Nikon FA Instruction Manual

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Nikon FA Instruction Manual Manual pdf 47 page image

48TECHNICAL INFORMATION/PHOTOGRAPHY TECHNIQUES continuedDEPTH OF FIELDWhen you shoot at a certain aperture and focusing distance,you will find that not only the main subject but also objectswithin a certain range in front of and behind it will be sharp in thefinal photograph This in focus zone'' is known as depth of fieldObjects beyond this range become increasingly out of focus.When the zone of sharpness is large, depth of field is deep:when it is small. depth of field is shallow.The following is true ofdepth of field:1) The smaller the shooting aperture (i.e., the larger thenumerical f-number), the deeper the depth of field; the largerthe aperture, the she lower the depth of field.2) The farther away the subject is from the lens, the deeper thedepth of field becomes; the closer to the lens, the shallowerthe depth of field.3) The longer the focal length of a lens, the shallower the depthof field at each f/stop, the shorter the focal length, thedeeper the depth of field.4) There is greater depth of field behind the main subject than infront of it.The depth of field at each aperture is indicated on the lens by aset of color-coded lines (corresponding to the colors of the f-numbers on the aperture ring ) which are used in conjunctionwith the distance scale on the focusing ring ). The rangeis indicated by the distance between the lines.When a lens with an automatic diaphragm is used, the image inthe viewfinder is viewed with the lens at maximum aperture.However, when the depth-of-field preview lever's is pusheddown, the lens will be stopped down to the aperture set,enabling you to examine depth of field before shooting Theimage in the viewfinder darkens according to the selectedf-number, the smaller the aperture, the darker the image.Portions of the picture that appear in focus when the lever ispushed down-will be in the zone of sharp focus.Note that the lever should be depressed all the way.This lever is also used for stop-down exposure measurement(refer to page 54.)• Certain Zoom-, Reflex-, and PC-Nikkor lenses do not have adepth-of-field scale• Pushing the lever automatically changes the metering methodfrom automatic multi-pattern to centerweighted• Depth-of-field can be previewed only in the A and M modes626563 45