Hello everybody! First of all I'm sorry if my English is not perfect. I have a question. Here - the Petzval formula: http://www.apug.org/forums/attachment.php?attachmentid=2407&d=1122119230 Here - the formula of the lens I'm interested in, it is Steihel's Portrait Antiplanat ( Antiplanet?) http://www.apug.org/forums/attachment.php?attachmentid=2408&d=1122119230 Does someone have experience with this lens? I need a lens, with will give the exact Petzval type image - very sharp in the center with soft corners and nice bokeh. I don't need one of the "soft" portrait lenses, which don't give sharp picture at all (like Imagon, Verito etc.). I'm also interested in a short and relatively small Petzval - I'm going to mount it on my Pentax-67 via helicoid macro tube ( as I successfully did with 150mm Heliar). The Antiplanat has small rear element and it is nice because it will be easier to mount on the helicoid. But will it give me the exact Petcval-type character of the image?!