Using Filters and Attachments
Diffusion Filter
Star Filter
Diffraction Filter
Multi-Image Lenses
There are many dramatic effects you can obtain in your
pictures by using filters
and other lens attachments creatively. The use of color filters with
color
film can enhance or change the mood of a picture. You can use an orange
or magenta filter to suggest rich, warm sunlight of late afternoon in
your
color pictures. With a blue filter you can portray the somber, cool
effect
of twilight or moonlight while the sun is still above the horizon. You
can also use filters of other colors depending on the effect you want
to
create. Just look through the filter for a preview of how the scene
will
look in the picture.
Determining the exposure is easy when you use filters to give
the picture
an overall cast of color. Since you are altering the appearance of the
original scene and orange and blue filters are suggesting early or late
times of day, the exposure is not critical. Less exposure, which gives
darker pictures, implies dimmer lighting while more exposure, which
produces
lighter pictures, implies brighter lighting. Usually you can just
follow
the exposure indicated by a meter reading made through the filter. You
may want to bracket your exposures so that you have a choice of
brightness
in your pictures.
Dark-colored filters block a lot of light. These filters can
interfere
with the focusing of auto-focus cameras. If this is the case, you must
switch to manual focusing when you use these filters.
Most filters produce only one color. But variable-color
filters are
available that let you adjust the intensity of the color from light to
dark. Other variable color filters produce either of two colors or
various
shades in between-for example, yellow or red with shades of orange
between
the two extremes. Once you have a variable-color filter adjusted for
the
color you want, you can use it just like a conventional color filter.
You can obtain still other filters that are similar to
conventional
filters except that only half of the filter is colored while the other
half is clear. This feature lets you change the color in only part of
the
scene, like the sky.
Rather than using color filters, you can use other kinds of
filters
over your camera lens for a different approach to creative pictures.
These
filters are constructed with various optical properties that produce
effects
such as diffusion, pointed-star images, and streaks of light with bands
of color in them. It's easy to use these filters because you can see
the
effects you'll obtain when you view the scene through the filter. When
you use the filter over the lens on a single-lens reflex camera, you
can
see the effect through the camera viewfinder. With a camera that has a
direct optical viewfinder (non-single-lens reflex), you'll have to view
the scene through the filter first before putting it on your camera.
Diffusion Filter
A diffusion filter will give you a soft-focus, diffused image
which
portrays a subdued dreamlike effect. These filters come in various
degrees
of diffusion which produce effects ranging from a slight haziness to
pronounced
diffusion with a misty appearance, soft highlights, and merging colors.
Diffusion filters do not usually require any change in exposure unless
you want to produce a light, misty, or fog effect with a minimum of
dark
tones. Then you should try from 1/3 to 1-stop more exposure depending
on
the degree of diffusion in the filter. See the manufacturer's
instructions
for your filters.
Star Filter
Star-effect filters produce pointed star-like images of light
sources
and specular reflections that look like points of light in the original
scene. These filters create streaks of light that radiate outward from
the point of light. You can get 4-, 6-, and 8-pointed stars depending
on
the construction of the filter. By rotating the filter, you can change
the direction of the streaks of light. Usually no exposure increase is
required.
Diffraction
Filter
A diffraction filter is another filter you'll find useful for
creating
pictures that are out of the ordinary. Diffraction filters separate the
light from light sources and specular reflections in the picture into a
rainbow of colors in exotic patterns. Diffraction filters are available
from your photo dealer that form multicolored linear streaks of light
in
two, four, or several directions. Other diffraction filters form
different
multicolor patterns, such as a circular one. These filters too are easy
to use since you can see the optical effect when you look through the
viewfinder
of a single-lens-reflex camera with the filter over the lens. With
non-reflex
cameras, look at the scene through the filter while rotating the
filter.
When you see the effect you want, keep the filter oriented in that
position
as you put it on your camera. No exposure increase is required with
diffraction
filters.
Multi-Image
Lenses
For a different avenue to exciting and spectacular pictures,
experiment
with multi-image lenses. These lenses with multifaceted surfaces fit on
the front of your camera lens. The facets produce multi-images of the
scene
repeated in a straight row or arranged in a circular pattern. The
number
of images transmitted to your film may be 3, 5, or 6. These variations
in pattern and number of images produced depend on the construction of
the multi-image lens. You can rotate these lenses to obtain the most
pleasing
arrangement of the images in the picture. Since details surrounding the
subject are also repeated, multi-image lenses work best with subjects
against
plain backgrounds like the sky, water, or a dark background with little
detail.
Also, if you are using an autofocus camera, keep in mind that
since
multiple-image or other optical-distortion filters distort the light
entering
the lens, they will probably interfere with the ability of the camera
to
focus correctly. Therefore, you may find that both the camera and the
visual
effect are more easily controlled if you switch to manual focusing.
Creative uses of filters and lens attachments to make
intriguing pictures
are limited only by your imagination. When you take creative pictures,
there are no definite rules. Anything you find pleasing can be a
rewarding
picture. Many types of filters and lens attachments are available, so
it's
a good idea to explore the selection of this equipment at your photo
store.
One addition to the world of creative filtering that you might
want
to investigate are filter systems. With these systems, you buy a
screw-on
adapter bracket that fits your lens and a filter holder that mounts on
the adapter. The filters that go into these systems are usually acrylic
squares that give a wide range of creative effects, including all of
those
mentioned and more. The big benefit of using these systems is that even
if you have several lenses with different filter diameters, you need
only
an adapter for each lens. Since the filters themselves are all the same
size, you can use them on any lens. This will save you a lot of money
if
you have a variety of lenses with different filter sizes.
Back to photography tips main page.
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