This article is from the Gross
Specimen Photography, by Ed Uthman, MD
This is essentially the problem of balancing the amount of light coming through the lens with the sensitivity of the film. We seek the ideal exposure and eschew the underexposure (slide too dark) or overexposure (slide too light). The determinants of exposure are:
A. Film Speed
B. Aperture
C. Exposure Time
 
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