The Pentax FG-40 Focusing Screen is an interchangeable focusing screen compatible with SF-series cameras. It features a matte field with penciled grid lines (6mm² squares). Ideal for architectural and other precision photography.
Three screens were available in addition to the standard one: FD-41 (Scale matte Screen for Photomicrography and macrophotography), FG-40 (AF sensor field surrounded by a grid) and FI-40 (AF sensor with a horizontal and a vertical millimeter scale). Both screens are well suited to scientific, architectural, and macrophotographic work.
![Pentax Focusing Screen](https://fovi.no/file/thumb/file/9/968371&width=586&height=832&zwidth=586&zheight=832&x=293&y=416.jpg)