I have enjoyed taking photographs that were square since I first shot with an old Zeiss  6x6 folding camera. When I first saw images that vignetted completly intro a full circle and where not a fish-eye - I felt compelled to try this. These images were taken on 8x10 film and using a Schneider 135mm symmar (plus solid lens shade) creating an ~ 7inch circular image that I subsequently contact printed.