Hop, they said ...

... and I did

(p.s.  I attended a Day Long Photography Course yesterday which was given free of charge by Tallaght Library.    The tutor was one Podge Kelly and he was great.   He went through all camera settings, composition, a little photoshop and lighting for portraiture.  It was one of the most enjoyable days I have spent in a long time.  I met an interesting group of people doing the course and we all gelled immediately.  It was facilitated by South Dublin Libraries and it was a community-based project.   So it was all good.

So its possible, (just possible, mind) that I have solved 'The Mystery of the Elusive F-Stop'