AGFA 307 Owner's Manual page 55

BUILT-IN Flash Precautions
FLASH RANGE
The range of the built-in flash depends on the aperture selected. Make
sure your subject is within the working range of the flash, specified in the
table below.
Aperture
F 6.7
1.0 - 5.0 m (3.3 - 16.5 ft.)
F 8
1.0 - 4.2 m (3.3 - 13.8 ft.)
F 9.5
1.0 - 3.5 m (3.3 - 11.5 ft.)
F 11
1.0 - 3.1 m (3.3 - 10.2 ft.)
1.0 - 2.1 m (3.3 - 6.9 ft.)
F 16
If you want to take flash photographs closer than 1m (3.3 ft.), we
recommend that you use Minolta's Close-Up Diffuser CD-1000. Otherwise
lens shadowing may occur in the bottom of your picture. This accessory
provides softer lighting for more pleasing close-up photographs.
CAUTION: LENS SHADOWING MAY OCCUR
Lens shadowing may occur at the bottom of your pictures when using the
built-in flash with certain Minolta AF lenses. To reduce the chance of lens
shadowing, never use a lens wider than 28mm, never use a lens hood, and
do not photograph closer than 1m (3.3 ft.). The following lenses may
cause shadowing at the wider focal lengths:
AF Zoom 28 - 70mm f/2.8
AF Zoom 28 - 85mm f/3.5-4.5
Built-in flash should not be used with the following lenses:
AF 300mm f/2.8 APO
Flash Range
AF Zoom 28 - 135mm f/4-4.5
AF Zoom 28 - 200mm xi
f/.5-5.6
AF 600mm f/4 APO