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Canon Digital Rebel: focus distance miscalculation?

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Old August 22nd 04, 09:03 PM
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Default Canon Digital Rebel: focus distance miscalculation?

I was having some flash exposure problems with a Canon Digial Rebel
D300 with a Canon 400EX flash. When looking at the EXIF data, I
noticed two anomalies:

1) Two pictures (family snapshots) were taken within a few seconds of
each other, at approximately the same distance, same focal length,
same exposure, but the EXIF data says that the "Subject distance" for
one picture is at 3.14 meters and the other is at 5.46 meters. The
focus points for the two pictures are different but all the focus
points are on the four people in my family in the foreground. Is
there any good explanation for this large discrepancy?

2) Looking a handful of pictures from the same session, multiple
photos show up with the distance as 5.46 meters. The photographer was
moving around, so the chances that he was at exactly the same distance
(to within .01 meters) seems unlikely. There are actually several
other numbers that appear multiple times. Is this a camera problem?
If not, then why does Canon show the inaccurate information with such
apparent precision?

(I've noticed that the Subject distance only seems to show up with the
flash, so don't expect to see this information for your non-flash


-- jeff


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