Gabriel Klavun's demo reel as a cinematographer can be seen at various quality levels depending on your connection speed. These are Quicktime .mov files.

Super-fast speed (1Mbps)
Pretty fast speed (512 Kbps)
Slow dial-up (56 Kbps)

If none of these work, you can't view Quicktime files, this is a link to a version hosted on YouTube at a lower resolution:

Alternative viewing option