See APO Lanthar 90mm's > http://www.pbase.com/image/143411845 See Elmarit-R 90mm's > http://www.pbase.com/image/143412462 See Tele-Xenar 90mm's > http://www.pbase.com/image/126951691 See Tamron 90mm's > http://www.pbase.com/image/143450634 See G-Sonnar 90mm's > http://www.pbase.com/image/142057516 It is better than I expected even thou at F4, since it looks unsharp for the normal situations (and closer subjects) at F4 with TX-1 and films.