Archived posting to the Leica Users Group, 2012/09/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Dare I risk the wrath of Dr Ted and comment? Firstly not everyone uses the same interpretation of bokeh. Some only consider what out of focus point highlights look like (including whether the discs of light from those are round, their edge characteristics, homogeneous, haloed, aperture opening shaped etc. It more generally refers to the appearance of all out of focus areas and it is sometimes subjectively judged based on the transitions from best focus to out of focus. However the bokeh of any one specific lens is not a fixed value at all. I can show quite different examples from the same lens for example There is an excellent technical article on Depth of Field and Bokeh by H.H. Nasse of Zeiss available from their camera lens blog (CLN35 is the one you want) >From that article these are factors outside of the focal plane that influence bokeh Picture format Focal length f-number the camera-to-subject distance Distance to the background or the foreground Shapes and patterns of the subject Aperture iris shape Aberrations of the lens Speed of the lens Foreground/background brightness Colour Now I wait trembling for the wrath of the Canadian avenger to descend upon my photo-geeking head for this post. Cheers, Geoff http://www.pbase.com/hoppyman