Adding Vertical Tilt Positions to the Canon Speedlite 550EX Flash Unit

Short Description
The Canon Speedlite 550EX flash unit provides vertical head tilt for bounce flash operation. Detented positions are only provided for angles of -7°, 0°, 60°, 75°, and 90°. Other tilt angles are useful for various work. This article describes the modification of the 550EX to add further positions to the detent.

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Content
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The Canon Speedlite 550EX flash unit provides vertical head tilt for bounce flash operation.1 Detented positions are only provided for tilts of -7°, 0°, 60°, 75°, and 90°. Other tilt angles are useful for various tasks. Although it is perfectly practical to set the head to angles not supported by the standard detent, this leads to uncertainty in the position, and leaves the risk that the head position can change during use.
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Disassembly
1. Remove the batteries from the unit.
2. Remove the rubber ring surrounding the elevation lock button on the right side of the unit and the solid rubber disk opposite it on the left side. The disks are held in place by adhesive. Pry them off with the tip of a pocket knife or equivalent. Do not use a sharp knife (such as a craft knife) as there is a risk of cutting through the disks. Place the disks where the adhesive will not be contaminated. It should be possible to reattach the disks using the existing adhesive.
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