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<blockquote data-quote="Dave_W" data-source="post: 84866" data-attributes="member: 9521"><p>That is a "flash tag" that describes exactly what occurred during your shoot. Here's a PDF with a list of all the different EXIF tags. Here's a short list from the link below of the various flash tags available</p><p></p><p>Resulting Flash tag values. </p><p>0000.H = Flash did not fire. </p><p>0001.H = Flash fired. </p><p>0005.H = Strobe return light not detected. </p><p>0007.H = Strobe return light detected. </p><p>0009.H = Flash fired, compulsory flash mode </p><p>000D.H = Flash fired, compulsory flash mode, return light not detected </p><p>000F.H = Flash fired, compulsory flash mode, return light detected </p><p>0010.H = Flash did not fire, compulsory flash mode </p><p>0018.H = Flash did not fire, auto mode </p><p>0019.H = Flash fired, auto mode </p><p>001D.H = Flash fired, auto mode, return light not detected </p><p>001F.H = Flash fired, auto mode, return light detected </p><p>0020.H = No flash function </p><p>0041.H = Flash fired, red-eye reduction mode </p><p>0045.H = Flash fired, red-eye reduction mode, return light not detected </p><p>0047.H = Flash fired, red-eye reduction mode, return light detected </p><p>0049.H = Flash fired, compulsory flash mode, red-eye reduction mode </p><p>004D.H = Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected </p><p>004F.H = Flash fired, compulsory flash mode, red-eye reduction mode, return light detected </p><p>0059.H = Flash fired, auto mode, red-eye reduction mode </p><p>005D.H = Flash fired, auto mode, return light not detected, red-eye reduction mode </p><p>005F.H = Flash fired, auto mode, return light detected, red-eye reduction mode </p><p>Other = reserved </p><p></p><p><a href="http://www.exif.org/Exif2-2.PDF" target="_blank">http://www.exif.org/Exif2-2.PDF</a></p><p></p><p>As for specifically what it means, I can only guess that compulsory mode means you force the flash on rather than a low light detection setting, return light not detected means that no information was recorded from that specific flash. </p><p></p><p>Oh, I just found a better definition from a flicker site (see <a href="http://www.flickr.com/groups/10206545@N00/discuss/72157623953765845/" target="_blank">HERE</a>)</p><p></p><p><span style="color: #000000"><span style="font-family: 'Arial'">That EXIF data relates to TTL. The "return not detected" indicates that no TTL information was obtained from the flash in question. However it is only reflecting the status of the on-camera flash (whatever's on the hotshoe or the popup). "Return not detected" usually occurs if the camera didn't get a return value for the onboard flash in TTL mode and it's meant to indicate that the flash was not effective against the subject. If the onboard flash was set to not contribute then that would be a correct indication.</span></span></p><p></p><p><span style="color: #000000"><span style="font-family: 'Arial'">It can also sometimes occur if the camera cannot adequately distinguish between the light from the off camera flash with respect to the onboard flash. That is to say that if the light from the off-camera flashes contribute significantly enough to the exposure that the on-camera flash becomes negligible then you will also get "return not detected" in the EXIF.</span></span></p><p><span style="color: #000000"><span style="font-family: 'Arial'"></span></span></p></blockquote><p></p>
[QUOTE="Dave_W, post: 84866, member: 9521"] That is a "flash tag" that describes exactly what occurred during your shoot. Here's a PDF with a list of all the different EXIF tags. Here's a short list from the link below of the various flash tags available Resulting Flash tag values. 0000.H = Flash did not fire. 0001.H = Flash fired. 0005.H = Strobe return light not detected. 0007.H = Strobe return light detected. 0009.H = Flash fired, compulsory flash mode 000D.H = Flash fired, compulsory flash mode, return light not detected 000F.H = Flash fired, compulsory flash mode, return light detected 0010.H = Flash did not fire, compulsory flash mode 0018.H = Flash did not fire, auto mode 0019.H = Flash fired, auto mode 001D.H = Flash fired, auto mode, return light not detected 001F.H = Flash fired, auto mode, return light detected 0020.H = No flash function 0041.H = Flash fired, red-eye reduction mode 0045.H = Flash fired, red-eye reduction mode, return light not detected 0047.H = Flash fired, red-eye reduction mode, return light detected 0049.H = Flash fired, compulsory flash mode, red-eye reduction mode 004D.H = Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected 004F.H = Flash fired, compulsory flash mode, red-eye reduction mode, return light detected 0059.H = Flash fired, auto mode, red-eye reduction mode 005D.H = Flash fired, auto mode, return light not detected, red-eye reduction mode 005F.H = Flash fired, auto mode, return light detected, red-eye reduction mode Other = reserved [URL]http://www.exif.org/Exif2-2.PDF[/URL] As for specifically what it means, I can only guess that compulsory mode means you force the flash on rather than a low light detection setting, return light not detected means that no information was recorded from that specific flash. Oh, I just found a better definition from a flicker site (see [URL="http://www.flickr.com/groups/10206545@N00/discuss/72157623953765845/"]HERE[/URL]) [COLOR=#000000][FONT=Arial]That EXIF data relates to TTL. The "return not detected" indicates that no TTL information was obtained from the flash in question. However it is only reflecting the status of the on-camera flash (whatever's on the hotshoe or the popup). "Return not detected" usually occurs if the camera didn't get a return value for the onboard flash in TTL mode and it's meant to indicate that the flash was not effective against the subject. If the onboard flash was set to not contribute then that would be a correct indication.[/FONT][/COLOR] [COLOR=#000000][FONT=Arial]It can also sometimes occur if the camera cannot adequately distinguish between the light from the off camera flash with respect to the onboard flash. That is to say that if the light from the off-camera flashes contribute significantly enough to the exposure that the on-camera flash becomes negligible then you will also get "return not detected" in the EXIF. [/FONT][/COLOR] [/QUOTE]
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