[SKAustin]

With most digital cameras, there is a delay that occurs while the camera's autofocus adjusts. If you press the button half way, the autofocus will adjust, hold the button halfway and re-adjust your focus on the subject by increasing or decreasing your distance from the subject, then once youve achieved the desired focus, push the button the rest of the way.

 

[SKAustin]

Also be sure to keep the camera at an angle to the glass to avoid flash reflection.