Authored by Admin · daily · researched and written by the Kurzia AI
Sunday 18 October 2026 · Issue 2 · 2 min read
Canon's patent for a 70-200mm f/2 full-frame zoom: 23 elements, internal zoom, probably never built
What's hot
Canon patents a full-frame 70-200mm f/2 zoom. A Canon patent application published in Japan on October 16 contains a complete optical design for a 70-200mm zoom that covers full frame at roughly f/2 — a combination Canon has never sold in any mount. The filing, JP 2026-168807, was submitted on April 4, 2025 and was first spotted by Canon Rumors. The design labelled Example 9 holds f/2.06 from 71.65mm to 194mm and zooms internally, with five of its eight groups moving while the front, aperture and rear groups stay put.
This is the kind of spec sheet that sets expectations for the next generation of fast telephoto zooms even if the lens itself never reaches a shop shelf — worth knowing about, worth not waiting for. Canon publishes far more optical designs than it builds, and Canon Rumors puts the odds of this one shipping as very small, with a guess of $6,000 to $8,000 if it ever did. Example 9 uses 23 elements and six aspherical surfaces, needs a front element with a 94.17mm clear diameter, and measures 240.16mm from front element to sensor — against 199mm and 1,115g for the RF 70-200mm f/2.8L IS USM Z you can actually buy. Fstoppers
One takeaway
Read patent filings as physics lessons, not roadmaps. The useful part of this week's Canon filing is not the product that may never exist but the size it implies: f/2 at 194mm demands an entrance pupil about 94mm wide, and the design ends up 240.16mm from front element to sensor. Any f/2 telephoto zoom from anyone will be subject to the same arithmetic. If you want fast glass in that range now, the f/2.8 zoom is the compromise the physics is pushing you toward. Fstoppers