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FORUMS General Gear Talk Flash and Studio Lighting
Thread started 19 Mar 2008 (Wednesday) 20:32
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420EX + Rebel XT Question

digirebelva's Avatar
Joined Mar 2008
Appomattox, Virginia
Mar 19, 2008 20:32 |  #1

Okay somebody help me understand this. While playing around with my 420ex on top of my rebel XT, I was alternating between aperture-shutter-program mode. Using program mode the camera was happy with 1/60 & F5.6, shooting at something on my wall about 8 feet away. When using either aperture or shutter priority, the camera wasnt happy until the shutter speed was around 0"3. Why such a difference in shutter speeds. I mean the flash went off everytime, the subject did not change nor did the distance.

EOS 6d, 7dMKII, Tokina 11-16, Tokina 16-28, Sigma 70-200mm F/2.8, Sigma 17-50 F/2.8, Canon 24-70mm F/2.8L, Canon 70-200 F/2.8L, Mixed Speedlites and other stuff.

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JeffreyG's Avatar
15,248 posts
Gallery: 34 photos
Joined Jan 2007
Detroit, MI
Mar 19, 2008 20:55 |  #2

Av and Tv modes always assume the flash is for fill only and the camera will meter for ambient.

P mode below EV 13 assumes the flash is the prime light source and the camera meter underexposes as needed.

M mode is typically the most consistent for shooting with flash as the prime light source.

My personal stuff:​photos/jngirbach/sets/ (external link)
I use a Canon 5DIII and a Sony A7rIII


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420EX + Rebel XT Question
FORUMS General Gear Talk Flash and Studio Lighting

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