These two magnifiers are designed to help the photographer focus on the ground glass screen of his field camera or studio camera.
Can also be used for looking at negatives / positives on a light box.
Each one can be adjusted to the user's vision, one by simple sliding tubes, the other by a helical screw.
They are both in very good condition, though the helical screw thread has a little damage.
This does not prevent it from working.
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1890 to 1900