Canon Model 7S - Manual (Page 34)

or forehead
2. When using in a horizontal position, both el­
bows should be pressed against your body.
In a vertical position, at least one elbow
should be pressed against your body.
3. Hold your breath and press the shutter button
with a smooth, steady stroke. If not done in
this manner, you will have a blurred picture.
• For exposures longer than 1 30 sec., you
should use a tripod and cable release to
prevent movement