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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 14 Nov 2016 (Monday) 22:51
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Flash problems?

 
Evertking
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Nov 14, 2016 22:51 |  #1

I was practicing taking portraits and one of my flashes started making lines across the images. Not the black sync line but just a bright line or two across the whole image and does it bare and in a modifier. I'm stumped.




  
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98kellrs
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Nov 14, 2016 23:24 |  #2

Maybe post up an example?


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Bassat
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Nov 15, 2016 03:16 |  #3
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What camera, lens, flash?
What shutter speed?
How is the flash being fired (on-shoe/622/pc-sync)?

And post an example, preferrably with EXIF intact.




  
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Left ­ Handed ­ Brisket
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Nov 15, 2016 04:56 |  #4

I'm going out on a limb, and saying is is a camera problem, not a flash problem.

Definitely need an example.


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MrScott
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Nov 15, 2016 08:36 |  #5

Are both flashes the same model, feature and trigger? Sounds like you have on flash in a High Sync mode and the second is not capable, but triggering. The second light is much brighter than the first, but is only exposed to the part of the sensor that is showing the bright line. IF you hold the camera in any other angle, is the white line in the exact same area of the photo?




  
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Wilt
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Post edited over 4 years ago by Wilt.
     
Nov 15, 2016 08:56 |  #6

Left Handed Brisket wrote in post #18184889 (external link)
I'm going out on a limb, and saying is is a camera problem, not a flash problem.
Definitely need an example.

MrScott wrote in post #18184996 (external link)
Are both flashes the same model, feature and trigger? Sounds like you have on flash in a High Sync mode and the second is not capable, but triggering. The second light is much brighter than the first, but is only exposed to the part of the sensor that is showing the bright line. IF you hold the camera in any other angle, is the white line in the exact same area of the photo?

Good guess! OP needs to state the shutter speed at which he has his camera set, and that will go a long way to affirming your hypothesis.


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Evertking
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Post edited over 4 years ago by Evertking.
     
Nov 15, 2016 11:30 |  #7


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Sorry took so long.. I was home for a min and got a image to show what I'm talking about.
Thanks for the help. You know, now that I think about it, I was outside the day before and used that flash in HSS and maybe that could be the issue.



  
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MrScott
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Nov 15, 2016 12:29 as a reply to  @ Evertking's post |  #8

Any mirrors or frosted glass doors in that room?




  
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Gart
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Nov 15, 2016 12:56 |  #9

Tell us how you had the lights set up.

The striping appears to only be in the background versus coming across your wife and child's face. As distinct as the stripes are in the background, they don't seem to be affecting your subjects.

Gart




  
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Wilt
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Post edited over 4 years ago by Wilt.
     
Nov 15, 2016 14:11 |  #10

Puzzling...

  • it seems to affect the b/g but not the f/g.
  • Photo is shot at 1/200 on a 5D so an ETTL flash would not be getting cirect HSS commands from the camera, but a studio strobe with HSS support might be in manually selected HSS (long duration) mode,
  • yet at 1/200 the 5D shutter curtains are fully open (not slit opening)
  • and the bands are not parallel to the frame top/bottom

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Evertking
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Nov 15, 2016 15:22 |  #11

No.. no mirrors. I had two flashes set up. One key and one fill and noticed that and turned one off till I found the one doing the stripes, replaced it with another flash and all was fine.




  
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MrScott
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Nov 15, 2016 19:12 as a reply to  @ Evertking's post |  #12

So, if you took a photo with just the bad flash, you could reproduce the issue 100%? Was that "fill" begins her left shoulder?




  
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Left ­ Handed ­ Brisket
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Post edited over 4 years ago by Left Handed Brisket.
     
Nov 16, 2016 05:38 |  #13

Wilt wrote in post #18185305 (external link)
Puzzling...

  • it seems to affect the b/g but not the f/g.
  • Photo is shot at 1/200 on a 5D so an ETTL flash would not be getting cirect HSS commands from the camera, but a studio strobe with HSS support might be in manually selected HSS (long duration) mode,
  • yet at 1/200 the 5D shutter curtains are fully open (not slit opening)
  • and the bands are not parallel to the frame top/bottom

check the area between the mouth and nose of the woman and then camera right, the banding can be seen there and a bit on the child's arm in the blue area.

my first thought was HSS too, but i agree, your points uh, point to another issue. Long duration on a strobe would obviously not cause this type problem.

wondering if the issue is:

- present in non flash photography
- consistent in placement with different images
- the 5DC has had the shutter fix (was it a shutter fix that was a recall issue? or was it a mirror fix?)

edit: i'm maybe second guessing seeing it being on the subjects, very hard to tell with this single example.


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
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Left ­ Handed ­ Brisket
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Nov 16, 2016 05:47 |  #14

Evertking wrote in post #18185366 (external link)
No.. no mirrors. I had two flashes set up. One key and one fill and noticed that and turned one off till I found the one doing the stripes, replaced it with another flash and all was fine.

sorry, it's early still, just getting full of coffee and did not catch this post.

if the issue is consistent with the flash in question, that is a big, "hmmmm?"

i would test the "bad" flash again and see if the problem is repeatable. If you have a shutter issue, it might have cleared itself up, at least temporarily.


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
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Bassat
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Nov 16, 2016 06:41 |  #15
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Just swag'n here, but is there any way this could be due to fluorescent 'flicker' that is hitting the back wall and not the subjects? That usually manifests as a WB/exposure issue. It's hard to tell WB on a white/grey wall.




  
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Flash problems?
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