I read somewhere that the additional element was a marketing ploy. Photographers believed that more elements = better quality and that there had been an issue with flare/haze on the 5 element Planar lens, so Rollei incorporated a UV filter in front the optical train and said the lens was now a 6 element. Any comments....? John --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list