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Stephen,
Thanks for your considered reply. Your comment about educational standards is certainly true to my way of thinking. If you were subjected to a bad NHS experience, I feel for you. On the health and education fronts (and several others), many politicians over many years could and should be held to serious account, but they never will be.
As to the technical and mathematical reasoning behind my original query, you are, by and large quite right in that few photographers/picture takers care as long as they get what they want from their equipment. Frankly I've no desire to get down to the scientific reasons. The mere fact that what I had assumed to be was not, took me most by surprise.
Leaves one thinking though that, although generally "the proof of the pudding is in the eating" - how are we to know that the ingredients on the side of the box are really in it?
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