Steve


I see John's post but I am not sure that is the effect you were asking about. With fast primes like the 85L and even the 35L 1.4 at narrow DOF you can really nail somthing in focus and blur forground and background to give you that effect. The constrast out of these lenses is great and it really improves that effect. As well if you have a camera that is really good at contrast like the 5D Mark II. You can create that illusion of seperation of the in focus area compared to the out of focus.


To highten that effect other factors come in to play, such as the nature of the forground and background. Seperation is good to, where there is a little bit of distance between the subject and background. That way the Out of Focus area doesn't trail off it is defined. Looking at your kit list, the 24mm F1.4L you have is the best in your kit for trying this, however 24mm is a bit wide but I think your best canidate. The right lighting comes in to play as well


I see where you asked Johnathan Huyer about this pic http://community.the-digital-picture.com/image_presentation1/f/15/p/5331/46560.aspx#46560, this is the effect I thought you might be asking about.


Maybe post a link to an image you are talking about so we could be sure what your talking about.