HP Photosmart R837 Quick Start Manual page 18

3. Press the Shutter button halfway down to measure
focus and exposure. The focus brackets in the
Image Display turn solid green when focus is locked.
4. Press the Shutter button all the way down and
release to begin recording video.
5. To stop recording video, press and release the
Shutter button again.
After you have recorded a video clip, the camera
displays it briefly in the Image Display.
16 HP Photosmart R837 Digital Camera