A focusing cloth is a dark, opaque cloth used in view camera photography to block out ambient light while composing and focusing an image on the ground glass. By draping the cloth over the photographer's head and the camera back, it becomes easier to see the image clearly and achieve precise focus.
Focusing cloths are particularly useful for large-format and technical cameras, where accurate composition and sharpness are critical. They help reduce glare, improve contrast on the focusing screen, and allow photographers to carefully control framing and focus, ensuring high-quality, well-composed images.