1. LENS
B Y : D A N AY A J E F F E R S O N
& ANTWANISHA GREEN

2. <3 LENS FOCAL LENGTH
• Lenses are described in terms of its focal
length .
• Focal length controls magnification .
• Focal length also controls angle of view .

3. <3 NORMAL-FOCAL-LENGTH
• A lens of normal focal length approximates the
impression human vision gives .
• A lens of normal focal length has certain advantages
over lenses of longer or shorter focal length . They
are normally faster, open to to a wider maximum
aperture, so shutter speed can be faster or don’t
open as wide in dimmer light . They are often less
expensive, more compact, and lighter in weight .

4. <3 LONG-FOCAL-LENGTH
• A lens of long focal length provides greater image
magnification and a narrow angle of view .
• Long lenses are excellent when you can or do not want to
get close to the object .
• Long lenses have less depth of field so objects in the
background can be out of focus .
• Long lenses have some disadvantages . They are usually
heavier, bulkier, and more expensive . They have relatively
shallow depth of field so they must be focused accurately .

5. <3 SHORT-FOCAL-LENGTH
• A short lens is more commonly called a wide angle lens .
• A lens of short focal length increases the angle of view and
shows more of the scene .
• Short lenses are very useful when you are prevented from
moving back as much as necessary .
• Short lenses have considerable depth of field .
• A short lens can distort perspective . Objects close to the lens can
appear larger than an object of the same size that is farther away
.

6. <3 ZOOM LENSES
• Zoom lenses are popular because they combine a
range of focal lengths into one lens .
• A zoom has disadvantages . They are often more
expensive, bulkier, and heavier .
• Zoom lenses are best used when where light is ample
because they have small maximum aperture .

7. <3 SPECIAL-PURPOSE LENSES
• Macro lenses
1. A macro lens is useful extremely up close shots .
2. This lens lets you focus at a very close range .
• Fisheye lenses
1. A fisheye lens have the widest of wide-angle views .
2. This lens exaggerates degree differences in size between
objects that are near to the camera and those who are farther
away .

8. <3 FOCUSING
• Manual focus
1. When you use manual focus, you select the part of the scene you want to be sharpest .
• Follow focus
1. This is an technique that lets you keep a subject that is moving toward you well focused
.
• Automatic focus
1. This does the focusing for you .
2. If your subject is not in the center, you can use auto focus lock to make it sharp .
• Shutter speed and aperture play an important role in making
objects appear sharp in the final picture .