QUOTE(cexco @ Feb 15 2011, 04:06 PM)

"You don't need to hold the lens too far away, unless you want to get light leaks.
If you just want the tilt-shift effect, you can just detach the lens, but hold it in place against the camera, then slightly move the lens left, right, up or down. It's easier if your camera has a "live view" so you can see what it looks like, but it's not too much harder with the view finder.
You only need to move the lens a few millimetres (fractions of an inch), and doing it this way, there's really no risk of dust getting in to the sensor.
If you want lightleaks or the super-macro kind of effect, you will need to hold the lens a little bit further away. Probably no more than a finger width, though. The image will be less defined and less sharp the further away the lens is, though.
For light leaks, I've found it's best to be in a fairly dark room, with a big window in front of you. This lets the outside light get in to the camera (i.e. no through the lens, but just going straight in to the gap between the lens and the camera) but limits the ambient light getting in and making the photos less defined."
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