What aperture setting should the camera be set to when following Tiller's Rule of Film Selection?

Tiller's Rule of Film Selection is a guideline used in photography that helps photographers choose the appropriate aperture based on the film speed being used. The rule suggests that for every doubling of film speed, you should stop down the aperture by one full stop in order to maintain equivalent exposure.

Choosing an aperture setting of f/8 aligns with Tiller's Rule, as it strikes a balance between depth of field and the exposure needs for a wide range of lighting conditions. This aperture provides enough depth of field to ensure sharpness throughout the image while also allowing adequate light to hit the sensor or film, particularly when dealing with standard film speeds.

In practical terms, f/8 is commonly seen as a "sweet spot" for many lenses, providing a good balance of sharpness and exposure. Photographers often prefer this setting for landscape photography and situations where a greater depth of field is desired, as it allows more elements in the frame to be in focus.

By selecting f/8, photographers following Tiller's Rule can effectively utilize the advantages of their film speed while ensuring their images are well-exposed and sharp.