The edge line tends to be a parobola near the corners as I try to show in this new pic.
Probably the black paint can accentuate which seems to my eyes but it happens always I see an L/54.
The edge line tends to be a parobola near the corners as I try to show in this new pic.
Probably the black paint can accentuate which seems to my eyes but it happens always I see an L/54.
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