Canon has unveiled a patent for next-generation optical design technology aimed at dramatically reducing lens weight while boosting autofocus (AF) speeds.
According to global news outlet CanonRumors, a recently published Japanese patent filing (JP 2026-122508) reveals 21 distinct variations of a '3-Group Lens Design' developed by Canon. The core aim is to significantly reduce the mass of the internal focusing element to achieve ultra-fast AF operation.
Here is a technical overview of the patent's core principles and its implications for future RF-mount lineups.
1. Core Concept: Overcoming Physical Limits of AF Speed via Lightweight Focus Groups
- The Link Between AF Speed & Lens Element Mass: Autofocus response time is heavily influenced by the weight of the lens group moving internally during focusing. Canon’s research focuses on optical configurations that minimize the mass of the focus group, reducing motor strain and power consumption.
- Structure of the 3-Group Optical System:
- Front Group: A stationary group consisting of 4 elements that handles light dispersion.
- Middle Group (Focus Group): The centerpiece of the patent—only this compact middle element moves to achieve focus. Moving a lightweight element before light converges allows for extremely swift acceleration and deceleration.
- Rear Group: Houses the aperture diaphragm and rear elements to converge light onto the sensor plane while correcting aberrations.
2. Notable Optical Examples from the Patent (21 Examples Included)
- 14.4mm F2.0 (Overall Length: 75.7mm): An ultra-wide prime design featuring the shortest total length (75.7mm) among the patent embodiments.
- 12.2mm F1.23 (Overall Length: 149.7mm): A next-generation ultra-wide concept combining an extreme field of view with an ultra-fast aperture.
- 14.6mm F1.4 & 20.5mm F1.85: Fast-aperture designs engineered to minimize focusing element travel distance.
✍️ Editor's Note
"Rather than a blueprint for a single specific production model, Canon's latest patent presents an 'optical design formula' intended to revolutionize AF drive speeds and compact sizing across future lenses! By drastically cutting down the weight of the internal optics moved by the AF motor, Canon demonstrates a clever approach to improving both energy efficiency and focus responsiveness. Even if extreme examples like a 12mm f/1.2 don't hit production immediately, seeing this 3-group focusing mechanism implemented in smaller, lightning-fast RF primes will be exciting to watch!"
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