It looks like the Sony a1 demonstrates some IBIS shake for a few seconds after being powered on for photos if the lens doesn’t have OIS and you bring the camera up from a resting (lowered) position. The problem occurs when powered off and on again in the photo mode, but doesn’t seem to affect video. Sony has acknowledged the issue is real, but they haven’t released a public statement.
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Sony A1: B&H Photo / Amazon / Moment / Adorama
via photoxels