Pentacon 3.5/39-80 electric

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Pentacon Mini-zoom
image by TrueLoveOne (Image rights)
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Pentacon Mini-zoom
image by TrueLoveOne (Image rights)

This is Pentacon's "Mini-Zoom" 39-80mm f/3.5 macro zoom lens. It is a rebranded Sigma lens. It offers a short zoom range of 39 to 80 mm's, hence the name "mini-zoom". In addition to that, there is a switch on the lens barrel that allows the photographer to turn a ring which moves the rear lens group. It gives a maximum reproduction ratio of 1:3,5. The f/ stops on the lens are shown in green from f/8 upwards, aswell as the reproduction ratios on the macro ring, indicating that macro use is adviced to be used only from f/8 upwards, the lens will not produce a sharp image stopped down below f/8, this is actually true, I have tested it. The M42-lens has the unique three electric connectors which allow the Praktica LLC or the similar Praktica PLC cameras to read out aperture setting from the lens.

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