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#10
09-23-2014, 05:01 PM
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Yes, if you expand only the height, then the aspect ratio will be off. I believe that one of the switchable B/W porthole sets (perhaps the Stromberg-Carlson with the "opera glass" switch) expanded both width and height, to preserve the correct geometry in the portion of the image seen in the round tube. Of course, then you lose more of the rectangular image, but that's life with a porthole!
Phil Nelson 
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