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Think it isn't possible? Kodak makes a film primarily for the scientific market that is fun for 35mm photographers to try, too. It is Kodak High Speed Infrared Film, a black & white film that can be shot with most any 35mm SLR camera and is processed like conventional B&W film. Infrared photos show trees, shrubs and other foliage as light tones, while bodies of water appear dark. The effect is fairly subtle if a filter is not used, but it becomes much more vivid when a filter is added. Many subjects have a ghost-like glow about them that adds to the distinctiveness of infrared photos. What is infrared light? For starters, the spectrum of visible light extends from about 400 nanometers (violet) to 700 nanometers (red). All the colors of light that we can see fall within this 400 to 700 nm range. Below 400 nm is ultraviolet light and above 700 nm is infrared. While conventional B&W and color films pick up UV light, they are not sensitive to infrared. Infrared film is sensitive to visible and infrared light, but a filter can be placed over the camera lens (or the light source, if a flash or other light is used), to block some or all of the visible light. A No. 25A red or No. 29 deep red filter will block some visible light, while a No.87 filter appears black and blocks all visible light while transmitting infrared. This film is listed on p.4 of Porter's A-68 Catalog: a pamphlet giving more information on infrared photography is on p.98.

WHICH TYPE OF POLARIZING FILTER SHOULD I BUY?
A polarizing filter is great for improving the richness of colors and eliminating reflections. If you've shopped our catalog or web store for a polarizing filter, you've seen that we carry two types, linear and circular polarizers. Linear polarizers are the traditional type and work fine on manual focus cameras. But if you use an autofocus camera, you'll need a circular polarizer instead. While they look the same and produce the same improvements in your pictures, a circular polarizer is the type that is compatible with your camera's autofcus system. (A linear polarizer may prevent the autofocus system from working properly, causing out-of-focus pictures.) If you have both a manual focus and an autofocus camera, a circular polarizer will work fine on either camera.