The document introduces the precautions for using wide-angle and ultra-wide-angle lenses, including not touching with wet hands, not leaving them unattended, not moving them while attached to a tripod, and storing them in a place without direct sunlight. It also mentions the precautions for using wide-angle and ultra-wide-angle lenses for autofocus shooting.
This manual covers the Nikon AF 20mm f/2.8D wide‑angle lens, describing its optical characteristics and proper handling. It includes multilingual notes on using the lens with autofocus systems.
The document explains situations where autofocus may struggle—such as small or low‑contrast subjects—and offers practical work‑arounds, including using focus lock and re‑composing or switching to manual focus (M). It also references the camera’s main instruction manual for further guidance. This manual is written in Japanese.
Autofocus can fail when the main subject in the focus brackets is relatively small or when the subject has low contrast or a strong pattern.
Set the camera’s focus mode selector to M (manual) and focus manually on the subject.