Native EF and EF-S mounting on these Canon DSLRs

When it applies

Use the exact Canon EF or EF-S lens named in the configuration.
Attach the lens directly, with camera power off and the matching mounting index aligned.
No adapter, extender, extension tube or mount modification.

Where it stops

The 5D Mark IV does not accept EF-S lenses.
This rule does not establish autofocus-point coverage, stabilization strength, video behavior or firmware parity.
The 90D guide used here covers firmware 1.1.0 or later.

Sources

EOS 90D Advanced User Guide (eos90d-ug5-en.pdf) — Cover; printed pp. 54–55, 114–115, 124–126, 135–143, 158–159, 202–203, 266. Current download resolved from Canon India support issue 0303714001. Downloaded and text-read on the research date. The guide explicitly covers camera firmware 1.1.0 or later; that is documentary scope, not a claim that 1.1.0 first enabled ordinary lens operation. Lens-specific usable AF-point counts were not established. Read 2026-09-07.
EOS 5D Mark IV (WG) Instruction Manual (eos5d-mk4-im10-en.pdf) — Printed pp. 55, 100–102, 115, 124, 248–249, 253–254, 310, 314–315, 574, 576. Downloaded and text-read. PDF page numbers are printed page plus two. EF24-70mm f/2.8L II USM is explicitly Group A. EF70-200mm f/2.8L IS III USM was not found in the table; the IS II row is not evidence for III. No camera firmware version scope was identified for these still-photo instructions. Read 2026-09-07.
EF-S10-18mm f/4.5-5.6 IS STM Instructions — Printed ENG-1, ENG-6, ENG-8, ENG-11; PDF pp. 2, 7, 9, 12. Exact STM lens manual downloaded through Canon Taiwan support issue 0301542501. Its old camera list is dated March 2014; the later 90D body manual supplies EF-S acceptance. The four-stop IS figure uses EOS 7D, not 90D, and is not transferred here. Read 2026-09-07.
EF-S18-135mm f/3.5-5.6 IS USM Instructions — Printed ENG-1, ENG-7–8, ENG-10, ENG-14; PDF pp. 2, 8–9, 11, 15. Exact USM version downloaded and text-read; not the older IS or IS STM model. Lens manual describes AF/MF, optical IS switch and variable aperture. Its 2016 camera list is older than EOS 90D; the 90D body manual and dedicated Panning advisory establish the later model context. Read 2026-09-07.
EF50mm f/1.8 STM Instructions — PDF p.1 precautions and mounting; PDF p.2 section 2 Setting the Focus Mode and bottom Specifications table.. Exact EF STM manual downloaded and text-read. Manual focus requires camera power; full-time manual adjustment is described for One-Shot AF. The lens manual does not specify a firmware version. Read 2026-09-07.
EF24-70mm f/2.8L II USM Instructions — Printed ENG-1, ENG-5–6, ENG-11; PDF pp. 2, 6–7, 12. Exact II model downloaded through Canon Asia issue 0300787802. Describes camera-controlled aperture, focus switch, One-Shot manual override and f/2.8 to f/22 specifications; no extender is included in this packet. Read 2026-09-07.
EF70-200mm f/2.8L IS III USM Instructions — Printed ENG-1, ENG-6–7, ENG-10–12, ENG-17; PDF pp. 2, 7–8, 11–13, 18. Exact IS III manual downloaded through Canon Asia issue 0303111301. Establishes AF/MF, focus limiter, camera-controlled aperture and IS modes 1 and 2. Recommends current camera firmware but gives no numeric prerequisite for 5D IV. Read 2026-09-07.

Pairs checked under this rule

Only these pairs were checked. The rule does not extend to other gear on its own.

Researched from manufacturer documents by an AI agent and source-checked 2026-09-07. How the research works