Canon RF-S18- vs Canon RF45mm F1.2 STM
Updated July 2026 — Canon RF-S18- wins on zoom range and price, Canon RF45mm F1.2 STM wins on build quality.
The Canon RF-S18-150mm offers versatility and stabilization, while the RF45mm excels in low-light performance and bokeh. Choose based on your photography needs.
Why Canon RF-S18- is better
Price
RF-S18-150mm is $569.00, while RF45mm is $469.00.
Versatility
RF-S18-150mm has a zoom range of 18-150mm.
Stabilization
RF-S18-150mm features in-lens optical image stabilization.
Why Canon RF45mm F1.2 STM is better
Aperture
RF45mm has a larger f/1.2 aperture.
Bokeh
RF45mm creates better subject isolation.
Low-Light
RF45mm performs better in low-light conditions.
Overall score
Specifications
| Spec | Canon RF-S18- | Canon RF45mm F1.2 STM |
|---|---|---|
| Focal Length | 18-150mm | 45mm |
| Max Aperture | f/3.5-6.3 | f/1.2 |
| Image Stabilization | Yes | No |
| Autofocus | STM | STM |
| Ideal For | Versatility | Low-Light |
Dimension comparison
Price Comparison
The Canon RF45mm F1.2 STM is about 17% cheaper than the Canon RF-S18-150mm F3.5-6.3 Telephoto Lens, with a current price of $469.00 compared to $569.00. When considering budget constraints, the price difference could significantly influence your decision. The RF45mm offers a high-quality lens at a lower price point, making it an attractive option for photographers looking to save money without sacrificing performance. If you're more focused on versatility and zoom range, the RF-S18-150mm may justify its higher price.
Lens Type and Versatility
The RF-S18-150mm is a versatile high-magnification zoom lens, while the RF45mm is a standard prime lens. The zoom range of the RF-S18-150mm spans from 18mm to 150mm, making it suitable for various photography styles, from landscapes to portraits. In contrast, the RF45mm offers a fixed focal length of 45mm, which is great for creating images with a three-dimensional look due to its f/1.2 aperture. If you frequently switch between different types of shots, the RF-S18-150mm's zoom capability may be more beneficial.
Aperture and Low-Light Performance
The RF45mm boasts an impressive f/1.2 aperture, allowing for faster shutter speeds in low-light conditions. This is a significant advantage if you're often shooting in dim environments or want to achieve a shallow depth of field for artistic effects. The RF-S18-150mm, on the other hand, has a variable aperture of f/3.5-6.3, which means it may struggle more in low-light situations. For photographers who prioritize low-light performance and beautiful bokeh, the RF45mm is the superior choice.
Autofocus and Stabilization
The RF-S18-150mm features a lead screw-type STM that provides smooth autofocusing, particularly useful during video shooting, while the RF45mm also employs STM technology. However, the RF-S18-150mm includes in-lens optical image stabilization, which offers up to 4.5 stops of shake correction, or up to 6.5 stops when combined with compatible EOS R series cameras. This stabilization feature can prove invaluable when shooting handheld, especially at longer focal lengths. In contrast, the RF45mm lacks built-in image stabilization, which could be a drawback if you often shoot without a tripod.
Build Quality and Design
Both lenses are designed with Canon's quality standards, but they cater to different user needs. The RF-S18-150mm is crafted to be versatile, making it ideal for travel and everyday use. Its design includes a compact and lightweight structure, which is advantageous for on-the-go shooting. Meanwhile, the RF45mm's compact design paired with a large-diameter lens allows for exceptional optical performance. If durability and a robust design are significant to you, consider how you plan to use these lenses in different environments.
Subject Isolation and Bokeh
For creating images with a soft, artistic background, the RF45mm excels due to its large f/1.2 aperture, which allows for beautiful bokeh. This feature is particularly beneficial for portrait photographers who wish to isolate their subjects from the background effectively. The RF-S18-150mm, while versatile, may not achieve the same level of subject isolation due to its smaller maximum aperture, making it less effective for artistic portraits. If your photography heavily relies on aesthetic background blur, the RF45mm is the better option.
Target Audience
The RF-S18-150mm is aimed at photographers who need a flexible lens for various scenarios, making it a great choice for hobbyists and travelers. Its zoom range allows users to tackle a multitude of photographic subjects without needing to switch lenses frequently. Conversely, the RF45mm targets professionals and serious enthusiasts who prioritize low-light performance and depth of field. If you are an aspiring photographer or enjoy casual shooting, the RF-S18-150mm may suit your needs better, while seasoned artists may find the RF45mm more aligned with their creative goals.
Which should you buy?
In deciding between the Canon RF-S18-150mm F3.5-6.3 Telephoto Lens and the Canon RF45mm F1.2 STM, consider your specific photography needs. If you require versatility, the RF-S18-150mm, with its extensive zoom range and image stabilization, is ideal for capturing a variety of scenes. However, if low-light performance and beautiful bokeh are paramount, the RF45mm's superior aperture makes it the better choice. Ultimately, understanding your shooting style will guide you toward the lens that best fits your creative vision.

