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Auto Iso and Flash. How do they interact?

yoshi81

AU
18 posts

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yoshi81 Registered since 25th Nov 2007
Mon 01-Sep-08 02:14 AM

Hi team,

I currently have a D300 and a SB-600 flash. I currently have my auto iso set to kick in at 1/30, and my flash shutter speed set at 1/30. I have noticed that when I shoot in daylight with good light using my flash as fill, my pictures are taken at high iso settings (which varies in the amount the iso is raised). I usually shoot in appeture priority, but occasionally in P mode. Please note that this happens when I set the appeture to "wide open" at short focal lengths (I have a 18-200mm VR lens). Is this occuring because when using flash my shutter speed to 1/30, and this inturn arbitarily boosts my iso via the auto iso function (but this doesn't explain the variability in iso setting)? How would you remedy this? Would you change the flash shutter speed or the auto iso boost shutter speed?

http://paulhuang.smugmug.com

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