Canon EF-S 18- vs Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens

Overview of the Canon EF-S 18-135mm f/3.5-5.6 IS STM and Canon RF50mm F1.8 STM Lens

The Canon EF-S 18-135mm f/3.5-5.6 IS STM is priced at $329.95, while the Canon RF50mm F1.8 STM Lens is available for $219.00, making it about 17% cheaper than the EF-S lens. The two lenses cater to different photography needs, with the EF-S lens offering versatility with its zoom range and the RF50mm lens providing a fixed focal length ideal for low-light conditions and creative effects. Understanding the strengths of each lens can help you choose the right one for your photography style.

Design and Build Quality

Both lenses showcase Canon's signature build quality, but they serve distinct purposes. The Canon EF-S 18-135mm has a zoom mechanism, allowing for a focal range from 18mm to 135mm, making it suitable for various shooting scenarios. Its inner focusing system helps prevent the lens from extending accidentally, which is a thoughtful feature for on-the-go photographers. On the other hand, the Canon RF50mm F1.8 is compact and lightweight, designed explicitly for mirrorless EOS R series cameras. Its straightforward design emphasizes portability without sacrificing functionality, making it an excellent choice for those who prefer a minimalistic setup.

Focal Length and Aperture

A significant difference between these two lenses is their focal length and maximum aperture. The Canon EF-S 18-135mm features a variable aperture of f/3.5-5.6, which is versatile but may limit low-light performance compared to the fixed f/1.8 aperture of the RF50mm. This larger aperture enables better performance in low-light conditions and allows for a shallow depth of field, perfect for portraits with beautiful background blur. The EF-S lens offers a broader range suitable for landscapes and various subjects, but if low-light shooting or creative blurring is your priority, the RF50mm stands out.

Autofocus Performance

Autofocus capability can significantly impact your shooting experience, especially in fast-paced environments. The Canon EF-S 18-135mm employs a high-speed autofocus mechanism thanks to its inner focusing system and optimized AF algorithm. This results in smooth and precise focusing, which is particularly advantageous for video shooting. In contrast, the Canon RF50mm F1.8 uses a stepping motor that provides smooth and quiet continuous autofocus, making it ideal for both photo and video applications. While both lenses excel at autofocus, the RF50mm’s quiet operation is particularly appealing for videographers.

Image Stabilization

Image stabilization is crucial for handheld shooting, especially at longer focal lengths. The Canon EF-S 18-135mm is equipped with a refined Image Stabilization system that delivers up to four equivalent stops of shake correction, making it suitable for capturing steady images even when shooting at the telephoto end. Conversely, the RF50mm F1.8 does not mention an image stabilization feature, which could be a consideration for those who frequently shoot without a tripod. If you often shoot at slower shutter speeds or in challenging conditions, the EF-S lens may provide an edge.

Optical Performance

When it comes to optical quality, both lenses boast impressive features aimed at reducing aberrations and enhancing image clarity. The EF-S lens incorporates one UD and one PMO aspheric lens to deliver high resolution and contrast while minimizing chromatic aberration. The RF50mm also features a PMO aspherical lens along with optimized coatings to help maintain color balance and reduce ghosting and flare. Both lenses are designed to produce high-quality images, but the EF-S lens offers versatility across a range of focal lengths, while the RF50mm excels in low-light scenarios and portrait shots.

Price Comparison

Price is a decisive factor in choosing between these two lenses. The Canon EF-S 18-135mm is priced at $329.95, while the Canon RF50mm F1.8 is significantly more affordable at $219.00. This price difference of $110.95 may influence budget-conscious photographers or those just starting in the field. While the EF-S lens offers versatility, the value proposition of the RF50mm, especially for those who primarily shoot portraits or low-light photography, should not be overlooked.

Which should you buy?

Choosing between the Canon EF-S 18-135mm f/3.5-5.6 IS STM and the Canon RF50mm F1.8 STM lens depends on your specific photography needs. If you require a versatile zoom lens that performs well in various situations, the EF-S lens may be the better option despite its higher price. However, if you prioritize low-light performance, a compact design, and affordability, the RF50mm is an excellent choice. Ultimately, consider your photographic style and the types of images you want to capture before making your decision.