OK Mick slight diversion from current task but I have done a quick test using the pop up flash on D100.
Composite pic attached. As you can see the straight tube does not work. A full length toilet roll becomes a snoot. The slighly conical flower pot gives some improvement, then lastly using fresnel lenses.
I now recall that the credit card sized magnifier I have seen is marketed by JML. Budget end of dept stores etc.
Hope this is useful.
Don
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