Metz mecablitz 64 AF-1 digital Operating Instructions Manual page 189

The shots are too dark.
• The subject is beyond the range of the flash unit.
Note: Using bounce flash reduces the range of the flash unit.
• The subject contains very bright or highly reflective areas. The
metering system of the camera or flash unit is deceived as a
result. Set a positive manual flash exposure correction, e.g., +1
EV.
The shots are too bright.
• In close-up shots, overexposure (shots that are too bright) may
result if the shutter speed is faster than the flash sync speed.
The aperture (f-stop) cannot be adjusted on the flash unit.
• There is an exchange of digital data between the flash unit and
camera.
Adjustment of the aperture is not possible!
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