I've recently been concerned about many underexposed photos I've made
using the D300 and and SB800. Here is a sample shot:
http://nazca.elizaga.net/under.html
The SB800 was set to Remote, Channel 1, Group A.
The flash control for built-in flash of the D300 was set to Commander
mode, Built-in flash --, Group A, Compensation 0, Channel 1.
Below is the EXIF data. Two entries seems to indicate the cause of the
problem:
"Light Source = unknown"
"Flash = Flash fired, compulsory flash mode, return light not detected".
What do these two entries mean?
Here's the EXIF data:
[Image]
Make = NIKON CORPORATION
Model = NIKON D300
Orientation = top/left
Software = Nikon Transfer 1.1 W
Date Time = 2008-08-23 11:12:37
[Camera]
Exposure Time = 1/60"
F Number = F5.6
Exposure Program = Manual
ISO Speed Ratings = 400
Exif Version = Version 2.21
Date Time Original = 2008-08-22 09:40:43
Date Time Digitized = 2008-08-22 09:40:43
Exposure Bias Value = +0.33EV
Max Aperture Value = F4.14
Metering Mode = Pattern
Light Source = unknown
Flash = Flash fired, compulsory flash mode, return light not detected
Focal Length = 30mm
Maker Note = 7999 Byte
User Comment =
Subsec Time = 0.77"
Flashpix Version = Version 1.0
Color Space = sRGB
Exif Image Width = 3216
Exif Image Height = 2136
Sensing Method = One-chip color area sensor
File Source = DSC
Scene Type = A directly photographed image
Custom Rendered = Normal process
Exposure Mode = Manual exposure
White Balance = Auto white balance
Digital Zoom Ratio = 1x
Focal Length In 35mm Film = 45mm
Scene Capture Type = Normal
Gain Control = Low gain up
Contrast = Normal
Saturation = Normal
Sharpness = Hard
Subject Distance Range = unknown
[Thumbnail]
Thumbnail = 160 x 120
[MakerNote (Nikon)]
Makernote Version = 0210
ISO Speed Used = 400
Quality = FINE
White Balance = AUTO
Focus Mode = AF-S
Flash Setting = NORMAL
Auto Flash Mode = Comdr.
White Balance Bias Value = 0, 0
White Balance Red, Blue Coefficients = 500390625/100000000,
500390625/100000000, 390625/100000000, 390625/100000000
000D = 00, 01, 06, 00
Exposure Diff = DA, 01, 0C, 00
ThumbOffset = 7993
ISO Speed Requested = 400
Photo corner coordinates = 0, 0, 3216, 2136
AE Bracket Compensation Applied = 0EV
Lens Type = Nikon D series Lens
Lens Min/Max Focal Length, Max Aperture = 18/1, 55/1, 35/10, 56/10
Flash Used = Flash Fired
Bracketing & Shooting Mode = 0
008A = 1
008B = 40, 01, 0C, 00
Lighting Type = NATURAL
Total Number of Shutter Releases for Camera = 2022
--
Elson T. Elizaga
http://elizaga.net
http://misamisoriental.elizaga.net
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