Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 391

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
Aperture Preview
While you press and hold the key to which you assigned the [Aperture Preview] function, the aperture is stepped down to
the set aperture value and you can check the blurriness prior to shooting.
MENU → (Camera Settings2) → [
1
desired key.
Confirm the image by pressing the key to which [Aperture Preview] was assigned.
2
Hint
Although you can change the aperture value during the preview, the subject may be defocused if you select a brighter aperture.
We recommend that you adjust the focus again.
Related Topic
Custom Key (still image/movie/playback)
Shot. Result Preview
Custom Key] → set the [Aperture Preview] function to the
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