Archived posting to the Leica Users Group, 2006/05/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]My interest has been, not that boke, or the character of the OOF areas can be measured, but that the characteristic of the lens design which has the effect could be measured. Many just mention a circular aperture but since it is the character wide open which is of most interest to me clearly the shape of the aperture has no influence. Canon state in their Lens Work publication, without explanation or discussion, that if the saggital and radial MTF curves run together the boke will be pleasing. This completely agrees with my experience in the case of the lenses I have been able to find MTF curves for so I am prepared to believe it, but I'd like to know why. I was BTW one of those who sold my CV 50mm f1.5 Nokton because of the boke being awful. My favourite 50 is my pre asph Summilux, though I have never seen never mind used the new one..... This is relatively simple. The differences between tangential and saggital MTF curves indicate how well off-axis aberrations are corrected, including astigmatism and field curvature; properties that affect bokeh. Bad bokeh is typically associated with these off-axis aberrations, which is why a significant difference in tangential and saggital MTF is indicative of the quality of bokeh. Marty -- ___________________________________________________ Play 100s of games for FREE! http://games.mail.com/