Get The Most Out Of Your Camera. (Part 1).
Would you like to take wildlife pictures like you see in
magazines, or even turn everyday objects into photographic art?
Did you ever see an image where only a small part of it is
sharp? Using the aperture ring correctly can maximise the
artistic look of your image.
Not only does it determine the depth-of-field, it also has the
power to direct the human eye.
The human eye is instinctively drawn towards noticeable points
of an image. These are usually the sharpest and most important
parts of an image. Using a wide aperture to limit the area of
sharp focus can direct attention to the most important elements
of your image and blur out any off-putting backgrounds.
This isn't that hard to accomplish, and can be blissful if done
correctly.
Lets start off with understanding depth-of-field, aperture and
f/stops.
Depth-of -field: The distance from the front to back that is in
reasonable sharp focus is called the depth-of-field. There are
two ways of controlling depth-of-field: Use a small aperture or
focus on a point farther away from your camera.
Aperture and f/stops: The aperture is an opening in the centre
of the lens through which light passes. The amount of light,
which passes through an aperture, is indicated by f/stops. The
lower the f/stop the more light that passes through the
aperture. Opening up one full f/stop doubles the amount of light
entering the camera. F/4 admits twice the light of f5.6.
By selecting a small or narrow aperture (f/16 or up), all or
most of the scene will be reasonably sharp. This is ideal for
landscape photography. By using a small aperture you increase
the depth-of-field.
By selecting a large or wide aperture (f/5.6 or below) you
decide which part of your image is sharp. This is ideal for
taking pictures of wildlife, portraits, sport and small objects.
By using a large aperture you decrease the depth-of-field
The smaller the f/number, the wider the aperture.
There is about twice the depth-of-field behind the point of
focus as there is in front of it, using any aperture.
Now you know how to isolate your subject, so it's time to put it
to use. Set your camera to aperture-priority (AV) mode, and then
select a large aperture (f/2 - f/5.6). By doing this the camera
will select the shutter speed automatically. If you are shooting
wildlife choose a low viewpoint to maximise the image, try
putting the camera lens at eye-level with the subject.
While the above will help to isolate you subject, it's only a
start. Know your subject, especially when shooting wildlife.
Don't be fooled into thinking all elements of an image must be
sharp to be considered a good photo.