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IMAGE RECORDING
PHOTOGRAPHIC RECORDING
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The process of forming a permanent record of an
image
Methods of recording the image include
 Film
and
 Digital cameras
PHOTOGRAPHIC CAMERAS
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Main Characteristics and Fundamentals
 An
optical device for obtaining still photographs or
film
 It consists of a light proof box with a lens at one end
and a plate of light - sensitive medium at the other
 The lens of the photographic camera is a converging
type
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FOCAL RATIO AND F-NUMBER
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The effective diameter of a lens or mirror is its
aperture
The ratio of effective diameter to the focal length
is called the relative aperture,
The reciprocal of the relative aperture is called
focal ratio
The numerical value of the focal ratio is known as
f-number
DEPTH OF FIELD
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When a lens focuses on a subject at a distance, all
subjects at that distance are sharply focused
Subjects that are not at the same distance are out
of focus and theoretically are not sharp
Some subjects that are in front of and behind the
sharply focused subjects can still appear sharp
The zone of acceptable sharpness is referred to as
the depth of field
DEPTH OF FIELD
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Increasing the depth of field increases the sharpness
of an image
Smaller apertures increases the depth of field
It determines the overall sharpness of focus
principal plane of the focus.
The lens aperture controls the thickness of the
principal place of focus
DEPTH OF FIELD
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National Centre for NDT
Recording
Image
THANK YOU