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In this sample image the sensor use was a 1/3" Aptina MT9V024. The coin is at a distance of approx. 27mm.
In this sample image the penny (d=20.3mm) was at a distance of 20cm from the lens.
This lens has short focal length which enables a large field of view. This does create some distortion towards the edge of the image but the penny remains sharp.
In these sample images the sensor used was a 1/4" Sony ICX618. The first image is focused at a distance of 14mm from the lens and the second at 27mm. This lens has a small f number of f2.0 creating a narrow depth of field.