It is possible to change the ISO on a film camera. ISO is a measure of a film's sensitivity to light, and changing the ISO can affect the exposure of the image.
To change the ISO on a film camera, one must first determine whether the camera has a built-in ISO setting or if it requires changing the film. Cameras with built-in ISO settings will typically have a dial or button that allows the user to adjust the ISO.
If the camera does not have a built-in ISO setting, then the user must choose a different film with a different ISO rating. The ISO rating is typically indicated on the packaging of the film and can range from as low as 25 to as high as 3200 or more.
It is important to note that changing the ISO can have a significant impact on the resulting image. A higher ISO will make the film more sensitive to light, allowing for faster shutter speeds and better performance in low light conditions, but it can also result in more grain or noise in the image. A lower ISO will make the film less sensitive to light, resulting in slower shutter speeds and potentially lower quality images in low light conditions, but with less grain.
In conclusion, changing the ISO on a film camera is a simple process that can have a significant impact on the resulting image. It is important to understand the effects of changing the ISO and choose the appropriate ISO for the lighting conditions and desired image quality. Sources for further reading and guidance on ISO include camera manuals and photography websites and books.