Ah, I understand now Andrew.
And the second pic with the nifty fifty is more or less the same narrow depth of field shown in the book. It would have saved a whole lot of misunderstanding if they had said the stock lenses weren't capable of producing that image. I suppose if I'd understood a bit more, I wouldn't have been so easily misled.
Anyway, I understand now, thanks so much to you and all who have replied, for your invaluable help.
All the best guys
