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Canon RF 75- vs SIGMA 18-

Updated July 2026 — Canon RF 75- wins on focal range and weight, SIGMA 18- wins on length and diameter.

The Canon RF 75-300mm f/4-5.6 Lens offers excellent value for general photography, while the SIGMA 18-50mm F2.8 excels in low-light performance and build quality.

Why Canon RF 75- is better

Price

Canon is significantly more affordable at $253.95.

Weight

Canon is lighter at just over 1 lb.

Focal Range

Canon offers a longer focal range of 75-300mm.

Why SIGMA 18- is better

Aperture

SIGMA has a constant f/2.8 aperture for better low-light performance.

Build Quality

SIGMA features a rubber-sealed mount for durability.

Compactness

SIGMA is the smallest and lightest in its class.

Overall score

Canon RF 75-
75
SIGMA 18-
85

Specifications

SpecCanon RF 75-SIGMA 18-
Aperturef/4-5.6f/2.8
Max Zoom300mm50mm
Min Focus4.9ft12.1cm
AutofocusDC MotorHigh Performance
Image QualityGoodExcellent

Dimension comparison

Canon RF 75-SIGMA 18-

Overview of the Canon RF 75-300mm f/4-5.6 Lens

The Canon RF 75-300mm f/4-5.6 Lens offers a versatile telephoto zoom range ideal for various photography styles. Priced at $253.95, this lens is aimed at those looking for a lightweight option that does not compromise on performance. With a focal length of 75-300mm, it is suitable for sports, wildlife, and portrait photography while remaining compact enough for everyday use. Additionally, its design incorporates Canon’s Super Spectra Coating, which helps to minimize lens flare and ghosting, ensuring high-quality images even in challenging lighting conditions.

Overview of the SIGMA 18-50mm F2.8 DC DN Contemporary Lens

The SIGMA 18-50mm F2.8 DC DN Contemporary Lens is priced at $599.99 and is designed specifically for Canon RF Mount mirrorless cameras. This lens offers a constant maximum aperture of f/2.8, which is beneficial for low-light conditions and provides a shallow depth of field. Its compact design makes it the smallest in its class, with a lightweight body that enhances portability and ease of use. The lens also features a rubber-sealed mount for added durability, making it suitable for various shooting environments.

Design and Build Quality

In terms of design, the Canon RF 75-300mm f/4-5.6 Lens is lightweight, weighing just over 1 lb, which is ideal for photographers on the go. It has a slim profile with a 58mm filter thread, allowing for easy attachment of filters. The lens is constructed to balance reach and portability, making it an optimal choice for travel photography.

Conversely, the SIGMA 18-50mm F2.8 lens is notable for its compactness at only 300g, with a maximum diameter of 69.2mm and a length of 74.5mm. This makes it extremely portable, further enhanced by its rubber-sealed mount that provides protection against dust and moisture. While both lenses prioritize portability, the SIGMA lens shines in its weather-resistant features, making it more versatile in challenging conditions.

Image Quality

The Canon RF 75-300mm lens is designed to deliver sharp images with excellent color fidelity. Its optical design is optimized for clarity, benefiting from Canon’s Super Spectra Coating to enhance contrast and reduce lens flare. This makes it particularly effective in bright or backlit conditions, which is crucial for outdoor photography.

On the other hand, the SIGMA 18-50mm F2.8 offers high-performance optics that are known for exceptional image quality. With a constant aperture of f/2.8, it allows for better low-light performance and creative depth of field effects. The lens’s minimum focusing distance of 12.1cm and maximum magnification of 1:2.8 facilitate close-up shots, providing versatility that can cater to both wide-angle and macro photography.

Autofocus Performance

The Canon RF 75-300mm f/4-5.6 features a DC motor for autofocus, delivering responsive and accurate focusing performance suitable for both stills and video. This capability is particularly advantageous for capturing fast-moving subjects, making it an excellent choice for sports and wildlife photography.

In contrast, the SIGMA lens primarily focuses on delivering high-quality images with a reliable autofocus system. While specific details about its autofocus mechanism are not provided, it is designed for high-performance applications on Canon RF mount systems. Photographers seeking a balance between versatility and speed would likely find both lenses competent, although the Canon's DC motor may offer a slight edge in dynamic shooting situations.

Price Comparison

The Canon RF 75-300mm f/4-5.6 Lens retails for $253.95, making it a substantially more affordable option compared to the SIGMA 18-50mm F2.8, which is priced at $599.99. This results in a price difference of $346.04, or about 136%. For photographers on a budget or those who are just starting, the Canon lens provides significant value without sacrificing essential features.

For more advanced users or those who require a versatile low-light lens, the investment in the SIGMA might be justified. However, for general photography needs and portability, the Canon lens remains a strong contender.

Target Audience

The Canon RF 75-300mm f/4-5.6 Lens is geared toward enthusiasts and casual photographers who need a versatile telephoto zoom lens. Its lightweight design and broad focal range make it perfect for capturing everyday moments as well as more specialized sports and wildlife photography.

In contrast, the SIGMA 18-50mm F2.8 lens is aimed at more serious photographers who require high-quality optics and consistent performance across a variety of shooting conditions. The ability to shoot in low light with a constant f/2.8 aperture and its durable design make it perfect for professionals and frequent shooters.

Which should you buy?

Choosing between the Canon RF 75-300mm f/4-5.6 Lens and the SIGMA 18-50mm F2.8 DC DN lens ultimately depends on your photography needs and budget. If you require a lightweight, budget-friendly lens for general photography, the Canon is an excellent choice at $253.95. However, if you seek superior low-light performance and versatility in a compact design, the SIGMA lens, priced at $599.99, is worth the investment. Each lens serves its unique purpose; thus, your decision should reflect your specific photography goals and style.