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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 01 Jan 2015 (Thursday) 23:17
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Hello all Please read this and try to help me

 
tthorn0118
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Jan 01, 2015 23:17 |  #1

My EOS Rebel t3i I just got is acting funny when I try to shoot with the flash. Does not matter the mode I am in when I use the flash only 3 out of 8 or 10 pictures come out exposed with the flash. Even though I can visibly see the flash firing. It's like the flash is firing too soon or too late. The camera is brand new and it is really frustrating to me. Also sometimes the flash fires very weak. I have even tried raising the flash exposure compensation all the way up. But it is random when my shots come out exposed or not. Like I said I can visibly see the flash firing when I take the shot. However, most shots come out not exposed at all with the flash. Is this a timing issue with the curtain and flash sync? What can I do about it if anything? Thank you all for reading.




  
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gonzogolf
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Jan 01, 2015 23:26 |  #2

Built in flash?




  
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tthorn0118
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Jan 01, 2015 23:28 as a reply to  @ gonzogolf's post |  #3

Yes it is the built in flash.




  
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nqjudo
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Jan 01, 2015 23:59 |  #4

Without knowing exactly what it is you're trying to light up and under what conditions it is tough to say whether or not it might be a flash problem. I'm assuming this is a new camera and the settings have been played with a lot. Do a reset on the settings to see if that helps. If not some more information would be helpful. Don't forget that a flash is not a magic bullet for proper exposure. Like anything else DSLR you're going to have to learn to read a scene and adjust exposure appropriately.


No photographer is as good as the simplest camera. - Edward Steichen.

  
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rrblint
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Jan 02, 2015 00:05 |  #5

How far away from your subject are you? Also it would help greatly if you could post some examples. Make sure that the complete EXIF is attached.


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tthorn0118
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Jan 02, 2015 00:27 as a reply to  @ rrblint's post |  #6

I have tried to reset all settings twice to no avail. Say for example I am using a shutter speed of 1/125 and aperture of F11 with ISO 400. I pop my flash open and when I take the shot the flash goes off and I can hear the shutter sound. But given my lighting isn't that great(just ambient living room light) I expect to see the photo being exposed by the flash. Well I do not and I am well in the range of the flash. Only a foot away or so. My picture comes out very dark almost black. So let's pretend I used the exact same settings above with no flash. Anyone who knows photography would know that in a dimly lit room that the shot would obviously be underexposed. Small aperture + quick shutter speed + fairly low ISO + low lighting = underexposure. I won't bother uploading the picture because it is black. No exposure at all. Here is the EXIF Data:

Make Canon
Camera Model Name Canon EOS REBEL T3i
Preview Image Start 56,904
Orientation Horizontal (normal)
Preview Image Length 470,687
Modify Date 2015:01:02 01:15:57
2 hours, 52 minutes, 46 seconds ago
Exposure Program Manual
Sensitivity Type Recommended Exposure Index
Recommended Exposure Index 400
Exif Version 0230
Date/Time Original 2015:01:02 01:15:57
2 hours, 52 minutes, 46 seconds ago
Create Date 2015:01:02 01:15:57
2 hours, 52 minutes, 46 seconds ago
Components Configuration Y, Cb, Cr, -
Shutter Speed Value 1/128
Aperture Value 11.31
Exposure Compensation 0
Metering Mode Multi-segment
Flash On, Fired
Focal Length 41.0 mm
F Number 11.00
Exposure Time 1/125
Owner Name
Lens Model EF-S18-55mm f/3.5-5.6 IS II
Color Space sRGB
Lens Serial Number 00004bc085
Maker Note Canon (6,908 bytes binary data)
User Comment
Sub Sec Time 63
Sub Sec Time Original 63
Sub Sec Time Digitized 63
Flashpix Version 0100
Interoperability Index R98 - DCF basic file (sRGB)
Interoperability Version 0100
Focal Plane X Resolution 5728.176796
Focal Plane Y Resolution 5808.403361
Focal Plane Resolution Unit inches
Custom Rendered Normal
Exposure Mode Manual
White Balance Auto
Scene Capture Type Standard
Serial Number 322076147055
Lens Info 18-55mm f/?
Thumbnail Length 1,856
Image Width 668
Image Height 432
Bits Per Sample 8 8 8
Bits Per Sample 16 16 16
Compression Uncompress​ed
Compression JPEG (old-style)
Image Size 5,184 × 3,456
Photometric Interpretation RGB
Strip Offsets 527,592
Rows Per Strip 432
Strip Byte Counts 16,840,640
Strip Byte Counts 1,731,456
SRaw Type 3
Exif 0xc6dc 649 432 19 0
Exif 0xc5d8 1
Exif 0xc5e0 3
Raw Image Segmentation 2 1728 1888
Resolution 72 pixels/inch
Strip Offsets 2,264,296
Samples Per Pixel 3
Planar Configuration Chunky
Exif 0xc5d9 2
SRaw Type 1
ISO 400




  
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rrblint
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Jan 02, 2015 01:01 |  #7

f11 is a very small aperture for the tiny onboard flash. Try a shot with the lens wide open.


Mark

  
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Lenty007
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Jan 02, 2015 01:03 |  #8

SAME HERE!
I never use the built in flash but my wife does.
The flash can't be trusted in any setting EXEPT THE GREEN SETTING! (By all means!).
So in our case problem solved and I'm not troubled.
In case YOUR green setting should not work I would send it to repair (or use the money for an external flash).
Greeting,

Alain




  
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tthorn0118
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Jan 02, 2015 01:22 |  #9

Yeah even with aperture wide open @ F3.5 (largest the kit lens allows) the flash doesn't expose my shot. Even though I can see it firing and confirm it in the EXIF. Probably a sync issue with the curtain? The flash is probably firing too soon or too late you think?




  
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rrblint
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Jan 02, 2015 01:32 |  #10

One more thing that you can try: Try it in "Green Box"(A+) mode.


Mark

  
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Bob_A
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Jan 02, 2015 02:15 |  #11

It sounds to me like you have your flash set to EasyWireless instead of NormalFiring. What you are seeing is likely the preflash used to send a signal to an off-camera flash (which you don't have).

Under the Camera tab in your on-board menu select Flash Control (set) then "Built-in flash func. setting" (set).


Bob
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Canon ­ Amateur
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Jan 02, 2015 02:49 |  #12

I found this article about flash which helped me a lot.
http://photonotes.org/​articles/eos-flash/ (external link)


Canon EOS 1D Mark IV / Canon EOS M3 / Lytro illum

  
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tthorn0118
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Jan 02, 2015 10:02 as a reply to  @ Canon Amateur's post |  #13

Thank you all. It even does this in full auto mode. I guess it is time to call Canon.




  
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Full ­ Auto ­ Shooter
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Jan 02, 2015 17:52 |  #14

you might well be seeing the "pre-flash" that is used to obtain flash exposure maybe? If you're using continuous shooting mode some of your shots the flash may not be firing. Are you on single shooting mode?




  
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tthorn0118
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Jan 02, 2015 19:58 as a reply to  @ Full Auto Shooter's post |  #15

Single shooting and I know the difference between the pre fire of the flash and the actual flash firing.




  
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Hello all Please read this and try to help me
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