Canon 577 G - Manual (Page 26)

WIDE ADAPTER 577G-24
Normally, light from the 577G is
spread wide enough to cover the
angle of view of a 35mm or longer
lens. If it were used with a wider
angle lens, the edges of the picture
would be too dark. With the Wide
Adapter 577G-24, the flash unit’s
light is diffused enough to cover the
angle of view of 24mm and 28mm
lenses also. (It may also be used with
lenses longer than 28mm). At the
same time, the unit’s power is re­
duced and the farthest distances at
which you can shoot are closer than
they usually are.
To attach the wide adapter, simply
slide it in the grooves of the flash
head so that the colored distance
scales on its one side are facing the
back of the flash. These distance
scales, which show the reduced
shooting ranges, replace the ones
below the calculator dial. They are
color-coded to match the three po­
sitions of the aperture selection dial.
In all other respects, the flash may be
used as usual.
*
With Wide Adapter 577G-24
attached, the 577G’s guide
number becomes 28 at ASA100.
*
If you use the flash with Wide Ada­
pter 577G-24 and a 24mm lens to
copy a flat subject, the picture
will be dark around the edges.
This combination is mainly for
taking pictures of three-dimen­
sional subjects.
* For using the flash with a lens
having a focal length down to
20mm, Wide Adapter 577G-20 is
available as an optional accessory.
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