EXPOSURE is the quantity of light that is allowed through the camera lens and onto the photo film controlled by the intensity of light (through the aperture) and length of time (determined by the shutter speed). For correct exposure in a film camera, whether 35mm, medium format, or large format, it is essential that you correctly set both the shutter speed, the aperture, and the ISO (Film speed or sensitivity to record the light.
1. EXPOSURE & ISO
SECOND LOOK: Determining the best ISO when selecting your film.
2. EXPOSURE & THE APERTURE
SECOND LOOK: Determining needed intensity with the APERTURE & FOCAL LENGTH of the lens.
3. EXPOSURE & THE SHUTTER
Determining best length of time with the SHUTTER SPEED based on the film ISO.