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Message: <blockquote data-quote="WayneF" data-source="post: 229409" data-attributes="member: 12496">Yes, one stop is a 2x change.  And ISO and shutter speed are linear (a 2x change makes a 2x difference, which is one stop).Oops!   You are right, and I see it now, it was misworded.  Thanks much for pointing that out.It should say Doubling Guide Number doubles ...   I assumed it did say what I imagined it said, which was the point of the little chart there with it, but it didn't, and you made me understand that it was worded wrong.   I hate it when than happens.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> Thanks very much, I really appreciate the correction.  It is corrected now.</blockquote>