A focusing screen is a ground glass or textured surface positioned at the image-forming plane of a camera, allowing the photographer to view and accurately focus the image before exposure. It provides a clear representation of composition, depth of field, and focus sharpness.
Focusing screens are commonly used in SLR, TLR, and large-format cameras, and they are essential for precise manual focusing. Some cameras offer interchangeable or specialized screens to assist with different photography types, such as macro, portrait, or architectural work, making it easier to achieve professional-quality results.