I got this several years ago and have not been able to find out much about it except that the name Hansa was attributed to the first Canon cameras. It is some sort of rangefinder but I don't know what camera or what focal length lens it would go to... Any ideas?
As you say, it's obviously a range finder, for use with a camera, especially for close-up work. It has two receiving windows, set about the same distance apart as your eyes. The two images are displayed in the device as one double image, which you can see through the eyepiece. Turn the dial until the double image you see becomes a single unified image and read the distance.
It's probably 70 - 100 years old. Add it to your museum. You'll never need to actually use it.
It is a rangefinder, but it is not focal length dependent. It will mount to any camera that has a The old standard accessory shoe/mount. These are quite handy for use on vintage cameras that don’t have built-in rangefinders, like the old folding cameras or “miniature” cameras from the ‘30s through the ‘60s. One uses the rangefinder to find the distance to the subject and then adjusts the camera’s lens to that distance to take the shot.
Stan
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