evident in their standards—above and beyond industry norms—requiring 100% of their lenses be analyzed by their proprietary ultra-high definition sensors and approved before leaving our factory.
And its evident in their final products, built with premium materials, and known worldwide for quality and performance. 
All of SIGMA’s products are created in one single place, our Aizu factory, and then reach our customers all around the world. In this video, we focus on the people that create our products, the people that use them, and the environments that surround them. Scene by scene, we introduce some of our Aizu employees as well as their families, the beautiful nature of the Aizu region, and artists of different fields from all around the world.
It is our goal to match the passion driving artists to create new works with our own passion towards our products. With this video, we would like to present both an essence of our philosophy as well as the showcase the creative fervor of everyone who helped create it. 
Photography is all we do. And it’s all we’ve done. So you can rest assured that it’s something we know extensively and care deeply about.
PACKAGING AND UNBOXING

As been usual in Sigma lens, the lens came in a  Sigma white box, i think they could start to think to change their image, a new and modern one.
After having the lens in my hands for a few minutes, I liked the lens, But the first thing I felt, was that the lens seemed to me a bit big and heavy.
Inside the box you could find:
- Lens
- Lens Bag
- Front Cap
- Rear Cap
- 2-Years Warranty
- 5-Years Portugal Warranty Extension
DESCRIPTION

The Sigma 24-70mm F/2.8 DG DN Art is other brother brother of the Sigma 14-24 mm F2.8 DG HSM Art. First Nikon/Canon creations, then Sony/Leica, dlsr then mirrorless. The difference is in the letters: DN.  they lauch the 12-24mm F/2.8, now design the the 24-70 mmF/2.8.
There are a couple of notable features in this lens that i ppreciate: firstly, the minimum focusing distance of 18 cm is remarkable. Lighter than Sony and a lot cheaper.
Talking about the sharpness, for me this lens is superb, with impressive performance at all apertures.


- LOW DISPERSION 
Six Special Low Dispersion (SLD) elements and two F Low Dispersion (FLD) element markedly reduce chromatic aberrations and color fringing throughout the zoom range for improved clarity and color accuracy. 
- MULTI LAYER COATING 
A Super Multi-Layer Coating combined with a Nano Porous Coating has been applied to lens elements in order to minimize lens flare and ghosting .The front lens element has also been treated with a water- and oil-repellent coating to benefit working in wet conditions .
- QUICK AF SYSTEM
This lens is equiped with auto focus system with a smooth motor, and with a high speed autofocusing.
- CONSTANT APERTURE 
The constant f/2.8 maximum aperture helpsa better control over depth of field. 
- AF LOCK
Built-in Autofocus-Lock (AFL) button can be assigned additional functions.
- 11 BLADES DIAPHRAGM 
Rounded eleven-blade diaphragm contributes to a smooth  bokeh quality. 
- WEATHER RESISTANT
Weather-resistant construction with a brass bayonet that affords improved mounting accuracy and rigidity.
SPECIFICATIONS
- Focal Length: 24 to 70mm;
- Maximum Aperture: F/2.8;
- Minimum Aperture: F/22;
- Lens Mount: Sony E;
- Format Compatibility: Full-Frame or Aps-C;
- Angle of View: 84.1° to 34.3°;
- Minimum Focus Distance: 18 cm;
- Maximum Magnification: 0.34x;
- Optical Design: 19 Elements in 15 Groups;
- Diaphragm Blades: 11 Rounded;
- Focus Type: Autofocus;
- Image Stabilization: No;
- Filter Size: 82 mm (Front);
- Dimensions (ø x L):  87.8 x 122.9 mm;
- Weight: 835 g;
- Package Weight: 1.35 kg;
- Box Dimensions (HxWxD): 16 x 18 x 19 cm. 
Features


1- BILD CONSTRUCTION AND MATERIALS

Sigma made a awsome work with the design of this lens, the build quality of the Sigma 14-24mm F/2.8 DG DN Art is at a top level. 
Sigma says that this lens is dust and splash proof. If we look at the brightness and the zoom range.
In the part of the optical construction this lens came with 19 elements positioned in 15 groups.  You get one low dispersion FLD element made of glass with properties similar to fluorite, four low dispersion SLD glass elements, two aspherical elements and one element which.
Other feature I love, is the number of  diaphragm blades, this lens came wit 11 blades.
Other awsome feature is the closest focus range it’s 18 cm, that helps in awsome boken effect. 
2- EASY TO USE
Weighing in at 830 grams and measuring nearly 12.5cm in length, the Sigma 24-70mm f2.8 DG DN Art is certainly a big and heavy lens given its focal length, although it's actually slightly lighter and shorter than its main rival, the Sony FE 24-70mm F2.8 GM (886g and 13.6cms).
The Sigma 24-70mm f2.8 DG DN Art lens has a generously sized focus ring, which is ridged for easier grip. There are no hard stops at the ends of the range, making it harder to set focus at infinity. Filters users  should be pleased that the 82mm filter.
3-  FOUS PERFORMANCE
The autofocus of the Sigma 24-70 mm F/2.8 is clearly optimized for mirrorless cameras and worked well in my tests. 
The autofocus in my Sony A7R4 camera is almost noiseless and confirming the focus takes from 0.3 to 0.5 of a second,  good job Sigma even in low light condictions.

Sigma have the Auto Focus Lock (AFL) button that can also be re-configured to assign various functions to the lens barrel.
4 - DISTORTION
One slight disappointment is that, 24-70 mm Art is essentially a ‘zero distortion’ lens, this one certainly isn’t. Barrel distortion can be quite noticeable in the 24-35 mm sector of the zoom range, the good thing is that in the post processing program it almost all disapear.

Sony A7R4 - 24-70mm, 2.8 - Iso 100, F/8, 1/250, 24mm

Sony A7R4 - 24-70mm, 2.8 - Iso 100, F/8, 1/250, 35mm

Sony A7R4 - 24-70mm, 2.8 - Iso 100, F/8, 1/250, 50mm

Sony A7R4 - 24-70mm, 2.8 - Iso 100, F/8, 1/250, 70mm

5 - SHARPNESS
This lens is very sharp in all frame, in center and in corners, and in all distances.
Congratulations Sigma...

Sony A7R4 - 24-70mm, 2.8 - F/8, Iso 100,  1/250, 24mm

CORNER

24mm
The edges is outstanding through from f/4 to f/16, very soft in F/2.8, with f/22 being adversely affected by diffraction.

Sony A7R4 -24-70mm, 2.8 - Iso 100,  1/250, 24mm

35mm
The edges aren't quite as sharp as the centre, with f/4 to f/11 producing the sharpest results.

Sony A7R4 - 24-70mm, 2.8 - Iso 100,  1/250, 35mm

50mm
The edges aren't quite as sharp as the centre, with f/4 to f/11 producing the sharpest results.

Sony A7R4 -24-70mm, 2.8 - Iso 100,  1/250, 50mm

70mm
The edges aren't quite as sharp as the centre, with f/4 to f/11 producing the sharpest results.

Sony A7R4 -24-70mm, 2.8 - Iso 100,  1/250, 70mm

CENTER

24mm
Centre sharpness is outstanding through from f/2.8 to f/16, with f/22 being adversely affected by diffraction.

Sony A7R4 - 24-70mm, 2.8 - Iso 100,  1/250, 24mm

35mm
Centre sharpness is outstanding through from f/2.8 to f/16, with f/22 being adversely affected by diffraction.

Sony A7R4 - 24-70mm, 2.8 - Iso 100,  1/250, 35mm

50mm
Centre sharpness is outstanding through from f/2.8 to f/16, with f/22 being adversely affected by diffraction.

Sony A7R4 -24-70mm, 2.8 - Iso 100,  1/250, 50mm

70mm
Centre sharpness is outstanding through from f/2.8 to f/16, with f/22 being adversely affected by diffraction.

Sony A7R4 - 24-70mm, 2.8 - Iso 100,  1/250, 70mm

Centre-frame sharpness is outstanding at all focal lengths and apertures. Corner sharpness isn't quite so impressive, but it's consistently good at all apertures, with the only dip being at 24mm at larger apertures.
6 - VIGNETTING
In this lens it's almost null the presence of vignette, I tested in the various focal lengths and different apertures and could not see almost any vignette, only with the aperture almost closed it was noticeable a little vignette easy corrected in pos production.
7 - CHROMATIC ABERRATION
Chromatic aberrations, typically seen as purple or blue fringes along contrasty edges, are not a problem for the Sigma 24-70mm f2.8 DG DN Art, even at the edges of the frame, good thing is that it's well corrected in pos production lens profile correction.

Sony A7R4 - 24-70mm, 2.8 - F/8, Iso 100,  1/250,

8 - FLARE RESISTANCE
Other good feature of this lens is that Sigma 14-24 mm f/2.8 doesn't have any significant problems with chromatic aberration. 
Even at the maximum relative aperture it would be difficult to notice any traces of colouring in out-of-focus areas,thanks to the lens' Super Multi-Layer Coating.
Good work Sigma...
9 - BOKEN
Bokeh is a word used for the out-of-focus areas of a photograph, and is usually described in qualitative terms, such as smooth / creamy / harsh etc. In the Sigma 24-70mm f2.8 DG DN Art lens, Sigma employed an diaphragm with 11 rounded blades, which has resulted in very nice bokeh in my view. 
Awsome work, awsome boken...

Sony A7R4 - 24-70mm 2.8 - F/2.8, Iso 100,  1/250,

10 - MACRO
The Sigma 24-70mm f2.8 DG DN Art isn't claimed to be a macro lens, but it delivers quite good performance if you zoom to 70mm. It has a minimum focusing distance of 18cm / 38cm at 24mm/70mm, and a maximum magnification ratio of 1:4.5 when set to the 70mm focal length.
11 - SUNSTAR EFFECTS
The Sigma 24-70mm f2.8 DG DN Art produces quite nice sunstars when stopped-down to f/16 and f/22.
PRICE VS PERFORMANCE

As the spine of the trinity of fast zooms, the 24-70mm f/2.8 is a lens where you expect to spend a good amount of cash. ​​​​​​​I’m very impressed with the Sigma 24-70 F/2.8 lens. I feel like Sigma is on way for success with these creations for mirrorless, isn't a cheaper lens, but it's cheaper  but it's a half of price of the Sony.
This lens can be buyed at 1250€.
CONCLUSION

The Sigma 24-70mm f/2.8 DG DN ART is a lens that offers G Master-like quality at half the price, and unlike the previous generation Sigma Art lenses, this one is actually smaller and lighter than the G Master equivalent.
This is a reasonably priced that makes you want to take a cheaper quality lens.
Bokeh is awsome in the 24-70mm, and the sharpness and autofocus performance is everything that you’d want. If vignetting and distortion aren’t going to keep you awake at night, there seem few reasons to opt for buying this lens.

WHAT I LIKED
- Superb sharpness and contrast
- Excellent boke
- Super-fast, silent autofocus

CONS
- Little bit big, and heavy for a mirrorless lens
- Noticeable distortion and vignetting when uncorrected


REAL WORLD APPLICATION
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