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Thanks for the replies, Any comments on getting a bright enough highlight on the ball bearing indoors with artificial light? Is a 60W globe from a bedside lamp okay? Should it be close or far away from the ball bearing?
And is a really small ball bearing better for making the highlight unresolvable? Currently have a choice of a 3mm or 8mm.
Also, anyone know how to mathematically figure out minimum focus? I'd need to know this even to know how long the extension tube should be, surely?
Markus
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