Quote: Originally posted by tim60
You observe correctly - short lens wide DoF, long lens short DoF. The bokeh character depends on the lens design, and the details of the iris are particualrly important.
Originally posted by Anvh All wrong unfortunately.
Sorry i'm lazy so going to link you through.
Bokeh Bokeh actually does depend greatly on lens design and aperture. If the aperture is curved or straight, whether is has five blades or nine, it will differ. The lens will also affect the quality of the bokeh, wehther the OOF circle is consistent, has a bright edge, or even donut shaped.
DOF on the other hand defies logic to some extent when you start to realize, as mentioned, that for the same object when viewed at the same size DOF does not change regardless of focal length. Probably for that reason, since longer focal lengths appear to compress long distances into a smaller portion of view, DOF will appear to change more radically.
Probably the best way to see how DOF is affected is to go to DOFMaster.com and play around with their calculator.