Quote:
Originally Posted by jaapv
I have a strong suspicion this was modified to serve in an astronomical telescope. It would be interesting to know if the front ring unscrews to reveal the original LTM thread. The modfying and special orders Leitz did in the fifties were not all that polished. My father had a slideprojector modified by Leitz to project onto an enlarger board for reading and printing microfilm . It involved tubes, a mirror, a negative mask etc. It is long ago, but what I remember of the engineering was about the same level as this thing. So it might well have been done by Leitz. The black box modification certainly suggests that it is a one-off construction by Leitz. I'm fairly confident that this was not a standard accessory, not even small series.
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It is indeed Leica factory made. It was made in small numbers for the medical market. I myself have the same item. And recently it was also again sold on Ebay (item number 120241220490).