LENSB Y : D A N AY A J E F F E R S O N & ANTWANISHA GREEN
<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 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 .
<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 .
<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 .
<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 .
<3 SPECIAL-PURPOSE LENSES• Macro lenses1. A macro lens is useful extremely up close shots .2. This lens lets you focus at a very close range .• Fisheye lenses1. 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 .
<3 FOCUSING• Manual focus1. When you use manual focus, you select the part of the scene you want to be sharpest .• Follow focus1. This is an technique that lets you keep a subject that is moving toward you well focused .• Automatic focus1. 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 .