I have a feeling this is going to be a long-shot but does anyone here have any experience in using one of these beasts?

I have found some explanations on their use but am totally confounded regarding the last part of reading [U]which[U] appropriate scale? It is not helped by the fact that the scales are printed in a font so small that a magnifying glass is almost required.

The instructions I have found state, "Use the appropriate scale in relation to the f number scale taking care to select the exposure time scale of the same colour as the index mark." That mean for bright areas use blue index mark, normal use white and dark use red.

I will admit that at my age I can be easily confused but this one has me beat.

Any assistance will be greatly appreciated.