Page 122 - (DK) Advanced Photography Guide

120 INTRODUCING |

FILTERS

Made from glass, optical resin, or plastic, filters adjust the light that passes

through them in ways specific to each type. Filters are not necessary for all types

of photography, but they are invaluable for controlling contrast when shooting
landscapes. They also can be used to create effects that would be impossible to

achieve otherwise, such as extending shutter speeds to blur movement.

Filter systems

Filters are either circular and are screwed onto a The most popular size takes 100mm filters, though
lens filter thread, or are square/rectangular and slot larger and smaller systems are also available. Filter
into a filter holder. Screw-on filters are available in holders are clipped to an adapter ring that is screwed
many sizes, determined by the filter thread size of to the lens. To use the filter holder on other lenses,
the lens. There are several filter-holder systems. you will need to buy more adapter rings.

SCREW-ON FILTERS FILTER HOLDERS

ADVANTAGES ADVANTAGES

◾ ◾ Cheap and widely available ◾ ◾ Can be used on a wide range of cameras and lenses
◾ ◾ Wide choice of filter types using adapter rings
◾ ◾ ND graduated filters can be positioned precisely
◾ ◾ Can be used to protect the front element of the lens
DISADVANTAGES DISADVANTAGES
◾ ◾ You may need more than one filter for multiple lenses ◾ ◾ Initial expense of the filter holder and adapter rings
◾ ◾ They cannot be stacked together easily ◾ ◾ They restrict the use of lens hoods
◾ ◾ ND graduated filters (see right) are fixed in place ◾ ◾ May cause vignetting with wide-angle lenses

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