Especially in the case of small objects, the working distance may be smaller than the selected lenses minimal working distance (MOD). In this case, we decrease the minimal working distance by putting extension rings between the lens and the camera. We will see details at Step 4 (Setup). The following example depicts the selection of an extension ring:
Inspection of a birthmark:
In this case the focal length is 14.7 mm and thus we select the H1214-M(KP). Its minimal object distance (MOD) is 0.25 m and thus exceeds considerably the required working distance of 3 cm. The table below indicates the use of a 5 mm extension ring.
Post published by TIS Marketing on June 16, 2008.
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