By Henry Horenstein
The booklet was once simply as defined and arrived per week prior to it was once scheduled to!!! may recommend!
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Additional info for Black and White Photography, Third Revised Edition
Sample text
So in theory you can use a 35–80mm lens at 38mm, 46mm, or 76mm, lengths that are not available at all in fixed-focal-length lenses. You may not know the exact focal length you’ve set, because the scale on your zoom lens, if there is one at all, can’t be set that precisely. 32-55 3/11/05 11:53 AM Page 47 The Camera Lens 4 47 Teleconverter A teleconverter fits between the camera body and lens to increase the effective focal length of the lens. Maximum lens aperture: page 52 A teleconverter is a tubelike accessory that fits between the camera body and the lens to increase that lens’s effective focal length.
Even though you focus precisely on the tree, an area in front of and an area in back of the tree also will usually be sharp. The degree of that sharpness, from front to back, is the depth of field. The depth of field of a picture may vary widely and is controlled by these factors: lens aperture, distance to subject, and lens focal length. Lens aperture. The smaller the lens aperture you use, the greater the depth of field. Thus if you set your lens at f/16, you will produce an image with far greater depth of field than if you set the lens at f/2, other factors being equal.
Film of a given speed (sensitivity to light) needs a certain amount of light, not too much and not too little, to record an image. 32-55 36 3/11/05 4 Autofocus Problems 11:53 AM Page 36 The Camera Lens Autofocus can be a powerful aid when it works, but frustrating when it doesn’t. And there are some situations in which it simply falters. Certain techniques can help you work around these situations, but occasionally you will find it easier to switch from autofocus to manual focus. When the subject is off-center, many autofocus systems focus on the foreground or background instead of on the main subject.