What is a common film size in traditional film photography?

In traditional film photography, 35 mm is a standard film size that was widely adopted for both amateur and professional use. This format gained popularity because it strikes an ideal balance between image quality and portability, allowing photographers to capture high-resolution images while also making it convenient to handle and transport. The 35 mm film frame measures 36 mm x 24 mm, which fits well in most camera designs, leading to its extensive use in various photography genres, including portraiture, landscape, and street photography.

The other options represent measurements that are less common in traditional film photography. For instance, 24 mm typically refers to a lens focal length rather than film size, while 50 mm is also a lens focal length that is well-known for its versatility in photography but does not pertain to film size. The 100 mm measurement, similarly, is associated with a lens focal length, particularly used for macro or portrait photography, rather than serving as a film standard.