Common
Terms used with Macro Photography and Lenses
USM and inner focus Quiet, fast autofocus action.
Convenient for close-up situations. When you
want to photograph a small animal or an insect, it's important to get
close quietly - without scaring the subject. Canon Macro Lenses
with USM and inner focus let you photograph subjects with quiet, rapid
autofocus. You'll feel confident to approach many subjects that
are sensitive to sound and motion in the big world around them. You'll
be able to get close and capture big, bold images of the small worlds!
Full time manual focus Fine-tune the focus while in AF mode.
Macro photography can only focus on a small area. The impression of a photograph changes dramatically by making a small shift in the point. Use autofocus, and then turn the focus ring. When you keep your attention on the viewfinder and fine-tune the focus, the difference in the finished photo will be immediatly apparent.
Tripod mount ring Change the vertical/horizontal framing instantly without altering the subject.
Perhaps you shoot a horizontal composition,
then feel like taking a similar photo in a vertical framing. With
a regular tripod, the subject position through the viewfinder inevitably
shifts and the photographer has to refocus from the start. With
a tripod mount ring, however, you can maintain the position of the
subject in the viewfinder - for an easy, instant frame change to a
vertical, horizontal, or even an angled composition.
Magnification
Ratio This ratio expresses the relative size of the image, compared to the subject.
The larger the magnification
ratio, the larger the subject appears.
The magnification ratio indicates the ratio of image size captured on sensor or film to the actual size of the subject. When using a magnification ratio of 1x, for example, the image captured on the sensor or film is the same size as the subject. The maximum magnification ratio represents the largest image size of a subject captured by the lens. The maximum magnification ratio for standard lens EF-S 18-55mm F3.5-5.6 II USM is 0.28x (at 55mm) while the maximum magnification the EF-S60mm f/2.8 Macro USM lens is 1x.
Focal Length A number related to the angle of a
lens .
The longer the focal length, the greater the
telescopic effect, the narrower the angle of view.
In other words, 100mm or 180mm macro lenses
have narrower angles of view than a 60mm lens. So if you're shooting
the same subject from the same distance, the subject appears larger
with a 100mm or 180mm macro lens.
The shorter the camera to subject distance,
the greater the blurring in front and back of the focused area.
Aperature Control depth of field, depending
on how wide the aperature diaphragm is opened.
Aperature control for desired background blurring
An aperature diaphragm is a mechanism that
controls the amount of light entering a camera through the lens. By
adjusting the opening of the aperture, one can vary the depth of the
zone of in-focus elements. If the aperture is wide open (f/2.8,
for example), the focused area becomes shallow, resulting in greater
blurring of images, in front of and behind the subject in focus. In
contrast, if the aperature is small (f/22, for example), the focused
area becomes deep, resulting in greater clarity of images in front
of and behind the subject in focus.
Canon Macro Lenses offer lots of ingenious features to
help you turn good ideas into great shots - easily.
You can use a macro lens to capture images as you imagine them. Discover
the pleasure of taking pictures with a Canon Macro Lens!
