i can't view ur link...
in any case... the sample pic u got there,
i think u over PSed it... or is the background already like that when u took the pic?
colours a bit dull, maybe u could try taking e pic in brighter conditions. =)
this picture: not enough DOF, I would prefer the whole logo to be sharp
point 2: messy background, but good use of bokeh, what is the black triangle thingy?
headlight? it is distracting and does nothing for the picture.
this is non PS it was on a bright sunny afternoon so i had to play around with the ISO...background is meant to be blurred but the logo not....the black triangle thing is the car's pop up headlight...neat eh?
i set it at the highest f so the background would be blur....using a 300D with 18mm lens
Ok. For starters, the lens is always opened to it's widest Aperture in its natural state. So if you set an aperture of f3.5 (assuming that's the widest) and focus on something, you'll hear something moving but what you see in the viewfinder will not change when you press the DOF preview button.
When you set anything smaller than f3.5 (say f8 for example),focus on your subject and press the DOF preview button, the viewfinder will get darker PLUS, you'll notice that the background behind your subject will get clearer. Try it out. It may take a while to notice this.
Try the same technique with different distances between you and the subject, or with the subject and the background.