Panasonic LUMIX DMC-G85 Operating Instructions For Advanced Features page 90

4. Focus, Brightness (Exposure) and Colour tone Settings
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If you zoom in/out after focusing on a subject, the focus may lose its accuracy. In that case,
re-adjust the focus.
Subjects and recording conditions which are difficult to focus
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Fast-moving subjects, extremely bright subjects or subjects without contrast.
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When recording subjects through windows or near shiny objects.
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When it is dark or when jitter occurs.
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When the camera is too close to the subject or when taking a picture of both distant and near
subjects.
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