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Well, I will contact the WAC authors, I´m curious about the reason for that square peri...
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The reason for is that they are using Church's scope mod. When that mod was created many years ago, the author did it by studying the external rectangular shape of the observation periscope lense, and concluded that the view had to be also rectangular then. However, the reason for the enlonged vertical lense is actually to allow the inner circular lense to tilt up and down and see in different angles.
I have posted here many times a picture of an authentic german WW2 observation periscope manual that shows in a diagram the reticle and what you see when looking through the periscope.