OM SYSTEM Olympus M.Zuiko Digital 40- vs Sigma 28-
Updated July 2026 — OM SYSTEM Olympus M.Zuiko Digital 40- wins on focal length and aperture, Sigma 28- wins on price and weight.
The OM SYSTEM lens offers great value for budget-conscious photographers, while the Sigma lens excels in image quality and low-light performance.
Why OM SYSTEM Olympus M.Zuiko Digital 40- is better
Price
OM SYSTEM lens is significantly cheaper at $175.99.
Portability
Lightweight design ideal for outdoor shooting.
Zoom Range
Versatile 40-150mm focal length for various scenarios.
Why Sigma 28- is better
Image Quality
Sigma lens rivals higher-end lenses with outstanding optical performance.
Low-Light Performance
Constant F2.8 aperture allows for better low-light shooting.
Build Quality
Superb build quality enhances durability for professional use.
Overall score
Specifications
| Spec | OM SYSTEM Olympus M.Zuiko Digital 40- | Sigma 28- |
|---|---|---|
| Focal Length | 40-150mm | 28-70mm |
| Max Aperture | F4.0-5.6 | F2.8 |
| Autofocus | High-Speed AF | Internal Focusing |
| Weight | Lightweight | Compact |
| Image Quality | Sharp | Outstanding |
Dimension comparison
Overview of the Lenses
The OM SYSTEM Olympus M.Zuiko Digital 40-150mm F4.0-5.6 R Silver is designed for Micro Four Thirds system cameras, while the Sigma 28-70mm F2.8 DG DN is tailored for Sony E-mount cameras. The Olympus lens is priced at $175.99, making it significantly less expensive than the Sigma lens, which retails for $859.95. This price difference of about 79% highlights the varying target audiences and use cases for each lens.
Design and Build Quality
Both lenses exhibit a commitment to portability, but they cater to different user needs. The OM SYSTEM lens is noted for its portable design, ideal for photographers seeking a lightweight option for outdoor shooting. In contrast, the Sigma lens boasts superb build quality and a lightweight, compact body, making it an excellent choice for day-to-day use. While the Sigma lens may be heavier on the wallet, it promises durability and performance that many professional users may find worth the investment.
Focal Length and Aperture
The Olympus lens features a focal length of 40-150mm with a maximum aperture of F4.0-5.6, providing versatility for various shooting scenarios, especially in wildlife and portrait photography. Meanwhile, the Sigma lens offers a shorter focal length of 28-70mm but maintains a constant maximum aperture of F2.8. This larger aperture allows for better low-light performance and more creative depth-of-field effects. For photographers who prioritize low-light capability, the Sigma lens may be more appealing despite its higher price.
Autofocus and Performance
Autofocus performance is a crucial aspect of any camera lens. The OM SYSTEM lens includes High-Speed Imager AF (MSC), which enhances its ability to focus quickly and accurately, particularly beneficial for capturing fast-moving subjects. On the other hand, the Sigma lens offers internal focusing and a focus mode switch, making it versatile for different shooting styles. While both lenses promise good autofocus capabilities, the specifics of their features may appeal differently based on a photographer's needs.
Image Quality
Image quality is paramount for any lens, and both options have their strengths. The OM SYSTEM lens, with its 40-150mm focal range, is designed to deliver sharp images across its zoom range, particularly for Micro Four Thirds users. Conversely, the Sigma lens is built on an optical design renowned for its performance throughout its zoom range, rivaling even the higher-end Art line lenses. This commitment to image quality, particularly at F2.8, positions the Sigma lens as a strong contender for those prioritizing professional-grade images.
Target Audience
The target audiences for these two lenses diverge significantly due to their respective features and price points. The OM SYSTEM lens appeals primarily to amateur and enthusiast photographers who demand versatility without a hefty price tag. With a price of $175.99, it is an excellent entry point for those looking to expand their Micro Four Thirds lens collection. Meanwhile, the Sigma lens targets more serious photographers and professionals who require high-quality optics and are willing to invest in a premium lens. The $859.95 price tag aligns with its performance capabilities.
Use Cases
The intended use cases for each lens further highlight their differences. The OM SYSTEM lens is perfect for those who enjoy shooting sports, wildlife, or portraits, thanks to its zoom range and lightweight design. It allows for flexibility in various shooting conditions. In contrast, the Sigma lens is more suited for general photography, especially in environments where low-light performance and depth of field are critical. Its larger aperture makes it ideal for creative portraiture and event photography.
Which should you buy?
Choosing between the OM SYSTEM Olympus M.Zuiko Digital 40-150mm F4.0-5.6 R Silver and the Sigma 28-70mm F2.8 DG DN depends on your specific needs and budget. If you're looking for an affordable, versatile lens for a Micro Four Thirds camera, the OM SYSTEM lens at $175.99 offers excellent value. However, if you prioritize image quality and low-light performance, the Sigma lens is worth the higher investment of $859.95. Ultimately, your decision should align with your photography style and the types of subjects you intend to capture.

