Sigma 17- vs Tamron 18-

Price Comparison

The Sigma 17-40mm F1.8 DC is priced at $919.00, while the Tamron 18-300mm F/3.5-6.3 is significantly cheaper at $599.00, making it about 35% less expensive. This price difference can be a crucial factor for photographers on a budget or those who are just starting in photography. While the Sigma offers a bright F1.8 constant aperture, the Tamron provides exceptional versatility with its expansive zoom range, making it a more economical choice for varied shooting scenarios.

Optical Quality

The Sigma 17-40mm F1.8 DC is designed with Art-series optics, which deliver sharp detail and professional image quality, particularly in low-light conditions thanks to its constant F1.8 aperture. This feature is particularly beneficial for portrait and travel photography, allowing for creative depth effects. In contrast, the Tamron 18-300mm F/3.5-6.3 maintains high resolving power across its entire zoom range. The lens includes special optical elements that ensure edge-to-edge sharpness, which is crucial for landscape and macro photography. Both lenses offer high optical quality, but the Sigma leans more towards low-light performance while the Tamron excels in versatility.

Aperture and Low-Light Performance

The Sigma 17-40mm F1.8 DC stands out with its constant F1.8 aperture, making it ideal for low-light shooting and creating beautiful bokeh effects. This feature is particularly advantageous for portrait photographers looking to isolate subjects with a soft background. On the other hand, the Tamron 18-300mm has a variable aperture of F3.5-6.3, which is less effective in low-light situations. While it may not match the Sigma’s low-light capabilities, the Tamron’s versatility allows for various shooting conditions, albeit with a compromise in aperture performance when capturing in dim environments.

Zoom Range and Versatility

The Tamron 18-300mm boasts an impressive zoom range of 18-300mm, equivalent to 27mm to 450mm in full-frame terms, making it the world’s first 16.6x all-in-one zoom lens for APS-C mirrorless cameras. This extensive range allows photographers to capture everything from wide-angle shots to ultra-telephoto images, making it an excellent choice for travel and everyday photography. In comparison, the Sigma 17-40mm has a more limited zoom range of 17-40mm, which is suitable for landscapes and portraits but lacks the versatility of the Tamron in capturing distant subjects.

Autofocus System

The Tamron 18-300mm features a VXD linear motor focus mechanism, which provides fast and precise autofocus, ideal for both stills and video shooting. This makes it particularly advantageous for action shots or when capturing spontaneous moments. The Sigma 17-40mm F1.8 DC does not specify its autofocus system's characteristics, but being part of the Art series typically suggests reliability in focus. For those prioritizing autofocus performance, the Tamron’s advanced system may give it an edge, especially for video work where quiet and accurate focus is essential.

Build Quality and Design

The Sigma 17-40mm F1.8 is designed to deliver a professional look and feel, which is essential for serious photographers. However, its specifications do not mention moisture resistance. In contrast, the Tamron 18-300mm is built with moisture-resistant construction and a fluorine coating, enhancing its durability in various shooting conditions. This makes the Tamron a more robust option for outdoor photography, where weather conditions can be unpredictable. The compact and portable design of the Tamron, measuring 4.9 x 2.9 inches and weighing 21.9 ounces, also makes it an attractive choice for travel photographers.

Use Cases

The Sigma 17-40mm F1.8 DC is particularly well-suited for portrait, travel, and video photography, thanks to its constant aperture and exceptional optical quality. It excels in situations where low light is a factor, allowing for creative depth and sharp images. On the other hand, the Tamron 18-300mm is versatile enough to handle a broad range of photography styles, from wide-angle landscapes to close-up macro shots. Its extensive zoom range makes it ideal for everyday life and travel snapshots, effectively covering a multitude of scenarios without needing to switch lenses.

Which should you buy?

Deciding between the Sigma 17-40mm F1.8 DC and the Tamron 18-300mm F/3.5-6.3 ultimately hinges on your specific photography needs and budget. If low-light performance, sharp optical quality, and artistic depth control are your priorities, the Sigma is an excellent choice despite its higher price of $919.00. However, if you seek versatility, convenience, and a more budget-friendly option at $599.00, the Tamron stands out with its extensive zoom range and robust design, making it a compelling choice for a variety of photography conditions.