Protect your film from overexposure. Highly sensitive emulsions (400 ISO and above) require fast shutter speeds and high apertures in intense light; otherwise, your photo will be overexposed. With COKIN neutral gray filters, which perfectly reproduce colors, you can gain 3 stops that would otherwise be lacking for backgrounds, distance, or depth of field. Additionally, using neutral gray filters allows for slower shutter speeds, reflecting the visual contrast between movement on the street and the stillness of your subject.