> www.questarcorporation.com/QuestarPDF/QM_100_30003.pdf
>
> Operating range of f/no: 6.0 to 3.5 (less than 14 or 22)

Those figures are the maximum possible aperture (= minimum aperture
number) at varous distances. Smaller apertures can usually be used in
practice at any given distance - just not larger ones.


 Russell
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