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How to Use a Spot Filter

Spot filters are specially made circles of glass than can be directly attached to SLR (single lens reflex) and DSLR (digital single lens reflex) cameras. A spot filter is a special effects filter that acts much like a diffusion filter, except that the device is center-weighted. Light passing through the center of the filter is unaffected, while on the perimeter, the glass is altered so that it breaks up the light. Spot filters are manufactured by many companies and display many different optical effects.

Things You'll Need

  • SLR or DSLR camera
  • Lens diameter measurement
  • Spot filter
  • Can of compressed air
  • Isopropyl alcohol
  • Disposable lens tissue
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Instructions

    • 1

      Look up the diameter of your camera lens. Many times it can be found printed on the rim. This is not the same number as the focal length, but rather it is an accurate measurement of the distance across the face of the lens. In most camera lenses, this value should run between between 45mm and 55mm. If you have a skylight or UV filter installed on your lens, just note the size for that filter.

    • 2

      Decide which spot filter you want to buy. This is important because the effects of each one varies. To make an informed choice, research magazine articles and find material where the visual effects of each lens are previewed via printed images.

    • 3

      Buy the spot filter, then clean it with a can of compressed air. If more cleaning is necessary, you can use isopropyl alcohol and lens tissue. Always discard lens tissue after using.

    • 4

      Install the filter on your camera lens by gently placing the filter flat against the lens and turning the filter ever so gently. Once the threads of the filter catch, keep turning until the filter rests snugly against the camera lens or protective filter.

    • 5

      Shoot some pictures. Excluding the radial zoom, a spot filter might work well for capturing one subject at a range of 5 feet to 15 feet. Some ideas of possible shots include a portrait of a friend or family member, your pet, a figurine, a flower arrangement, or a still life .


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