Canon SCOOPIC 16M Instructions Manual page 22

Focusing
Turn the focus ring to obta in the sharpest image. The
greater the focal length the more easi Iy and accurately
the aligned image can be seen. Zooming does not move
the image out of focus . First focus at the maximum
focal length of 75mm (3"), then return the lens to the
desired magnification.
When the shutter button is depressed, the
exposure for the subject being photographed will be
indicated by the needle in the T /sto p scale and the lens
will "stop-down" to the correct T /sto p. To temporarily
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override this system and bring the aperture to a full
open position for fast focusing, depress the aperture
opening button and hold during focus ing. Relea si ng the
aperture opening button allows the diaphragm to return
to the correct shooting aperture.
Adoption of the al l-matted focusing screen allows focus-
i ng at any point in the v iewfinder.