Canon's New Patent Hints at a Potential 45mm Lens Evolution
Canon, renowned for its exceptional optics, is constantly pushing the boundaries of lens technology. Following in the footsteps of legendary lenses like the 50mm f/0.95 and the EF 200mm f/1.8L, the company is now making strides with a new patent that could redefine its popular 45mm lineup. This innovation addresses the persistent challenge of creating large-aperture lenses that are both compact and capable of superior chromatic aberration correction.
Canon's Latest Optical Innovation: A Deeper Dive into the 45mm f/1.2 Patent
On July 26, 2026, details emerged regarding Canon's patent number 2026119945, as reported by Asobinet. This patent describes an optical system that bears a striking resemblance to the existing RF 45mm f/1.2 STM lens but with notable deviations in specifications. These differences have sparked speculation: is this an early prototype, a new variant, or a glimpse into the future of Canon's lens offerings?
The core innovation of this patent lies in its attempt to deliver a wide aperture within a compact form factor while diligently combating chromatic aberration. The design is said to employ a double-Gaussian style optical formula, achieving a half-field-of-view between 20 to 30 degrees. However, this advancement comes with a typical optical trade-off: to correct image curvature, higher-refractive-index glass is necessary, which subsequently complicates the control of chromatic aberration. The proposed specifications for this patented lens are: a focal length of 46.35mm, an f-number of 1.22, a half-angle of 23.62 degrees, a likeness height of 20.27mm, a length of 55.45mm, and a back focus of 25.28mm.
A significant aspect of this potential new lens is its projected weight, estimated to be under 400 grams, making it considerably lighter than its predecessors. This, combined with the possibility of a more accessible price point (around or below the current 469 USD for the RF 45mm f/1.2 STM), suggests Canon might be aiming for a budget-friendly option without compromising on performance. The focal range of 46.35mm is close to the original 45mm, and its compact length of 55.45mm further underscores the emphasis on portability.
Industry observers are considering several possibilities for this patent: it could represent an early-stage design of the RF 45mm f/1.2 STM before its final optimization, a closely related yet distinct lens Canon considered in parallel, or even a precursor to a future, possibly L-series, variant that would cater to professionals seeking premium features like enhanced weather resistance.
The existing 45mm f/1.2 lens, despite its excellent performance at bright apertures and lightweight design, faces challenges with a lack of weather resistance and a slight drop in sharpness at f/1.2. The new patent could be Canon's answer to these issues, potentially offering a more robust and optically refined product.
However, as with all patents, there is a possibility that this design may never reach commercial production. Until concrete evidence of its development emerges, it remains a testament to Canon's ongoing research and development efforts in the photographic lens domain.
This patent filing serves as a fascinating insight into Canon's strategic thinking and its commitment to advancing lens technology. It highlights the intricate balance between optical performance, portability, and cost-effectiveness that manufacturers constantly strive to achieve. For photographers, particularly those on a budget or aspiring professionals, the prospect of a more affordable, lighter, and potentially weather-resistant 45mm f/1.2 lens is exciting. It underscores the continuous evolution of photographic tools, promising new avenues for creative expression and expanding the accessibility of high-quality optics.