Focal length is the distance from the middle of the camera lens to the focal plane (i.e. the film). As focal length increases, image distortion decreases. The focal length is precisely measured when the camera is calibrated.
Simply defined, scale can be expressed as the ratio or proportion between a distance on the aerial photographs (or maps) and the actual distance on the ground or land surface.
The National High Altitude Photography (NHAP) program was initiated in 1980 and coordinated by the U.S. Geological Survey to acquire aerial photography of the 48 conterminous United States every 5 years.
Simply defined, scale can be expressed as the ratio or proportion between a distance on the aerial photographs (or maps) and the actual distance on the ground or land surface.
The majority of USGS aircraft photography is used for cartographic purposes. Image distortion is minimized when photographs are acquired looking straight down or vertically.Learn more:
Yes.  Scanning of the EROS film archives is following a plan to capture images from rolls at risk of decay from vinegar syndrome. Science requirements are also reviewed on a regular basis, but a formal, on-line schedule is not available at this time.
The high resolution orthophoto and the Digital Orthophoto Quadrangle (DOQ) provides the most detail. You would probably be able to identify your neighborhood.