The tip of a ballpoint pen.
The ball is 0.8 mm in real life and 3.6mm on the sensor = 4.5X magnification.
Strobist: Olympus FL-50R@1/4 right of camera and slightly above, triggered by cable. Nissin 4000GW@1/4 left of camera, triggered by optical slave. The flashes were positioned just inches away from the pen, you need lots of light at this kind of magnification.
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This image, originally posted to Flickr, was reviewed on 20 November 2013 by the administrator or reviewerNiklem, who confirmed that it was available on Flickr under the stated license on that date.
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{{Information |Description=Spetsen på en kulspetspenna. The tip of a ballpoint pen. The ball is 0.8 mm in real life and 3.6mm on the sensor = 4.5X magnification. Strobist: Olympus FL-50R@1/4 right of camera and slightly above, triggered by cable. Ni...