The Sigma 20-40mm f/2.8 EX DG ASP lens is a versatile zoom lens designed for use with digital cameras. This lens offers a wide focal length range of 20mm to 40mm, making it suitable for a variety of photography genres such as landscape, street, and portrait photography. With a constant aperture of f/2.8 throughout the zoom range, this lens allows for excellent low-light performance and shallow depth of field effects.
The “EX” designation in the lens name signifies that it belongs to Sigma’s high-performance lineup, known for their exceptional optical quality and build. “DG” stands for “Digital optimized,” indicating that the lens is designed to deliver superior image quality when used with full-frame or APS-C sensor cameras.
**Features and Specifications**
The Sigma 20-40mm f/2.8 EX DG ASP lens boasts a range of features that make it a valuable addition to any photographer’s kit. Let’s take a closer look at its specifications:
1. **Wide Aperture**: The constant maximum aperture of f/2.8 allows for consistent exposure settings throughout the zoom range and enables shooting in low-light conditions.
2. **Advanced Optical Design**: The lens construction comprises 15 elements in 11 groups, including three aspherical elements to minimize various aberrations and achieve sharp and detailed images.
3. **High-Speed AF**: The lens incorporates Sigma’s Hyper Sonic Motor (HSM) for fast and silent autofocus performance, ensuring quick and accurate focusing.
4. **Full-Time Manual Focus**: A convenient feature that allows photographers to fine-tune focus manually, even when autofocus is engaged.
5. **Durable Build**: The lens features a sturdy construction with a metal lens mount, making it suitable for regular use in various shooting conditions.
6. **Compact and Lightweight**: Despite its versatility, the Sigma 20-40mm f/2.8 EX DG ASP lens remains relatively compact and lightweight, making it easy to carry around for extended periods.
**Release Date and Pricing**
The Sigma 20-40mm f/2.8 EX DG ASP lens was released in March 2002. At the time of its release, it garnered attention for its excellent optical performance and relatively affordable price compared to other lenses in its class. The lens was priced at around $500, making it an attractive option for photographers looking to expand their lens collection without breaking the bank.
**Practical Experience**
I had the opportunity to use the Sigma 20-40mm f/2.8 EX DG ASP lens on my full-frame digital camera, and I was impressed with its performance. The lens delivered sharp and detailed images throughout the focal length range, and the wide maximum aperture of f/2.8 allowed me to capture stunning shots in low-light conditions.
The autofocus was fast and accurate, thanks to the lens’s HSM motor, enabling me to swiftly lock onto subjects and capture decisive moments without any issues. I also appreciated the full-time manual focus override, which allowed me to make precise adjustments when needed.
Overall, the Sigma 20-40mm f/2.8 EX DG ASP lens proved to be a reliable and versatile option for various photography needs. Whether I was capturing sweeping landscapes or getting up close for portrait shots, this lens consistently delivered excellent image quality.
In conclusion, the Sigma 20-40mm f/2.8 EX DG ASP lens is a high-quality and affordable zoom lens that offers photographers the flexibility and performance they need to capture outstanding images. Its wide aperture, advanced optics, and durable build make it a valuable tool in any photographer’s arsenal.
