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Sensor size

Stan Accrington
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How do you read the CCD sensor size?

When you see 1/1.8", that mixes decimals, fractions, and imperial units.
What are the equivalent words?
Is it "the reciprocal of one-point-eight"?
Or "one and one eighth" or what?

There is a good article on what it actually means at:

1/1.8" is approx 7 by 5 mm

2/3" is approx 9 by 7 mm

Those CCD sensors are tiny!
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