Roger Cole
Member
Could it also be that it is more difficult to cut a perfect circle or make a circular stretched canvas?
But some make circular photos as a practice, Susan Patrice comes to mind: http://aeqai.com/main/2019/03/fotofolio-susan-patrice/
There was an article in the old View Camera magazine when I subscribed to it back in the 90s about round format images. I remember really liking the ones from the person whose work was highlighted. Not something to shoot as a rule but I've sometimes thought of trying to make a project out of shooting round images (or at least printing round images.)