No single film works in every situation. Some museums forbid flash photos because thousands of flashes can cause fragile materials to fade over time. So try a fast film with an ISO speed of 1000 or 1600. Such films are meant for flash-free, existing light photos that won't harm antique tapestries, fabrics or artworks. If your camera has a zoom or telephoto lens, a 400-speed film gives fine results.
Longer lenses require more light to register on the film.
Use them at sports events or locales where lighting is less than ideal. Many NSLR cameras have shutter speeds designed for mid-speed film in both flash and daylight conditions. The unpredictable excitement at America's theme parks calls for this type of film. Bright, sunny days on a cruise, at the shore or on the ski slopes call for you to try a 100-speed film that delivers good color. Sand, water and snow reflect and amplify sunlight.