What is the best way to set the WB manually?
The manual suggests aiming the camera at a white surface when setting the WB manually. However, since the WB setting only affects the red/blue tint, you can use any warmth-neutral colour, such as various shades of grey. The 18% grey cards used for exposure settings work well. A more convenient alternative that gives surprisingly good results is holding a translucent Pringles lid against the lens like a filter and pointing the camera at the scene (or the light source) while setting the WB. It is also possible to create a White Balance cap with it. Other suggestions include Coffee filters (single or stacked), a Styrofoam coffee cup, etc. or the more professional but expensive ExpoDisc.
