CT
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OK - prompted by Steve's 'Did You Know' thread, who knows the origin of the f number as in f2.8 etc, and why are changes of aperture sometimes referred to as 'stops' ?
There's no definitive answer to either question by the way, the origins are lost in time, but there's a generally accepted origin for each.
There's no definitive answer to either question by the way, the origins are lost in time, but there's a generally accepted origin for each.