synthesim wrote:I see, and thank you. But supposing the radar was out, might they have put the 15M units to good use for scanning the horizon then?
..... Others may be able to supply more precise data and insight, but it is my feeling that the turret optical range-finders would have been difficult to use effectively for visual surveillance. Their magnification was probably about 20x, which would have been no better than those big Japanese pedestal-mounted watch binoculars and they would have been very cumbersome in terms of scanning. they only had a few degrees +/- movement independent of the turret, meaning that the entire turret would have to be rotated a few degrees avery minute or so in order to sweep the horizon effectively.