It was said by Rollei and some Rollei books authors that Carl Zeiss Mutar lenses for the TLR have the best correction working in conjunction with the Planar 3.5/75 six elements because it was the best seller Rollei camera when the lenses were produced; at least it seems to be true for the following tests, made with the same Mutar 0.7x and same photographer: http://www.grafikogfoto.dk/photographical/rollei_mutar07.html http://www.grafikogfoto.dk/photographical/rollei_mutar07_2.html Carlos --- 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