While the German bombsights of the 1930s were quite lacking, the follow-on versions of the Lotfernrohr 7 proved to be arguably as accurate as the American Norden bombsight.
In other cases, like the Arado Ar 234 or the prototype bomber conversions of the Messerschmitt Me 262, the tube was open to the air, mounted so the mirror window was almost flush with the fuselage line.
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In most installations, like those in the Junkers Ju 88 or Heinkel He 111, the tube ended in a fairing under the fuselage with a protruding flat window in front.
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The Carl Zeiss Lotfernrohr 7, or Lotfe 7, was the primary bombsight used in most Luftwaffe level bombers, similar to the United States' Norden bombsight, but much simpler to operate and maintain.
Once the Lotfernrohr 7D bombsight was introduced — with a similar degree of accuracy to the top secret American Norden bombsight — more accurate bombing from 3,000 metres (9,840 feet) could take place with an error range of just 91 metres (300 feet).