When building your Sony lens collection, you will inevitably have to decide between the Sigma 28-70mm f/2.8 DG DN and Tamron 28-75mm f/2.8 Di III G2 lenses. Both offer impressive optics and fast apertures in a similar focal range.

However, they have key differences that may make one a better choice over the other for your needs. As you compare these lenses, consider factors like sharpness, bokeh, size and weight, weather sealing, and price. Analyze sample images and read in-depth reviews to understand their real-world performance.

Weigh your photography priorities and shooting style to determine if your best option is the versatile Sigma or the compact Tamron. With an informed decision, you can confidently select and enjoy the ideal 28-70mm f/2.8 lens for your Sony mirrorless system.

Introducing the Sigma 28-70mm F/2.8 DG DN and Tamron 28-75mm F/2.8 Di III G2

Features

Both lenses offer a fast f/2.8 maximum aperture throughout the zoom range, providing good low light performance and bokeh. They contain a mix of high and extra-low dispersion elements to reduce chromatic aberrations. Their minimum focus distance allows for close-up shots.

Compatibility

These lenses are compatible with full-frame E-mount Sony mirrorless cameras like the a7 III and a7R IV. They can also be used on APS-C E-mount cameras where they will provide a 42-105mm and 42-112mm equivalent focal length respectively.

Size and Weight

The Sigma 28-70mm is slightly more compact and lighter, weighing in at 19.2 ounces. The Tamron is 22.9 ounces. For travel or all-day shooting, the size and weight difference may be a consideration.

Optical Performance

Both lenses produce images with excellent sharpness, even wide open, and low distortion. The Tamron has slightly better edge-to-edge sharpness. Bokeh is pleasing on both. The Tamron may have a slight edge for astrophotography due to less comatic aberration.

Price

The Tamron typically costs $100-$200 more than the Sigma. For the performance, either lens is a great value for Sony shooters looking for a high-quality standard zoom.

In summary, you can't go wrong with either the Sigma 28-70mm f/2.8 or Tamron 28-75mm f/2.8 G2. Evaluate your specific needs and budget to determine the best choice for your Sony camera kit.

Main Specs Face-Off: How the Two Lenses Compare

When comparing the Sigma 28-70mm and Tamron 28-75mm G2, you'll want to consider their main specifications and features to determine which best suits your needs.

The Sigma lens has a slightly shorter focal range at 28-70mm versus 28-75mm on the Tamron, giving the latter a bit more reach on the telephoto end. Both offer a fast constant maximum aperture of f/2.8, allowing for shallow depth of field and solid low-light performance.

In terms of size and weight, the Sigma is more compact at 4.7 inches long and 19.2 ounces, while the Tamron is 5.2 inches long and weighs 1 pound 1.2 ounces. For many, the lighter, smaller form-factor of the Sigma may be preferable for travel and all-day shooting.

For image quality, both lenses produce sharp results with fast, accurate autofocus. The Tamron has a slight edge in optical performance with less chromatic aberration, though differences will only be noticeable at large print sizes.

Build quality is comparable, with moisture-resistant construction on both lenses suitable for use in light rain. The Tamron does have a more robust feeling with an all-metal body, versus composite materials on the Sigma.

Other useful features include Tamron's Vibration Compensation (VC) image stabilization which provides up to 5 stops of compensation versus no stabilization on the Sigma. The Tamron also has an Arca-type compatible tripod mount for direct attachment to tripod heads.

In the end, while specifications are similar, the final choice comes down to priorities. If optical performance, reach, and stabilization are most important, the Tamron 28-75mm f/2.8 is an excellent option. If budget and a compact, lightweight lens are higher concerns, the Sigma 28-70mm f/2.8 will work very well and save you money, despite lacking some of the Tamron's advanced features. Either way, you can't go wrong - it comes down to the right lens for your needs.

Image Quality: Sharpness, Colors, and Bokeh

When evaluating image quality between the Sigma 28-70mm and Tamron 28-75mm G2, several factors should be considered: sharpness, color rendering, and bokeh.

Sharpness

The sharpness of a lens refers to its ability to render fine details clearly. Both the Sigma and Tamron offer exceptional sharpness for their price, with the Sigma having a slight edge. At wider apertures, the Sigma displays higher resolution across the frame, while the Tamron shows some softness in the corners. At smaller apertures, sharpness becomes comparable. For most shooting, either lens will provide more than adequate sharpness.

Color Rendering

The color rendering, also known as color reproduction, determines how accurately a lens depicts the colors of a scene. The Tamron produces colors that are vibrant yet natural-looking. The Sigma yields a warmer color tone that may require white balance adjustment in some conditions. For portraits, the Tamron's color rendering may be preferable. For landscapes, either lens performs well, with personal preference between a warmer or cooler tone being the determining factor.

Bokeh

Bokeh refers to the quality of the out-of-focus areas in an image. A lens with pleasing bokeh will produce soft, creamy out-of-focus highlights. The Tamron has a slight edge over the Sigma for bokeh. At wider apertures, the Tamron produces rounder out-of-focus highlights, while the Sigma exhibits a polygonal shape. The difference is minor, however, and bokeh remains subjective. For most, the bokeh of either lens will be more than satisfactory.

In summary, you can expect superlative image quality from either the Sigma 28-70mm or Tamron 28-75mm G2. When evaluating factors like sharpness, color, and bokeh, the differences are minor. For any type of photography, you would be hard-pressed to choose one over the other based solely on image quality. Other factors like price, size, and handling may be more significant in determining which lens is the best choice for your needs.

Focusing Performance and Accuracy

The focusing performance of a lens plays an important role in achieving sharp and crisp images. Both the Sigma 28-70mm and Tamron 28-75mm G2 lenses utilize fast, quiet autofocus motors to quickly lock onto subjects. However, the Tamron lens has a slight advantage with its ring-type ultrasonic motor (USD) which is optimized for Sony E-mount cameras. This results in faster, more accurate autofocus, especially when tracking moving subjects or in low light conditions.

The Tamron 28-75mm G2 also features a newly developed autofocus algorithm and controller which helps improve autofocus speed and precision. It has a minimum focus distance of just 0.38m (15 inches) across the entire zoom range, allowing you to get up close to small subjects. The Sigma lens has a slightly longer minimum focus distance of 0.37-0.45m (15.4-18.1 inches) depending on the focal length.

Both lenses support autofocus with Sony's Real-time Eye AF and Real-time Animal Eye AF for precise focusing on a subject's eye. However, the Tamron 28-75mm G2 may have a slight advantage for eye and animal eye AF due to its more advanced autofocus system which is optimized for Sony cameras.

In terms of manual focusing, the Tamron 28-75mm G2 features a smooth-operating focus ring that provides a natural manual focusing feel. The focus ring on the Sigma lens feels a bit looser in comparison. The Tamron also has a focus lock button that can be customized to lock focus at your desired focal length. This can be useful when recomposing a shot after focusing on your subject.

Overall, while both lenses deliver fast, quiet autofocus suitable for most types of photography, the Tamron 28-75mm G2 has a slight edge with its more advanced ultrasonic motor and focus system optimized for Sony cameras. This results in faster, more accurate autofocus performance, especially when tracking moving subjects or in low light. For these reasons, the Tamron 28-75mm G2 may be the better choice if autofocus speed and accuracy are high priorities.

Build Quality and Handling

When analyzing the build quality and handling of the Sigma 28-70mm F2.8 DG DN vs the Tamron 28-75mm F2.8 Di III RXD, there are a few factors to consider regarding the construction and feel of each lens.

The Sigma 28-70mm F2.8 DG DN features a sleek, minimalist design with an all-metal barrel and mount. It has a solid, dense feel that provides confidence in its durability. The lens is equipped with a weather-sealed construction to protect against dust and moisture. It also includes a control ring that can be customized for various functions like focus or exposure compensation. The lens offers a well-balanced weight distribution for comfortable handling.

Similarly, the Tamron 28-75mm F2.8 Di III RXD possesses an all-metal exterior with weather-resistant sealing. It has a sturdy, robust feel indicative of a premium product. The lens incorporates an MF focus ring as well as a zoom lock switch to prevent unwanted extension of the barrel during transport. An additional benefit is its lighter weight compared to the Sigma, making it ideal for travel and all-day use. However, some users note that the zoom ring can feel slightly loose.

In summary, both lenses demonstrate exceptional build quality and handling for their price points. The Sigma edges out the Tamron in terms of premium feel, while the Tamron’s lower weight provides superior portability. For the best of both worlds, the Sigma 28-70mm F2.8 DG DN represents the optimal balance of high-end design and manageable size. Overall, photographers can feel confident in the construction of either lens to capture professional images for years to come.

Features and Customization Options

When choosing between the Sigma 28-70mm f/2.8 DG DN Contemporary and Tamron 28-75mm f/2.8 Di III RXD G2, several features and options for customization should be considered based on your needs and shooting style.

Focal Length

The focal length of 28-70mm on the Sigma and 28-75mm on the Tamron offers a useful range for many types of photography, including landscapes, portraits, events, and general use. The Tamron has a slightly longer maximum focal length, which could be advantageous for tighter framing. However, the difference of 5mm may not be significant enough for most users to make a choice based primarily on focal length alone.

Aperture

Both lenses have a maximum constant aperture of f/2.8, allowing for shallow depth of field and shooting in low light. The wide aperture provides the ability to isolate your subject by blurring the background. The f/2.8 aperture is ideal for professional use and delivers excellent performance, especially given the lenses’ affordable price points.

Focusing

The Tamron utilizes a ring-type ultrasonic motor for fast, quiet autofocusing. It features a minimum focus distance of 0.19m and maximum magnification of 0.34x. The Sigma also has a hypersonic motor and minimum focus of 0.37m, with 0.34x magnification. Either would work well, but the Tamron may have a slight edge in autofocus speed and close-focusing ability.

Weather Sealing

The Tamron has a moisture-resistant construction, which can be useful when shooting in adverse weather conditions. The Sigma does not have official weather sealing, so it may not withstand dust and moisture as well. Weather sealing is not essential for most users but is a feature to consider if you frequently shoot in dusty or wet environments.

In summary, while the Tamron 28-75mm f/2.8 Di III RXD G2 has some advantages like weather sealing and close-focus ability, either lens would serve as an excellent choice for Sony mirrorless camera owners looking for a fast, mid-range zoom. The final decision will come down to your specific needs, priorities, and budget.

Which Lens Performs Better for Different Genres?

Portraiture

Both lenses work well for portraiture, but the Sigma 28-70mm may have a slight edge. Its focal length range is ideal for tight headshots and full-length portraits, while its fast f/2.8 aperture produces a shallow depth of field for dreamy bokeh. The lens’ close-focusing ability also allows you to get detailed close-up shots. However, the Tamron 28-75mm G2 would also be an excellent choice for portraiture with comparable image quality and bokeh.

Landscape and Architecture

For landscape and architecture photography, either lens would suit your needs nicely. Their wide-angle to short-telephoto focal length ranges are versatile enough to capture sweeping vistas as well as tighter details. Both offer sharp optics that render fine details well across the frame. The Tamron’s slightly wider 28mm focal length may give you a bit more flexibility in some situations, but the difference is minor. Ultimately, both lenses would work great for capturing city scenes, natural landscapes or building details.

Street and Travel

If you frequently shoot street photography, the Tamron 28-75mm G2 would probably be your best bet. Its lighter weight and more compact size make it ideal for walking around and capturing spontaneous moments. While the Sigma 28-70mm produces comparable image quality, its larger size and heavier weight may make it less convenient for extended handheld use, especially when traveling. However, its weather sealing does provide protection from the elements if that is a concern.

Low Light and Action

For low light or action photography, the Sigma 28-70mm’s faster f/2.8 aperture gives it a advantage. The ability to use faster shutter speeds to freeze motion or achieve correct exposure in dim lighting conditions provides more flexibility. The Tamron’s maximum aperture of f/2.8 is still quite capable, but in very low light or fast action scenarios, the Sigma’s wider aperture could make a difference. If shooting sports, wildlife or events in challenging lighting is important, the Sigma may be the preferable choice.

In summary, while both lenses would work well for a variety of genres, the Sigma 28-70mm f/2.8 DG DN lens may have some advantages for low light, action and portraiture. For landscape, architecture, street or travel photography, either lens would be an excellent, versatile choice for your Sony camera system.

The Verdict: Which Lens Should You Buy for Your Sony Camera?

When deciding between the Sigma 28-70mm and the Tamron 28-75mm G2 lens for your Sony camera, there are several factors to consider based on your needs and shooting style.

The Sigma 28-70mm lens is an excellent choice if compactness and affordability are priorities. It is the smallest and lightest full-frame zoom lens for Sony E-mount and offers superb optical quality for its size. The Sigma is also the more budget-friendly option, costing nearly $200 less than the Tamron. However, its maximum focal length of 70mm may be limiting for some types of photography.

On the other hand, the Tamron 28-75mm G2 lens provides a useful extended zoom range, reaching up to 75mm. For an additional $200, the Tamron offers weather sealing and a more durable build quality that can withstand demanding conditions. The Tamron 28-75mm G2 receives very high marks for its fast, precise autofocus and sharp image quality throughout the zoom range.

In summary, if you are looking for an affordable, compact zoom lens for everyday shooting, the Sigma 28-70mm would likely suit your needs well. For the enthusiast or professional photographer who requires additional telephoto reach and a more robust, weather-sealed design, the Tamron 28-75mm G2 may be worth the extra investment. Either of these lenses would make an excellent addition to your Sony full-frame mirrorless camera.

The choice ultimately comes down to your priorities and how much you are willing to spend. Both the Sigma 28-70mm and Tamron 28-75mm G2 are highly-rated, well-built lenses that can produce professional results. Evaluate what specifications and features matter most for your photography and go with the option that meets your needs.

FAQs: Answering Common Questions on the Sigma 28-70mm vs Tamron 28-75mm G2

Is the Sigma 28-70mm sharp?

The Sigma 28-70mm is extremely sharp, especially when shooting wide open at f/2.8. Sharpness is one of the major strengths of this lens. The aspherical elements and three SLD glass elements help produce crisp images with high contrast. The sharpness is very consistent throughout the zoom range as well. For the price, the Sigma 28-70mm offers outstanding sharpness that will not disappoint.

How does the Tamron 28-75mm G2 compare?

The Tamron 28-75mm G2 is also an exceptionally sharp lens, though some reviews indicate the Sigma may have a slight edge in sharpness, especially at f/2.8. The Tamron uses specialized glass elements like XLD and LD to optimize sharpness and clarity. While very sharp, the Tamron shows slightly more distortion and vignetting. However, the Tamron has the advantage of going out to 75mm for more telephoto reach. For most users, the sharpness of either lens will be more than sufficient.

How is the bokeh on the Sigma 28-70mm?

The Sigma 28-70mm can produce very pleasing bokeh, which refers to the esthetic quality of the out-of-focus areas in an image. The f/2.8 aperture helps create shallow depth of field, which blurs the background and foreground. The 9-blade diaphragm also contributes to smooth, rounded bokeh balls and soft transitions. The bokeh quality is ideal for portraits, macro, and other imagery where subject isolation is important.

How does autofocus compare between the two lenses?

Both lenses use fast, precise autofocus systems suited for stills and video. The Sigma 28-70mm has a newly designed autofocus system with linear STM motors. It focuses accurately in most conditions, though may struggle in very low light. The Tamron 28-75mm G2 uses a ring-type ultrasonic motor for fast, silent autofocus. The Tamron system is slightly faster, but both lenses will work great for most autofocus needs. Manual focus override is available on both lenses.

What are the major differences to consider?

Some of the main differences to weigh are:

· Focal range: Sigma 28-70mm vs Tamron 28-75mm

· Weight: The Tamron (550g) is lighter than the Sigma (720g)

· Weather sealing: Tamron has moisture-resistant construction, Sigma does not.

· Price: The Sigma typically costs a bit less.

Overall, either the Sigma 28-70mm or Tamron 28-75mm G2 would make a fantastic lens for your Sony mirrorless camera. The choice comes down to your specific needs, priorities and budget. Both offer stellar sharpness and performance for the price.

Conclusion

So which lens should you choose for your Sony camera, the Sigma 28-70mm f/2.8 or the Tamron 28-75mm f/2.8 G2? Only you can decide which focal range best suits your needs. But in terms of overall performance, the Sigma holds a slight edge with its wider aperture, superior sharpness, and slightly better build quality. The Tamron still produces beautiful images at a more affordable price point though. Either lens will serve you well. Just remember to think about your shooting style and budget. Then take your time, do your research, and choose the right lens to fulfill your creative vision. With quality glass like these, your Sony mirrorless camera will sing.

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