The adapted lens retains focus and optical IS, and the R5 Mark II manual documents combining camera and lens stabilization. Exact-table burst eligibility does not guarantee sustained 30 fps during focus or zoom changes.
- Connection
- Canon Mount Adapter EF-EOS R
- What was checked
- Stills: mounting, AF, Tv aperture/exposure control, combined camera/lens IS and conditional electronic H+ burst.
- Sources checked
The next source check for this pair is overdue. Next source check due .
Physical connection
SupportedEF 70-200mm f/2.8L IS III USM attaches to EOS R5 Mark II through the standard Canon adapter.
- Canon Mount Adapter EF-EOS R; no extender
- Lock lens to adapter, then adapter to camera
Autofocus
SupportedBasic autofocus is supported with the adapted EF 70-200mm f/2.8L IS III USM.
- Lens focus switch AF
- Stills; no AF speed or coverage guarantee
Aperture control
SupportedCamera aperture control is retained: Tv selects aperture automatically after the photographer chooses shutter speed.
- Stills in Tv
- Blinking aperture warns that shutter or ISO needs adjustment
Stabilization
SupportedThe camera manual documents combining camera and lens stabilization when an IS-equipped lens's IS switch is On; the adapter retains optical IS.
- Set the lens IS switch On; that switch governs IS rather than the unavailable body IS menu
- No exact stop rating or RF-style coordinated-control performance inferred
Continuous shooting
LimitedThe exact lens appears in Canon's maximum-speed table. R5 Mark II electronic H+ is rated up to 30 fps, with operating limits.
- Electronic H+ at its default maximum-rate setting, shutter 1/250 sec or faster, flicker reduction off. Electronic shooting rates can be customized.
- LP-E6P or DR-E6P; other power sources can lower speed.
- Zoom, manual focus, Servo AF, aperture changes and other conditions may lower speed; buffer duration not verified.
- Switching to P or Tv, or applying settings that change aperture in Fv, may lower the continuous shooting speed.
Not covered by the sources
- No hardware tests were performed. AF tracking accuracy, acquisition speed and lens-specific AF-area coverage remain unverified.
- Lens and adapter firmware versions were not specified in the reviewed evidence; no all-version compatibility claim is made.
- Video, extender use and lens-correction behavior were not investigated.
- Camera 1.3.0-or-later records the reopened guide's scope, not an introduced adapter-compatibility threshold.
- Exact IS effectiveness at each focal length, panning/tripod IS behavior and sustained buffer performance remain unverified.
Sources and review notes
Firmware in scope: camera 1.3.0 or later, lens not stated, adapter not stated. “Not stated” means the documents do not give a version range. It does not mean every version works.
Researched 2026-09-07 by an AI research agent reading the documents below, then source-checked 2026-09-07. Nobody has tested this pair by hand. How the research works
- EOS R5 Mark II: Attaching and Detaching EF/EF-S Lenses — Attaching and Detaching EF/EF-S Lenses; introduction and step 4. Exact body adapter instructions and AF/MF switch condition. Accessed 2026-09-07.
- EF 70-200mm f/2.8L IS III USM product information — Highlights; Overview; Benefits. Exact EF lens identity and optical Image Stabilizer. Advertised lens stop figure is not applied to the adapted configurations. Accessed 2026-09-07.
- Canon RF Lens World: Mount Adapter EF-EOS R — Mount Adapter EF-EOS R; adjacent specification and exclusions footnote. Standard adapter retains EF lens AF, lens IS, and camera dial operations. The footnote warns that some EF lenses lack certain functions; it is not an all-features or equal-speed guarantee. Accessed 2026-09-07.
- EOS R5 Mark II: Tv: Shutter-Priority AE — D305-035; opening paragraph, steps 1-4 and Caution. Tv automatically selects aperture after shutter is chosen. Flash, video and transient aperture response are outside this evidence. Accessed 2026-09-07.
- EOS R5 Mark II: Image Stabilizer (IS Mode) — D305-072; opening paragraph and Caution. With an IS-equipped lens, lens IS switch On combines lens and camera stabilization. Camera IS menu unavailable with lenses having an IS switch. No exact stop rating. Accessed 2026-09-07.
- Lenses Supporting Maximum High-Speed Continuous Shooting Speed — H001-009; May 2026 camera table and EF lens table. Names R6 Mark II, R8, R5 Mark II and all three exact EF lenses. RP is not listed. Inclusion is eligibility for stated body modes; actual speed depends on body manual conditions. Accessed 2026-09-07.
- EOS R5 Mark II: Selecting the Drive Mode — D305-133; High-speed continuous shooting + and Caution. 30 fps electronic requires at least 1/250 sec and no flicker reduction; power source, zoom, aperture and AF changes can lower speed. Accessed 2026-09-07.
Related rules: Standard Canon adapter preserves documented EF lens functions →