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In this sample image the sensor used was a 1/3" Aptina MT9V024. The coin was at the closest distance of approx. 42mm.
In this next image the penny (d=20.3mm) was at a distance of 8cm from the lens.
This lens has a large focal length and a small field of view. This produces an image with low minimal distortion.
In the next images the sensor used was a 1/4" Sony ICX618. The first image is focused at a distance of 38mm from the lens and the second at 53mm. This lens has a very small f number of f1.4 creating a narrow depth of field.