Photo Terms Focus is not an absolute There is always a zone either side of the focused point that is acceptably sharp The size of this zone will depend on how far away the subject is the focal length and aperture of the lens the size of the final picture and what you regard as acceptable ID: 563017
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Slide1
Understanding Depth of Field and Lenses
Photo TermsSlide2
Focus is not an absolute. There is always a zone either side of the focused point that is acceptably sharp. The size of this zone will depend on how far away the subject is; the focal length and aperture of the lens; the size of the final picture; and what you regard as 'acceptable'.
http://www.markushartel.com/blog/learn-from-markus/zone-focusing
Zone FocusingSlide3
In a 35mm system, a telephoto is any lens longer than 100 mm. Compared to a "normal" 50mm lens, a telephoto has a narrower angle of view. It thus gives apparent magnification to objects. It also seems to compress distant things, and there is less depth of field. A good telephoto lens is an essential part of any nature photographer's kit, and learning how to use one is an important skill. Because of their ability to magnify, these lenses are unforgiving of poor photographic habits.
Telephoto Lens
(Long-Focal Length)Slide4Slide5
http://www.bing.com/images/search?q=picture+taken+with+a+telephoto+lens&FORM=IGRE&qpvt=picture+taken+with+a+telephoto+lens#focal=e63ed04a655fcfd1eeb75999fa235e2c&furl=http%3A%2F%2Fphotonaturalist.net%2Fwp-content%2Fuploads%2F2010%2F08%2Fnormal50.jpgSlide6
a lens used for close-up photography that produces a life-size or larger image
Macro LensSlide7
Camera lens whose point of focus is a short distance from its optical center, so that it has a wide horizontal field of view. These lenses are available in different sizes and some can actually cover an area wider than the eye can see. Wide-angle lenses also provide a deep perspective, or
depth of field
, so that all the elements seen through the lens will appear in sharp focus.
Wide Angle Lens
(Short Focal)Slide8Slide9Slide10
http://www.ehow.com/facts_5396872_difference-point-shoot-digital-cameras.html
Single Lens Reflex