Burning the late night oil.
G1, 24mm, f/6.3, 1/30, ISO 400
Spotted late evening in Carmel, CA.
The G1′s iISO feature (intelligent ISO) determined the ISO 400 setting, presumably predicated on using a shutter speed no slower than 1/30 to avoid camera shake at the 24mm focal length. I was using aperture priority and chose the f/6.3 setting. iISO seems to settle on shutter speeds no slower than 1/30 at medium focal lengths, unless the light is so poor that an even slower shutter speed is called for. At 24mm (48mm full frame equivalent) the 1/30th is like 1/125th with the two stop gain in shake reduction owing to the OIS feature built into the lens. I have the ISO limit set at 800 as at 1600 the image really starts to break up.
The bottom line is that iISO does an excellent job of mitigating camera shake by adjusting ISO, to the extent allowed or possible.