Nick Venechuk
16-Oct-2009, 14:13
I have a lens which has few markings. No manufacture name or any of the usual information. The only marks are hand written numbers inside the barrell of each lens element, and a serial number on the rear lens assembly.
The shutter has settings from F 8 to F 64, and by comparing the infinity focusing distance with known lens (150mm, 120mm, and a 90mm) I've determined that this lens is a 165mm, or 6 1/2".
The lens construction (thanks to some great information on this site!) seems to be a Dagor, with three elements each at front and rear, and there is a double reflection within each lens, one bright and one dim.
The serial number style is the same as a Goerz, and if so, would have been made by the American company with a manfacture date of about 1935 to 1938.
But a lot of all this is simply guess work. All I'm sure of is the focal length.
So, does anyone have any knowledge of something like this? Why are there no markings on the lens rim? Could this have been made for the military? Or could this be a low-grade lens made for some type of fold-out camera?
Inquiring minds, and all that.
Nick
The shutter has settings from F 8 to F 64, and by comparing the infinity focusing distance with known lens (150mm, 120mm, and a 90mm) I've determined that this lens is a 165mm, or 6 1/2".
The lens construction (thanks to some great information on this site!) seems to be a Dagor, with three elements each at front and rear, and there is a double reflection within each lens, one bright and one dim.
The serial number style is the same as a Goerz, and if so, would have been made by the American company with a manfacture date of about 1935 to 1938.
But a lot of all this is simply guess work. All I'm sure of is the focal length.
So, does anyone have any knowledge of something like this? Why are there no markings on the lens rim? Could this have been made for the military? Or could this be a low-grade lens made for some type of fold-out camera?
Inquiring minds, and all that.
Nick