can someone identify the problem? images posted

as i was shooting a session few weeks ago i have noticed these shadow bars on my images as shown here. And now this last weekend i got this nasty one as you can see it with the baby shot. the last nasty shot was just one that turned out this way out of 200 shots taken. the previous two with the boy turned out to be just 3 out of 160. i used at least 2 580ex(qbox and umbrella) with 5Dmk2 with YNrf-602 triggers shot at 1/160.
any help please??
these where just random shots.

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really? i just bought this camera from a local guy and he said it only has 2k shots. he bought it last march. i've been shooting randomly for 5 days now and i can't recreate same problem.

(previuos post got deleted !?!?!)

What shutter speed are you using?

To be honest, the first two look like the problem is with the lighting since I see the same shadow getting darker. The third looks like something got in front of the lens.

Do you have anything between the flash and the subject?

RandyMN wrote in post #12268896
What shutter speed are you using?

The OP stated it was 1/160.

looks like a sync speed issue to me, are you sure you were shooting at 1/160th?

RandyMN wrote in post #12268909
To be honest, the first two look like the problem is with the lighting since I see the same shadow getting darker. The third looks like something got in front of the lens.

Do you have anything between the flash and the subject?

no not really. see i was thingking the same, that maybe something got in the way but then how come i didn't see it in the viewfinder when i was shooting? i also used my 7D there with no problems.

tolyD wrote in post #12268888
really? i just bought this camera from a local guy and he said it only has 2k shots. he bought it last march. i've been shooting randomly for 5 days now and i can't recreate same problem.

(previuos post got deleted !?!?!)

To put this in context, you are responding to my deleted post saying I think the shutter may be failing. I removed it when I noticed you are using a studio flash setup, which I know almost nothing about.

What I do know is that my MKIIN showed similar behavior just before an Err99 and shutter replacement. Without a flash.

suecassidy wrote in post #12268925
looks like a sync speed issue to me, are you sure you were shooting at 1/160th?

i just double checked and it have 160 on all of them.

I wonder if the remote trigger is having problems synching?

Sounds like the remote fired late

S.Horton wrote in post #12268934
To put this in context, you are responding to my deleted post saying I think the shutter may be failing. I removed it when I noticed you are using a studio flash setup, which I know almost nothing about.

What I do know is that my MKIIN showed similar behavior just before an Err99 and shutter replacement. Without a flash.

do you rememeber the shutter count on that body when it happened?

Drozz119 wrote in post #12268947
Sounds like the remote fired late

i hope thats the case and not my camera or i will have to track that guy down that sold it to me lol

Looks like there is lots of lag in the third picture thus causing the curtain to show in the frame.
Dont know about the first two, thou. Might be the same thing but not as important as the third picture because there was also some available light.

tolyD wrote in post #12268954
i hope thats the case and not my camera or i will have to track that guy down that sold it to me lol

Trigger a shot at 1/320 and 1/400 with the same setup and see if it looks similar. Or try another trigger. Do you turn the camera clockwise for portrait mode? Are you lefty?