Sigma 70- vs Canon EF-S 18-

Overview of the Lenses

When comparing the Sigma 70-200mm F2.8 DG DN OS for Sony and the Canon EF-S 18-135mm f/3.5-5.6 is STM, the first takeaway is their significant differences in pricing and intended usage. The Sigma lens is priced at $1,649.00, while the Canon lens is about 17% cheaper at $329.95. This substantial price gap reflects their differing features and target markets, with the Sigma lens aimed at professional photographers and the Canon lens catering to casual users and videographers.

Target Audience

The Sigma 70-200mm F2.8 DG DN OS is designed for serious photographers, particularly those using Sony E-mount and L-Mount cameras. Its premium features, such as a high-response Linear Actuator AF motor and a dust and splash-resistant structure, highlight its suitability for professional use, especially in challenging environments. In contrast, the Canon EF-S 18-135mm f/3.5-5.6 is ideal for entry-level DSLR users or hobbyists looking to capture both still images and videos. Its compact design and refined image stabilization make it user-friendly and versatile for various shooting scenarios.

Optical Performance

In terms of optical quality, the Sigma lens boasts a fixed aperture of F2.8, which allows for excellent low-light performance and depth of field control. This is particularly advantageous for portrait and sports photography where background blur is desired. On the other hand, the Canon lens has a variable aperture ranging from F3.5 to F5.6, which is less optimal for low-light conditions but still provides satisfactory image quality for everyday photography. The presence of one UD and one PMO aspheric lens in the Canon lens helps reduce chromatic aberration, ensuring decent clarity and contrast.

Autofocus Systems

The autofocus capabilities of both lenses differ significantly. The Sigma 70-200mm features a high-response Linear Actuator (HLA) AF motor, promising quick and precise focusing, which is crucial for capturing fast-moving subjects. This makes it a preferred choice for sports and wildlife photographers. Conversely, the Canon EF-S 18-135mm employs an inner focusing system and a stepping motor that supports Movie Servo AF for smooth and quiet continuous autofocus during video shooting. While the Canon lens excels in video applications, the Sigma lens is better suited for high-speed photography.

Build Quality and Durability

The Sigma lens stands out with its dust and splash-resistant structure, making it a robust option for outdoor photographers who often face unpredictable weather conditions. Its superior weather resistance is a hallmark of SIGMA's Sports line, which is designed to withstand rigorous use. In comparison, the Canon EF-S 18-135mm, while well-constructed, lacks the same level of environmental sealing, making it less ideal for use in adverse conditions. This difference highlights the Sigma's professional-grade build quality versus the Canon's consumer-oriented design.

Versatility and Range

The focal lengths of these two lenses cater to different photographic needs. The Sigma 70-200mm offers a longer reach, making it suitable for sports, wildlife, and portrait photography. Its zoom range allows for exquisite composition at a distance without disturbing the subject. In contrast, the Canon EF-S 18-135mm provides a more versatile zoom range that covers wide-angle to moderate telephoto, making it an excellent all-around lens for landscape, street, and general photography. This versatility is further enhanced by the lens's compact size, which appeals to photographers who prioritize portability.

Image Stabilization

Image stabilization is another critical factor in comparing these lenses. The Sigma lens features Optical Stabilization (OS) that helps mitigate camera shake, enhancing image sharpness at slower shutter speeds. This is particularly beneficial for handheld photography in low light. The Canon lens, on the other hand, boasts a refined image stabilization system that delivers up to four equivalent stops of shake correction throughout its zoom range. This makes it particularly effective for videography, where steady shots are crucial, especially when moving.

Which should you buy?

Deciding between the Sigma 70-200mm F2.8 DG DN OS for Sony and the Canon EF-S 18-135mm f/3.5-5.6 is STM ultimately hinges on your photography needs and budget. If you are a professional or serious enthusiast looking for a high-performance lens with superior optical quality and build, the Sigma lens is worth the investment at $1,649.00. However, if you are a casual user or videographer seeking a versatile and budget-friendly lens, the Canon lens at $329.95 offers excellent value without compromising too much on quality.