Angle of view camera–subject distance to preserve the size of a subject, changing the angle of view can indirectly distort perspective, changing the apparent relative size of the subject and foreground. If the subject image size remains the same, then at any given aperture all lenses, wide angle and long lenses, will give the same depth of field. An example of how lens choice affects angle of view. This table shows the diagonal, horizontal, and vertical angles of view, in degrees, for lenses producing rectilinear images, when used with 36 mm × 24 mm format (that is, 135 film or full-frame 35mm digital
The Octagon House was occupied by 10 families, probably one living in each room, tenement-apartment-style. The residents were probably mostly workers in the factories that populated Foggy Bottom. In 1898, the American Institute of Architects (AIA) selected the Octagon to be their new national headquarters. They rented the building for 4 years, and then purchased it outright in 1902. The Octagon would continue to serve as AIA's headquarters until the construction of the current headquarters building in the 1960s. The Octagon opened as a museum in 1970. The museum was restored to its 1817–18 era appearance in the early 1990s—the wall colors and