What commonly affects the exposure in photography when using different film isos?

Using different film ISOs primarily influences the sensitivity of the film or sensor to light, which in turn affects exposure. Exposure in photography is determined by three main factors: shutter speed, aperture size, and lighting conditions.

When you adjust the ISO rating of the film, you effectively modify how much light is required to achieve a proper exposure. A higher ISO setting means that the film or sensor is more sensitive to light, which allows for correct exposure in lower light conditions. Conversely, a lower ISO setting means less sensitivity, requiring brighter lighting or a longer exposure time to achieve the same exposure level.

The shutter speed plays a critical role in determining how long the film is exposed to light. If you increase the ISO, you may use a faster shutter speed to prevent overexposure. Likewise, a wider aperture size allows more light to enter the camera, and if the ISO is increased, you could also opt for a smaller aperture, adjusting the overall exposure appropriately.

Finally, the lighting conditions in the environment also dictate how much light is available for exposure. If you are shooting in dim light, a higher ISO might be necessary to achieve the desired exposure level, while in well-lit conditions, you might opt for a lower ISO.

Therefore, all these elements