Pick the camera you're shooting on, dial in a focal length and aperture, and choose the frame rate. The other cameras show you the lens settings that would give the same framing (angle of view) and the same depth of field.
Match Framing + DOF mode: shows what lens/aperture to use on the other two bodies to reproduce the shot.
Show FF Equivalents mode: shows the full-frame-equivalent focal length and aperture of the shot — handy when crews talk in FF numbers.
High frame rate & crop modes (DPReview studio test, CineD lab, Sony spec):
· A7S III 4K 120p: 1.10× effective
· A7 V 4K 60p: 1.00× (AoVP on, no NR) ↔ 1.17× (AoVP off, NR on)
· A7 V 4K 120p: 1.52× (AoVP on, S35 only) ↔ 1.79× (AoVP off, S35 + NR stack)
· A6700 4K 120p: 2.37× effective
· GH5S: no 4K 120p; FHD 120p has no extra crop → 2.00×
A7 V noise reduction toggle: Sony's "4K Angle of View Priority" toggle affects both frame rate modes. Default state (AoVP off / NR on) crops 1.17× at ≤60p and 1.79× at 120p. Flip it on (AoVP on / NR off) to recover the wider field of view at the cost of in-camera noise reduction — at 120p you still pay the base 1.52× S35 crop.
Math: ff_focal = focal × effective_crop, ff_aper = f × effective_crop.
Note: aperture scales DOF and total light gathered, not exposure — ISO/shutter behaviour is unchanged.