Calhoun Rapid Perspective 14X17 22" (580mm) F8 ULF lens
"Antique" brass lens, probably circa 1910. B&L Rapid Rectilinear style lens, made for an in house brand.
22" focal length.
Built in diaphragm works nicely, with F stops marked from F8-64.
Massive coverage, more than 16X20.
Overall, in good shape with nice patina.
Generally clean glass.
Includes original flange.