How Your Camera Lens Works Focusing Options Make sure to

How Your Camera Lens Works Focusing Options Make sure to
How Your Camera Lens Works
Focusing Options
Make sure to activate your focusing grid so that you are able to control which part
of the image you wish to focus upon.
M – Manual – Using the camera’s focusing ring to achieve proper focus
S – Single – Auto focus is attempted when the shutter release is half-way pressed
C – Continuous – Auto focus is constantly recalculated as long as the shutter is
half-way pressed.
Focal Length
The size of your lens affects the perspective of what you are photographing. The
standard lens for a full frame DSLR camera is 40mm-50mm. When you have a 50mm
lens on your camera, your lens will create a photograph that appears the same as when
you view it with your own eyes: a 1:1 ratio. With a wide-angle lens, such as 24mm or
35mm, you can capture more of a scene because the wider the focal length of the lens, the
broader of a view it has. When you use a telephoto lens, such as a 180 or 300mm, you
photograph a zoom-in area of a scene and make it appear as if it is closer. Because
telephoto lenses have a larger focal length, the view is much smaller than a normal lens.
DX or APS-C Format
FX-“Full Frame” Format
18mm - 24mm
Wide Angle Lens
20mm-35mm
40mm
Standard” Lens
50mm
180mm
Telephoto Lens
300mm
18mm – 55mm
55mm – 200mm
Standard Zooms
Telephoto Zooms
28mm – 90mm
75mm – 300mm
DX Lenses vs. FX Lenses Crop Factor
Depth of Field
Depth of Field (DOF) – This term refers to the areas of the photograph both in front and
behind of the main focus point. Depth of field is affected by the aperture, subject
distance and focal length. If anything behind or in front of the main focus point appears
blurred, the photograph has a shallow depth of field (taken with a wide open aperture
such as f/2). If the subjects behind and in front of the main focus point are in focus, the
photograph has a greater depth of field (taken with a small aperture such as f / 22).
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