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 lens hs the unique three electric connectors for the which allows the Praktica LLC or the similar Praktica PLC cameras to read out aperture setting from the lens.

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