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Message: <blockquote data-quote="PeterPS" data-source="post: 3316169" data-attributes="member: 124043">Henry,I am familiar with the discussion in the thread that you mentioned. I guess the points that I was trying to make were these:-the SF distortion is more complex than SV's and I am not sure that the effect induced by it should be called RB like for the SV,  as a part of the SF's FoV should not roll (due to pincushion)----but I might be mistaken; I mean it does not look like a rolling globe, does it?-I thought that the complex pincushion+barrel distortion of the SF might reduce the "RB" effect, compared with SV, but people who are affected by RB appear to suggest the opposite---maybe it is the barrel distortion that amplifies the effect, but then how about the pincushion distortion that should attenuate/eliminate it for a large part of the FoV?Peter.</blockquote>