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Plastic-barrel black projector lens marked Isco-Göttingen. Single coated.
A serviceable taking lens, this: chromatic aberration is minor; across the frame sharpness is good for a projector lens (though inevitably not comparable to a modern kit zoom); single coated optics are protected by a deep integral hood, giving moderate resistance to flare; and bokeh is lively but well integrated, with more than a hint of bubble and swirl. Beware condition, though: the elements in this plastic-barrel Isco lens are ‘sealed in’ to human (but not fungal) intruders.