> What is your experience in the matter?

Flavio, my opinion on the very common discrepancies between
advertised and observed "f and F" specifications go something like
this:

1.  Apertures are frequently slightly less generous (i.e., slightly
narrower) than advertised.

2.  Wide-angle lenses are frequently not quite as wide as advertised.

3.  Telephoto lenses are frequently not quite as long as advertised.

4.  Zoom lenses frequently have focal length ranges less generous
(i.e., narrower) than advertised (and frequently the "fudging"
occurs at both ends of the zoom range).

Fred
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