Micdrow,
i think you are asking the question somehow wrongly.
The camera(-lens) gives a picture result based on these relationships:
The longer the focal length of the lens, the smaller the covered area. Also vice versa: The shorter the focal length, the bigger the covered area.
A decrease in altitude, results in smaller covered area, but in a magnification of details. An increase in altitude results in a bigger coverd area, but a loss in detail magnification.
So, depending on the task and the aircraft used, you would assign one or more cameras with varying focal lenses.
Example: a typical Lw recon. aircraft -i.e. a Ju 88 D1- could carry a typical load of upto three Rb 30s configurations like these:
•1 Rb 20/30 for overview, 1 Rb 50/30 for close-ups, 1 Rb 75/30 for details
or
•1 Rb 20/30 for overview, 2 Rb 50/30s for detailed (fanned) views / stereo views
Your "camera" is an aerial mapping/ recon camera useing a 18x18cm sized film of 10m length, approp. for ca. 50 photos. The focal length of this camera is 500mm. Other lenses were 100, 200 and 750mm.
Acc. to Dave Wademann in his engl. book "Aufklärer" this camera (Rb 50/18) was used at lower altitudes, because of it's faster shutter speed. How you interpret this, i have to leave to you.