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Old Oct 17, 2005, 9:03 AM   #1
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As this issue popped up again in the Maxxum/Dynax 5D review, I thought I'd post KM's answer from the 7D FAQ:

Images are underexposed when using the Program Flash 5600HS(D) or 3600HS(D), compared to when built-in flash is used. Can you change this?|

Use of Program Flash 5600HS(D) or 3600HS(D) will not result in uniform underexposure. However, under- or overexposure may result from one or more of the following factors:

- Longer shooting distance.
- Smaller subject magnification.
- Subject in front of, or behind, the point of focus.
- Shorter focal length.
- Higher proportion of pre-flash reaching the background.
- When a subject is very close to or on the background wall.
- When the background wall is NOT facing towards the camera.
- Composition within the frame.
- Lighting conditions existing within the frame, e.g. illumination or
- Reflectance of the subject.

Due to the difference of inherent guide number/control method of each
flash unit, it is impossible to match the exposure level between an external flash and the built-in flash. However, we are pleased to advise
that an adjustment to the Program Flash 5600HS(D) or 3600HS(D) is available, which will enable you to achieve a
similar exposure level to that of the built-in flash. For further assistance,
please contact your nearest Konica Minolta authorized service station.

Please rest assured that adjustment of Program Flash 5600HS(D) or 3600HS(D) will have no affect on its performance either with film cameras, or with other digital cameras.

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Old Oct 17, 2005, 9:31 AM   #2
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Location: Savannah, GA (USA)
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Unfortunately, because you lose OTF (Off the Film) metering for flash exposures with Digital (the sensors are too reflective to use for this purpose), some issues have come up that require some changes. One of these is recalibrating the flashes so that the preflash used to help determine exposure is better matched to the newer Digital models.

If you scroll down in the list of forum threads in this forum, you'll see another thread on this topic:

Flash Exposure Issues with the 7D
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