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Файл:Dental_Photography.pdf
Digital Photography
Film is replaced by electronic sensor
•CCD or CMOS
CCD
•CCD = array of tiny light-sensitive diodesodes (sensors)
•Thousands or millions of sensors on a CCDCCD
•CCD converts light into electrical chargesrges
•Signal is processed by analog-to-digitalal converter
Digital Photography
Dust!
•CCD is VERY delicate and VERYY expensive to replace!
•Keep dust out when changing lensess onon digital SLR
Digital Photography
CCD size vs. film size:
•CCD is typically smaller than 35 mmmm negative
•Magnification factor of 1.5 mm
(e.g. 100 mm lens effectively becomes 150150 mm)mm)