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After years of research I'm still looking for detailed info how they find range to target with attack scope. What kind of scales there were in the scope? Just marks like we can see them in the SHIII attack scope? I doubt this. I think what you saw when looking in the real attack scope was much more complicated.
Heinz Schaeffer tells in his book "U-977" how you could see different "marks" when looking through the scope. Color of "marks" were red, green, yellow, black or white depending on what was their purpose. So, what are those marks? Any ideas? Marks for different mast heights?
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That was the fixed attack scope or Standsehror. It had an integrated analogic "computer" or range and AOB finding system through wiz-wheels. The results were displayed in the ocular, out of the main field of view. AFAIK green and red were for the different AOB (Port/Starbord), yellow for the range, black for the bearing to target.
Could you post the whole text of Schäffers book when he talks about the scopes? I would be interested in reading it, may be I can find something new