Review: Canon EF 28-105mm f/3.5-4.5 USM – A Versatile Standard Zoom
The Canon EF 28-105mm f/3.5-4.5 USM lens stands as a testament to a previous era of standard zoom design, having been a popular and widely used optic for Canon's EF-mount film and early digital SLR cameras. Positioned as a versatile, all-in-one solution, it offered photographers a broad focal range in a relatively compact and lightweight package, catering to a diverse array of photographic disciplines. While its design principles predate many modern optical advancements, it remains a lens with a distinct set of strengths and limitations, making it a subject worthy of objective review.
Design and Build Quality
Weighing in at a mere 375 grams, the EF 28-105mm f/3.5-4.5 USM is notably light for a full-frame capable zoom lens covering this focal range. Its construction is largely plastic, typical for a lens of its class and time, yet it generally feels adequately robust for everyday use. The 58mm filter thread is a common size, making filter acquisition straightforward and often transferable from other lenses. The lens extends somewhat when zooming to its telephoto end, but the overall profile remains manageable. While not boasting weather sealing or a professional-grade metallic barrel, its utilitarian design prioritizes portability and functionality, aligning with its role as a general-purpose option.
Focal Length Versatility
On a full-frame EF body, the 28-105mm focal range offers significant flexibility. The 28mm wide-angle end is well-suited for capturing expansive scenes, making it a viable choice for landscape photography where broad vistas and architectural interiors are common. It also proves useful for street photography, allowing for wider contextual shots. As the lens zooms to 105mm, it transitions into a short telephoto perspective. This reach is particularly beneficial for isolating subjects, useful in portraiture for headshots or environmental portraits, and for bringing distant elements closer in travel photography. This comprehensive range, from moderate wide-angle to a useful telephoto, underpins its primary strength as a general-purpose and travel photography companion, minimizing the need to switch lenses in dynamic shooting environments.
Aperture and Diaphragm
The lens features a variable maximum aperture of f/3.5 at 28mm, narrowing to f/4.5 at 105mm. This variable aperture is a characteristic common to many standard zooms that prioritize compact size and affordability over light-gathering capability. While not a "fast" lens, the f/3.5-4.5 aperture is sufficient for well-lit conditions. In low-light scenarios, users may need to rely on higher ISO settings or a tripod due to the absence of image stabilization (IS). The lens incorporates 7 diaphragm blades, which generally contribute to a reasonably smooth, if not exceptionally creamy, out-of-focus background (bokeh), particularly when shooting at 105mm at its widest aperture of f/4.5, where some subject isolation can be achieved.
Autofocus Performance
One of the standout features of this lens, particularly for its era, is the inclusion of Canon's Ultrasonic Motor (USM). This technology delivers fast, quiet, and precise autofocusing. The USM system is a significant advantage for a general-purpose lens, as it allows for quick subject acquisition, which is crucial for candid moments in street photography and dynamic scenes during travel photography. The quiet operation also makes it less intrusive in sensitive environments or when shooting video, though the lens itself is not specifically designed for video capture. The full-time manual focus override, often associated with USM lenses, further enhances its user experience by allowing fine adjustments without disengaging autofocus.
Optical Performance
Examining the optical performance, the EF 28-105mm f/3.5-4.5 USM provides a decent showing for its class. The incorporation of an aspherical element aims to improve image quality by reducing spherical aberrations and ensuring better sharpness across the frame.
- Sharpness: In the center of the frame, sharpness is generally good, especially when stopped down slightly (e.g., to f/5.6 or f/8). However, according to independent reviews such as Photozone.de, corner sharpness can be a weaker point, particularly at wider apertures and the extreme ends of the focal range (28mm and 105mm), where some softness may be evident. For many general-purpose applications, especially when images are not viewed at 100% crops or printed very large, this may not be a critical issue.
- Distortion: Like many zoom lenses, this optic exhibits noticeable distortion. At the 28mm wide-angle end, barrel distortion is present, causing straight lines to bow outwards. As the lens zooms towards 105mm, this transitions into pincushion distortion, where straight lines appear to pinch inwards. These distortions are generally correctable in modern post-processing software.
- Vignetting: Vignetting, or corner darkening, is also present, especially when shooting wide open at f/3.5-4.5, particularly at 28mm and 105mm. Stopping down the aperture typically mitigates this effect.
- Chromatic Aberration: Lateral chromatic aberration (CA) is generally moderate. While visible in high-contrast areas, it is often well within the range that can be effectively corrected in post-production.
Limitations and Considerations
Beyond the optical characteristics, the most significant limitation for a modern photographer using this lens is the absence of image stabilization. For handheld shooting in dim light or at slower shutter speeds, this necessitates higher ISO settings, potentially introducing more noise, or the use of a tripod. Compared to modern stabilized kit lenses, this can be a notable drawback. Furthermore, while the USM is fast, the overall optical design is an older one, meaning it may not match the edge-to-edge sharpness, micro-contrast, or flare resistance of more contemporary lens designs. Its variable aperture, while contributing to its compact size and affordability, also means that exposure can change when zooming, which can be less convenient for video work or precise manual exposure settings.
Conclusion
The Canon EF 28-105mm f/3.5-4.5 USM remains a functional and highly versatile standard zoom lens, particularly for those using Canon EF-mount DSLRs. Its strengths lie in its excellent focal range covering wide-angle to short telephoto, its notably lightweight and portable design, and its fast, quiet Ultrasonic Motor autofocus. These attributes make it an outstanding choice for general-purpose photography, an ideal travel companion due to its versatility and low weight, and capable for opportunistic landscape, street, and even some portraiture work.
While it exhibits some optical compromises common to lenses of its class and era—such as variable aperture, a lack of image stabilization, and less-than-perfect corner sharpness—these are often manageable for its intended use cases. For photographers seeking an affordable, robust, and highly adaptable lens to cover a broad spectrum of shooting situations on their EF DSLR, the EF 28-105mm f/3.5-4.5 USM offers considerable value and reliable performance, particularly as a compact, all-day walk-around option.