Canon appears to be preparing an update to one of its most popular RF primes — the RF 35mm f/1.8 Macro IS STM. Patent filings suggest a redesigned version with internal focus, improved coatings, and multiple optical embodiments covering the 24–35mm range.
Patent Insights
The latest patent outlines four optical designs, all maintaining a constant f/1.85 maximum aperture and a 40mm image circle. Focal lengths range from 24mm to 35mm, suggesting Canon is exploring variations beyond the classic 35mm focal length. Notably, the designs are longer than the current RF 35mm f/1.8, but internal focus would eliminate the extending barrel issue.
Optical Improvements
- Internal focus mechanism — improves durability and balance.
- Fluorine coating on front and rear elements for easier cleaning.
- ASC (Air Sphere Coating) to reduce flare and ghosting.
- Macro performance remains at 1:2, consistent with the current version.
- Image stabilization included, matching the existing lens.
Design Considerations
The patent shows five optical groups, with only two moving for autofocus. This design could allow Canon’s latest STM motors to deliver faster, quieter focusing. By sandwiching the moving groups between stationary ones, distortion and image quality may be improved.
Editorial Insight
The RF 35mm f/1.8 Macro IS STM has been a staple for EOS R shooters since 2018. Compact, affordable, and versatile, it quickly became a go‑to prime for travel, street, and everyday photography. An updated version with internal focus and modern coatings would address long‑standing user requests, making it even more appealing for creators who value portability and performance.
Explore Canon’s current lineup:
- Canon RF 35mm f/1.8 Macro IS STM
- Canon RF 50mm f/1.8 STM
- Canon RF 85mm f/2 Macro IS STM
- Canon RF 24mm f/1.8 Macro IS STM
- Canon EOS R8
- Canon EOS R6 Mark II
- Canon EOS R50
- Canon PowerShot V10
Shop Canon Cameras & Lenses
Check Canon RF 35mm f/1.8 Macro IS STM II Prices
Buy Canon RF 35mm f/1.8 Macro IS STM II
View Canon RF 35mm f/1.8 Macro IS STM II Listings
Tip: Compare the rumored RF 35mm f/1.8 Macro IS STM II with the RF 50mm f/1.8 STM and RF 85mm f/2 Macro IS STM to decide your next prime lens upgrade.
Summary
Canon RF 35mm f/1.8 Macro IS STM II is rumored to feature internal focus, improved coatings, and refined optical design. With patents showing multiple focal length embodiments, Canon may be preparing a versatile refresh of one of its most popular RF primes. Positioned as an affordable, compact lens for EOS R shooters, the update could arrive in the near future.
For broader context, see our Canon Rumors hub, the Canon EOS R system guide, and our best Canon RF lenses roundup.
Stay tuned to our Canon News and Canon Rumors hub for updates.
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via: Canon Rumors & Japanese Patent Publication No. 2026-090068
