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Message: <blockquote data-quote="Bass359" data-source="post: 3584110" data-attributes="member: 142293">After reading the above, I still do not understand why most manufactures are now including the field flatteners?  If edge to edge sharpness is not dependant on FF, then why add the complexity and cost?  Is it because edge to dge sharpness does not ensure depth of field sharpness due to closer focusing and due to wider FOVs in modern binos?  Therefore field flatteners are added?In other words, is petzval field distortion a great problem now and it is being corrected?  Or maybe the problem is not greater but the expectations are greater?</blockquote>