Cameras: Lenses MC351-01
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This 3 page Class Notes was uploaded by Alyssa Notetaker on Sunday August 30, 2015. The Class Notes belongs to MC351-01 at Southeast Missouri State University taught by Frederick Jones in Summer 2015. Since its upload, it has received 33 views. For similar materials see Basic Video and Film Production in Journalism and Mass Communications at Southeast Missouri State University.
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Date Created: 08/30/15
CAMERA 2 LENSES LENS A39ITRIBUTES Lightreated characteristics a Includes aperture and lens speed Sharpnessrelated characteristics a Includes depth of eld and focus Perspectiverelated characteristics a includes differences in focal length Understanding lens attributes will help you better communicate your story IRIS and APERTURE Iris a Mechanism that controls how much light passes through the lens Aperture a Lens opening created by the iris IRIS and APERTURE ris Ring aUsed to manually adjust the aperture blt is typically located toward the back of the lens AutoIris a Automatically adjusts the aperture b Doesn t work well in highcontrast situations FSTOPS The number that indicates the aperture Fstops are located on the iris ring Common fstops include af28 f4 f56 f8 f11 and f16 bThese numbers will stay consistent from lens to lens To quotclose downquot means to increase the fstop number or let less light into the lens To quotopen upquot means to decrease the fstop number or allow more light into the lens The optimum clarity for a lens is typically between f4 and f11 EXPOSURE Over exposure aToo much light passes through the lens bObjects will go to white and detail will be lost c Close down your aperture in this situation Underexposure a Not enough light passes through the lens b Objects will go to black c Open up your aperture in this situation o LENS SPEED The lowest fstop setting on the lens 0 A quotfast lensquot has a relatively low initial fstop a Good for low light situations bAnything under f17 is considered fast 0 A quotslow lensquot has a relatively high initial fstop a Should be used primarily in daylight situations bAnything over f28 is considered slow 0 DEPTH OF FIELD The area in which objects located at different distances from the camera will all be in focus Three variables impact depth of eld 1 Distance of subject from camera a DOF increases as focus point gets further away bAperture a DOF increases as fstop number increases c Focal length a DOF increases as focal length becomes smaller 0 FOCUS TECHNIQUES Rackfocus a Change focus in shot from one subject to another 0 Pull focus a Change focus to keep moving subject sharp b Necessary when depth of eld is shallow o Splitting the focus a Maximize depth of eld between multiple objects by placing focus onethird distance from rst object o SPLITTING THE FOCUS o FOCAL LENGTH The physical length of the lens a Speci cally the distance from the optical center of the lens to the camera s imaging device 0 Focal length greatly impacts a lmage perspective and texture b Depth of eld c Camera movement Three basic categories of focal length 0 NORMAL LENS Perspective is similar to human sight Texture of image is realistic Depth of eld is fairly good Camera movement is noticeable without tripod No real distortion Overall this is not the most visually interesting lens type WIDE ANGLE LENS Objects appear farther apart than they really are Texture is hard and gritty Excelent DOF good for deep focus Absorbs camera movement well good choice for handheld camera Close objects appear stretched TELEPHOTO LENS Compresses distance objects seem closer than they really are Texture is soft and more abstract Very narrow depth of eld Exaggerates camera movement Objects appear at movement towards camera is slow ZOOM LENS Variable focal length lens a Can change from wide angle to telephoto b Numbers on lens barrel indicate focal length Focal range a Distance from widest to tightest setting b Expressed as focal length ex 25mm100mm or ratio 10x LENS CARE Use lens cap when camera is not in use Do not touch the lens surface Do not wipe off lens with nonrecommended material Do not blow on the lens LENS CARE Use recommended lens paper and lens uid to clean lens Wipe lens with circular motion Canned air and camel hair brushes are also effective for lens cleaning
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