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Brass lens with aperture control and flange.
This collectable antique Busch’s Portrait Aplanat No3 has a focal length of 11 inches and a maximum aperture f6. It was made around 1904 for large format wooden cameras.
Dallmeyer 6 inch f4.5 Serrac uncoated black painted brass lens without an iris diaphragm. Flange mount thread approx 46mm.