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OT- Nife 40 Cm

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/12/2012 at 10:59
magneticanomaly View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: March/12/2012
Status: Offline
Points: 3
I bought a supposed Swedish military optical rangefinder made by NIFE, model 40 cm or A-40



It appears in good condition, images are crisp and the focus and range adjustment controls move and work, BUT, the small image which needs to align with the larger one is UPSIDE-DOWN.

I do not know if I am simply doing something stupid, or if a reversing prism or mirror has fallen out of the optical path...I do not see how this could be and still have clear and approximately coincident images.... Allowing for the uncertainty of trying to line a right-side-up image with one upside-down, the actual ranges shown on the dial seem plausible.

I'm looking for a little guidance as to what to look for, before I begin to take the thing apart

Thanks!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/29/2012 at 22:10
magneticanomaly View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: March/12/2012
Status: Offline
Points: 3
A very kind and knowledgeable gent on another forum explained to me today how it works.

The lower edge of the upside-down inset image splits the object you wish to range. Above this edge it is upside-down, below it is rightside-up. The adjustment moves the inset image laterally until the features line up across the horizontal split line.

Thanks to Mr. Boyd over there, and to you all here who read and thought about it.
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