shutter-shudder

An involuntary muscle-twitching dat a camera-shy person feels from either having to press da release-button to take a photo, or when he hears da click of da camera when a picture is being taken of him.

One simple way to mostly eliminate image-blurring from fairly-minor shutter-shudder is to use a fast exposure-speed (and a flashbulb, too, if it's fairly low-light conditions); you may need to use a suitably large lens and wide aperture-setting to accommodate said swift-click camera-snap.

shudder

The feeling of shivers down your spine.

"I.." Basil shuddered, not daring to make eye contact with Aubrey. His knees began to slightly tremble, just the sight of the other was making him want to cry and run off in fear.