SIGMA SD1 - Manual (Page 60)

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3
Keep the shutter button depressed halfway while you compose the picture as
desired. Then press the shutter button the rest of the way to take picture.
z
Focus Lock with the shutter button can be used with (single AF mode) only.
The AF cannot be locked in (continuous AF mode).
z Focus Lock can be done by pressing the AF button. After focusing, keep the AF
button fully depressed. (For more detailed information, please refer to P.60
“AF Drive and AF Button Setting”.)
z AF Focus Lock with the AF button can be used in (continuous AF mode）as
well.
MANUAL FOCUS
In situations, where autofocus or focus lock is not effective, you can focus
manually.
1
Set the focus mode switch, on the lens to the
M position. (”MF” will be displayed in the
Function Display.)
2
While looking through the viewfinder, turn the
focusing ring on the lens until you get a clear
sharp image.
z
When you use a lens, which has maximum aperture value of F6.3 or faster, the
focus indicator in the viewfinder will appear, when correct focus is attained.