Sigma 17- vs SIGMA 18-

Overview of the Sigma 17-40mm F1.8 DC and Sigma 18-50mm F2.8 DC DN

The Sigma 17-40mm F1.8 DC is designed for Sony E-mount APS-C cameras, offering a bright constant aperture of F1.8. In contrast, the Sigma 18-50mm F2.8 DC DN is tailored for Canon RF mount mirrorless cameras, featuring a versatile F2.8 aperture. This key difference underscores the distinct target audiences and use cases for these lenses, with the former excelling in low-light situations and creative depth effects, while the latter focuses on compactness and ease of use.

Price Comparison

The Sigma 17-40mm F1.8 DC is priced at $919.00, making it a premium option. On the other hand, the Sigma 18-50mm F2.8 DC DN is priced at $599.99, which is about 35% cheaper than the 17-40mm lens. This significant price difference may influence potential buyers, especially those looking for a high-performance lens at a more accessible price point. The lower price of the 18-50mm lens does not sacrifice quality, making it an attractive choice for Canon RF mount users.

Aperture and Low-Light Performance

The Sigma 17-40mm F1.8 DC boasts a constant F1.8 aperture, which is particularly advantageous for low-light photography and achieving beautiful bokeh effects. This feature allows photographers to capture sharp images even in dimly lit environments. In contrast, the Sigma 18-50mm F2.8 DC DN has a maximum aperture of F2.8, which, while still respectable, does not match the low-light capabilities of the 17-40mm. Consequently, if low-light performance is a priority, the 17-40mm lens may be the preferable option.

Optical Quality

Both lenses are part of Sigma's renowned series, emphasizing optical excellence. The Sigma 17-40mm F1.8 DC is categorized as an Art-series lens, promising sharp detail and professional image quality. Its design is tailored for serious photographers who demand the best in image clarity and color fidelity. Meanwhile, the Sigma 18-50mm F2.8 DC DN is part of the Contemporary line, which balances performance and compact design. While it offers high-quality optics, it may not reach the pinnacle of the Art series but is certainly adequate for most photography needs.

Weight and Portability

The Sigma 18-50mm F2.8 DC DN is lightweight and compact, weighing only 300g, which makes it the smallest and lightest in its class. This feature is a significant advantage for photographers who prioritize portability and ease of handling during shoots. Conversely, the Sigma 17-40mm F1.8 DC, while not overly cumbersome, is likely to be heavier and bulkier due to its larger aperture and robust construction. For travel photographers or those who frequently shoot on the go, the lightweight design of the 18-50mm lens could be a decisive factor.

Focusing Capabilities

The Sigma 18-50mm F2.8 DC DN offers a minimum focusing distance of 12.1cm, allowing for close-up shots with a maximum magnification of 1:2.8. This feature makes it suitable for various photography types, including macro and detail shots. In contrast, while specific minimum focusing distances for the Sigma 17-40mm F1.8 DC are not mentioned, its primary strength lies in versatility across a range of focal lengths rather than macro capabilities. Therefore, if close-up photography is a priority, the 18-50mm may be more appealing.

Environmental Sealing

The Sigma 18-50mm F2.8 DC DN includes a rubber-sealed mount, enhancing its durability and making it suitable for various environments. This feature can be particularly beneficial for outdoor photographers who often face changing weather conditions. The Sigma 17-40mm F1.8 DC does not mention any environmental sealing, which may limit its use in adverse conditions. For users who plan to shoot in unpredictable weather, the added protection of the 18-50mm lens could be a significant advantage.

Which should you buy?

Ultimately, the choice between the Sigma 17-40mm F1.8 DC and the Sigma 18-50mm F2.8 DC DN comes down to your specific photography needs and preferences. If you prioritize low-light performance, optical excellence, and are using a Sony E-mount camera, the 17-40mm lens is an excellent investment. However, if you are looking for a more affordable, lightweight, and versatile option for Canon RF mount cameras, the 18-50mm lens shines with its compact design and effective close-up capabilities. Consider your shooting style, budget, and brand compatibility to make the best decision for your photographic journey.