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A polarizing filter virtually eliminated reflections for this shot (but isn t always so effective).
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CHAPTER 4: Exploring Product Photography and Other Still-Life Adventures
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lens at a 90-degree angle to the sun an arrangement that happens to optimize the effect of a polarizing filter. If you re new to polarizing filters, here are just a few other basics you need to know:
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Two types of polarizing filters exist: linear and circular. Autofocus cameras
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require circular polarizers.
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A polarizing filter has a movable outer ring that you twist to find the position
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of maximum polarization. Depending on your camera, you may not be able to see the effect in the optical viewfinder; you may need to preview the shot in the camera monitor instead.
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A polarizing filter reduces the amount of light your camera sees. If your
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camera has through-the-lens (TTL) autoexposure metering, as do most newer digital cameras, you shouldn t have to worry about making exposure adjustments; the autoexposure system will make the adjustment automatically. But some inexpensive cameras don t meter the light through the lens itself, which means that you need to tweak exposure manually when you use a polarizer. Check the filter box or package insert to determine the filter factor and how much exposure adjustment the manufacturer recommends. (See 1 for more details about this topic.) You may or may not be able to preview the filter effects in the monitor on this type of camera. Moral of the story: Always bracket exposures to be safe.
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Some autofocus mechanisms are thrown off by polarizing filters. If you have problems, try this trick: Before you twist the polarizer to find the best position, press and hold the shutter button halfway down to set the focus. Then move the polarizer as needed and press the shutter button the rest of the way. If you re in autoexposure mode, however, keep in mind that exposure is also set with your half-press of the shutter button. So you need to raise the EV compensation value a notch or two before you start the process.
1 offers tips on buying polarizers and other filters for digital cameras.
Shoot Like a Pro!
How Does a Polarizing Filter Work
When rays of sunlight hit some reflective surfaces, including glass and water, they bounce off the surface and vibrate in a single plane. This reflected light, which is said to be polarized, causes glare. A polarizing filter allows you to screen out polarized light reflections, thereby eliminating glare. This gatekeeper duty is performed by rows of tiny crystals, which work like slats in a window blind to prevent light that s coming from certain angles from entering the camera. The visual effect is just like putting on a pair of sunglasses that have polarizing lenses. You can t just pop a polarizing filter on your camera and wait for the magic to happen, however. First, you must position the camera lens at a certain angle with respect to both the sun and the reflective surface. For maximum effect, you need to shoot the object from a side angle of about 30 to 35 degrees, with the lens at a 90-degree angle to the sun. You then need to twist the outer ring of the filter until the rows of crystals are aligned with respect to polarized light rays that you want to eliminate. Depending on your camera, you may be able to preview the effect in your camera s monitor or even in the optical viewfinder. If not, just hold the filter up in front of your eye until you find the right position. In addition to reducing glare, polarizing filters have an added use for outdoor photography: they can make skies appear bluer. 8 talks more about this benefit.
Photographing Glass
Two of the most common questions I field from people who are new to product imagery relate to glass and art: How do you photograph framed art that s under glass And how do you photograph glass that is the art So before setting aside the subject of reflective objects, I want to devote a few paragraphs to answering each question.
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