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 f2.8 DG DN Art lens is a pretty straightforward lens to use for both a novice and a professional. There is a big zoom ring, a manual focus ring that you will probably never use, and an AF/MF switch. It’s a lens designed primarily for autofocus, and it works well in that respect. There is also a programmable button on the side, which I never set to do anything (and which I believe anyone I know sets to do anything either). By and large, there’s nothing bad to say about the Sigma 24-70mm f2.8 DG DN Art lens’s ease of use if you’re an experienced photographer who understands that gear comes second to your talents and abilities as a photographer.

There are a couple of notable features in this lens that i ppreciate: firstly, the minimum focusing distance of 18 cm is remarkable, putting both of its competitors to shame. Secondly, it’s about half an inch   and more than five percent lighter than the Sony. While these aren’t dramatic savings, this is the type of lens that spends a huge amount of time attached to many photographers’ cameras, so those small differences may add up. As i mentioned before half price of the Sony lens.


Talking about the sharpness, this lens is superb, with impressive performance at all apertures and across the frame. As you’d expect, f/4 is sharper than f/2.8, and f/5.6 is sharper still.
Autofocus is excellent, snapping to subjects rapidly and in near silence, coping well with low-light, low-contrast, and back-lit conditions.

- CONSTANT APERTURE
Constant f/2.8 maximum aperture is well-suited for working in available light conditions and also provides greater control over depth of field when using shallow depth of field techniques.

- LOW DISPERSION
Six F Low Dispersion (FLD) and two Special Low Dispersion (SLD) elements markedly reduce chromatic aberrations and color fringing throughout the zoom range for improved clarity and color accuracy.

- ASPHERICAL ELEMENTS
Three aspherical elements control spherical aberrations and distortion for increased sharpness and accurate rendering.

- AF LOCK BUTTON
Integrated AF-L button can be programmed to adjust various shooting settings and the lens also features a dedicated AF/MF switch and a zoom lock switch to prevent the barrel from accidentally extended.

- 11 BLADES DIAPHRAGM
Rounded 11-blade diaphragm contributes to a pleasing 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
The Build quality of  the Sigma it's like a   professional-grade, there is something about the feel of Sigma’s Art series that is appealing. Maybe it’s the matte black finish or the monochromatic clean look of the lens in general.
Further switches and buttons include an AF/MF toggle switch and an AF-L (autofocus lock) button, which can be customised to carry out different functions, depending on camera type and model. The zoom and focus rings themselves are reversed. The lens comes with a flower-shaped lens hood. Immediately behind that, you find the broad zoom ring. Behind that, slightly closer to the camera, is the narrower focus ring.There’s a zoom lock switch, although our review sample didn’t suffer from any zoom creep whatsoever, and a locking button on the hood.  The Sigma 24-70 mm F2.8 Art is weatherproof and has a rubber seal on the mount. That’s how it should be for a lens in this class.
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 focus performance on the Sigma 24-70mm f/2.8 DG DN ART is very respectable, this lenscomes equipped with the same ‘Hypersonic AF’ technology.
This 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.

In low light is also surprisingly good for a third party Sigma lens.
To date, I’ve found that eye and face autofocus is flawless, even in backlit conditions.

Based on my experiences with the Sigma and now the 24-70mm f/2.8, it seems like Sigma is improving their AF performance substantially with every release. I don’t think it will be long before the performance advantages offered by the Sony GM lenses become a thing of the past.
There is a dedicated Auto Focus Lock (AFL) button that can also be re-configured to assign various functions to the lens barrel.
4 - DISTORTION
The Sigma 24-70mm f/2.8 DG DN Art produces moderate barrel distortion at 24mm, transitioning to pincushion at 50mm and beyond. The degree of distortion is enough to be visible when shooting geometric subjects, but is only obvious at 24mm, and it's not difficult to correct this in raw processing software.

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

In the pos productions, when you  make the lens profile, the app almost correct all the distortion
5 - SHARPNESS

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.

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

In the pos productions, when you  make the lens profile, the app almost correct all the chromatic aberrations
8 - FLARE RESISTANCE
Flare is a typical problem with wider-angle lenses, so we were curious to find out how the Sigma 24-70mm f2.8 DG DN Art fared in this respect.
As these examples shows the lens is is a little susceptible to flare when shooting directly into the sun, even with the supplied lens hood fitted, but overall it is well controlled thanks to the lens' Super Multi-Layer Coating.
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 iris diaphragm with 11 rounded blades, which has resulted in very nice bokeh in our view. We do realise, however, that bokeh evaluation is subjective, so we've included several 100% crops for your perusal.

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 nonetheless 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. The following example demonstrates how close you can get to your subject.
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 brick that makes you want to take it with you everywhere, despite its size. Bokeh is surprisingly good for a 24-70mm, and the sharpness and autofocus performance is everything that you’d want from a workhorse that sits at the center of your trinity. 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
(fotos) 

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