Cross-brand camera mount × adapter compatibility matrix

Reading the matrix

What does the 'Mechanical' badge actually mean?

A plain machined-metal adapter with no glass and no electronic contacts. The lens physically attaches to the body and reaches infinity focus, but the camera has no way to communicate with the lens — autofocus, in-lens image stabilization, and electronic aperture become manual. Aperture-ring lenses still work normally; aperture-by-wire lenses (most modern EF, F, A-mount) need an adapter with a built-in aperture-control wheel.

Why is a combination marked 'impossible'?

Two reasons. First, mirrorless lenses cannot be mounted onto DSLR bodies — the lens is engineered for a flange distance shorter than the body's mirror box, so the rear element collides with the mirror. Second, when the flange-distance deficit exceeds about 12 mm, no commercially available focal reducer (Speed Booster) has enough correction range to restore infinity focus.

Why does 'AF partial' show up on the EF → Z and F → Z rows?

Either some lenses in the family lose autofocus (the FTZ II cannot drive screw-drive AF-D lenses; they revert to manual focus with focus confirm), or autofocus is preserved but slower and more glitch-prone than native — typical of smart EF adapters on Sony / L-Mount / GFX. The per-mount detail pages explain the specific scope.

Does a Speed Booster preserve autofocus?

It depends on the adapter and the body. Metabones' Speed Booster XL for Canon EF → MFT preserves contrast-detect AF on most Olympus / OM System and Panasonic bodies. Sony E variants vary by body generation (phase-detect AF works on PDAF-capable bodies, contrast-detect on older A7 generations). Pure mechanical focal reducers from no-brand vendors lose AF entirely.

Are the adapter SKUs in each cell exhaustive?

No — each cell names the most reputable adapter(s) for that combination, not every adapter sold. Cells where smart adapters exist (EF → RF, F → Z, A → E, EF → E, EF → FX, EF → L, EF → GFX) list the names users actually search for. Less popular combinations show 'generic mechanical adapter' because there's no canonical SKU.