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Canon RF45mm F1.2 STM vs TTArtisan

Updated July 2026 — Canon RF45mm F1.2 STM wins on aperture and build quality, TTArtisan wins on price and weight.

The Canon RF45mm F1.2 STM offers superior low-light performance and image quality, while the TTArtisan 40mm F2 L is a budget-friendly alternative with solid capabilities.

Why Canon RF45mm F1.2 STM is better

Aperture

Canon has a wider f/1.2 aperture for better low-light performance.

Image Quality

Canon excels in producing beautiful bokeh and subject isolation.

Brand Reputation

Canon is known for high-quality optics and reliability.

Why TTArtisan is better

Price

TTArtisan is significantly cheaper at $168.

Weight

TTArtisan is lighter, weighing only 167g.

Autofocus

TTArtisan features quiet and fast STM autofocus.

Overall score

Canon RF45mm F1.2 STM
88
TTArtisan
74

Specifications

SpecCanon RF45mm F1.2 STMTTArtisan
Max Aperturef/1.2f/2
Focal Length45mm40mm
WeightN/A167g
Autofocus TypeN/ASTM
Price$469.00$168.00
Image StabilizationNoNo

Dimension comparison

Canon RF45mm F1.2 STMTTArtisan

Overview of Canon RF45mm F1.2 STM

The Canon RF45mm F1.2 STM is a versatile prime lens designed for creators who seek exceptional image quality and performance. Priced at $469.00, this lens offers a wide aperture of f/1.2, making it ideal for low-light conditions and achieving stunning bokeh. The lens is compact and employs digital distortion correction, resulting in a refined visual output suitable for a variety of photography styles. Canon's addition of a PMo aspheric lens helps reduce aberrations, enhancing overall image clarity and sharpness.

Overview of TTArtisan 40mm F2 L

The TTArtisan 40mm F2 L lens is a more budget-friendly option, retailing at $168.00. With a maximum aperture of f/2, it provides solid low-light performance and fast shutter speeds. This lens features a compact design and weighs between 167-176g, making it easy to handle during extended shoots. It incorporates ED and aspherical elements to control chromatic aberration while maintaining image clarity. The 40mm focal length serves as a versatile choice for street and travel photography, allowing photographers to balance environmental context with subject isolation.

Design and Build Quality

The Canon RF45mm F1.2 STM boasts a thoughtfully designed build that combines functionality with aesthetic appeal. Its large-diameter lens mount and short back focus contribute to both a compact form factor and the high-quality optics that Canon is known for. In contrast, the TTArtisan 40mm F2 L is designed to be lightweight and compact, weighing only about 167g. This makes it an excellent choice for photographers looking to maintain balance and ease of use during shoots. While both lenses are well-crafted, the Canon lens offers a more premium feel and advanced optical features.

Aperture and Low-Light Performance

When it comes to aperture and low-light performance, the Canon RF45mm F1.2 STM clearly has an edge with its f/1.2 maximum aperture. This allows for faster shutter speeds in darker environments, making it particularly advantageous for portrait and lifestyle photography. The TTArtisan 40mm F2 L, with its f/2 aperture, still performs well in low light but does not quite match the capabilities of the Canon lens. The difference in aperture size translates to about a 50% increase in light-gathering ability for the Canon lens, providing a significant advantage for photographers who frequently work in challenging lighting conditions.

Autofocus Capabilities

The autofocus technology in the TTArtisan 40mm F2 L utilizes an STM stepping motor, which ensures quiet and fast focusing. This feature is particularly beneficial for video recording or capturing spontaneous moments. While the Canon RF45mm F1.2 STM does not specify its autofocus mechanism, it is known for reliable performance in various shooting situations. Both lenses offer effective autofocus, but the TTArtisan's design may appeal more to videographers and those needing quick adjustments in dynamic environments.

Image Quality

Image quality is a critical consideration for photographers, and both lenses deliver impressive results. The Canon RF45mm F1.2 STM lens excels in producing images with a three-dimensional look, thanks to its ability to create beautiful bokeh. It effectively isolates subjects from the background, which is crucial for portrait photography. On the other hand, the TTArtisan 40mm F2 L maintains excellent clarity while controlling chromatic aberrations, making it suitable for everyday shooting. However, the Canon lens's advanced optical design may provide an edge in terms of overall image fidelity and character.

Pricing and Value for Money

In terms of pricing, the TTArtisan 40mm F2 L is about 64% cheaper than the Canon RF45mm F1.2 STM, retailing at $168.00 compared to Canon's $469.00. This substantial difference makes the TTArtisan a viable option for budget-conscious photographers who still want a quality lens. While the Canon lens offers superior features and performance, the value proposition of the TTArtisan cannot be overlooked, especially for those who prioritize affordability without sacrificing too much in quality.

Which should you buy?

The decision between the Canon RF45mm F1.2 STM and the TTArtisan 40mm F2 L ultimately depends on your specific photography needs and budget. If you are looking for a high-performance lens that excels in low-light conditions and offers exceptional image quality, the Canon lens is a worthy investment. However, if you're seeking a more affordable option that still provides solid performance for everyday photography, the TTArtisan lens is an excellent choice. Both lenses have their unique strengths, making them suitable for different types of photographers.