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In the image below the sugar cube was 465mm from the lens. This is the minimum distance that this lens will focus with this camera.
The sugar cube measures 16mm x 14mm.
In this sample image the penny (d=20.3mm) was at a distance of 45cm from the lens. The sensor used was a 1/3" Aptina MT9V024.
This lens has very large focal length and minimal distortion.
In these sample images the sensor used was a 1/4" Sony ICX618. The first image is focused at a distance of 218mm from the lens and the second at 234mm. This lens has a small f number of f2.5 creating a narrow depth of field.
The following image is an image of sugar granules, taken with a 6mp sensor at an operating distance of 170mm.