One way some people have chosen is to measure the resolution in the aerial image formed by the lens. To do this a resolution chart is used as the target and the image formed in the film plane is examined by a microscope.
PROCESSING AERIAL FILM Because of the cost involved, the importance or urgency of the images, and the situations involved in obtaining aerial images, ...
when the screen is removed, it is an aerial image. The image seen through a telescope optical viewfinder, etc. cannot be focused on a surface without the aid of another optical system and is a virtual image.
A small lens was then used to magnify the aerial image from the Ektar. The illustrations in the article looked to be good quality.
Street map from Google Maps, or Yahoo! Maps, or Windows Live Local
Satellite image from Google Maps, Windows Live Local, WikiMapia
Topographic map from TopoZone
Aerial image or topographic map from TerraServer-USA ...
surprises await you when the three-dimensional world ends up on a flat screen, tube or print, minus one dimension. Tips: View the scene with one eye closed or through the lens of a camera; images on a ground-glass seem more 2D-ish than aerial images.
 See also: Image, Film, Light, Ground, Lens
  
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