Carl Dietzler Brass Petzval Lens 900mm 90cm Focal Length

approx. 90cm focal length, for use with waterhouse stops, in fully original and unrestored condition, nothing is polished, small scratch in inside rear element, some small cleaning mark scratches, original mounting ring (diameter c.17.5cm), total height without hood c. 30cm, front lens diameter c.10.5cm - a fantastic Austrian brass Petzval type lens in superb condition, very rare and hard to find