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11-24-2015, 06:38 PM   #1
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Half Dark images

Hi,

i am trying to take photos setting the flash of camera and triggering them with Yongnuo RF-603 II N3
At 1/125 the image seems to be fine but at 1/160 or 1/180 i am getting half dark images.

Can any body tell me what i am doing wrong.

Added images both have same settings except for shutter speeds.

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11-24-2015, 07:01 PM   #2
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The max sync speed is 1/160 for the k-5.Your seeing the curtain moving up in the shot at 1/180 causing the dark spot.Shoot at 1/160 or less or use high speed sync flash at shutter speeds above 1/160.
11-24-2015, 08:00 PM   #3
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Also check the batteries on the 603. I've had trouble with mine giving the occasional half dark frame when the batteries are low and I'm near sync speed.
11-24-2015, 08:20 PM   #4
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QuoteOriginally posted by bschriver11 Quote
The max sync speed is 1/160 for the k-5.Your seeing the curtain moving up in the shot at 1/180 causing the dark spot.Shoot at 1/160 or less or use high speed sync flash at shutter speeds above 1/160.
My K-5 picks 1/180 as the sync speed in X mode.

At first I thought that the sync speed might change depending on whether the menu is set to 1/3 or 1/2 EV steps but I tested and it's 1/180 sync speed regardless of the menu setting. In Manual I can't select 1/180 (it jumps from 1/160 to 1/200 shutter) while in X mode it picks 1/180.

11-24-2015, 08:36 PM   #5
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My bad 1/180 is the sync speed of the K-5.It looks like the curtain is coming up in the photo at 1/180.

---------- Post added 11-24-2015 at 10:48 PM ----------

Yongnuo RF-603 II product specs.. The highest flash sync speed up to 1/320 second (some of models may only reach to 1/250s or less, difference combination of models of flash and camera using may achieved difference flash sync speed)?
11-24-2015, 09:02 PM   #6
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The camera should know when exactly the flash should ignite, depending on shutter electronics and mechanics.

In the old days, there was a mechanic coupling between start of the first curtain and closing the contact for flash ignition.
Nowadays this is likely be done by electronics, so there could also be a quirk that results in sending the signal about 0.005 sec later than it should.
11-24-2015, 09:18 PM   #7
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I have a K-30 i tried on it too i am getting the same thing , at 1/160 the black bar is little lower.
Two cameras behaving in same way at (1/160,1/180) .

Will try with new batteries as milewis suggested.

Cameras tried on K5II and K-30
11-25-2015, 12:03 AM   #8
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This really sounds like a firmware issue with the camera and the non-mfg. flash unit. There is a lag in the flash firing, which should not happen based on the specs of both the K5iis or the Yongnuo. Isn't the "N3" in the remote flash model designed for compatibility with Nikon DSLRs?

11-25-2015, 03:34 AM   #9
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QuoteOriginally posted by krishna203 Quote
i am trying to take photos setting the flash of camera and triggering them with Yongnuo RF-603 II N3. At 1/125 the image seems to be fine but at 1/160 or 1/180 i am getting half dark images.
The triggering should work at 1/180s as well (in principle).

I have a K-5 II and a K100D and both trigger at 1/180s without bars with Cactus V5 or V6 triggers.

If you see a black bar, it means the triggers cause too much of a delay. The Yongnuo RF-602 too were known to only support 1/160s unless one used a "wake up" trick. I would not have thought that the same is still required for the RF-603, but perhaps have a search to see whether a related trick exists or whether someone reports on the Canon version of the RF-603 working while the Nikon version is not, or vice versa.

Yongnuo triggers are system-specific (Canon or Nikon) and are therefore more prone to cause issues on a Pentax camera that they weren't designed for. There is an old thread in which several users report the RF-603 to not work properly with Pentax, but also one user who says they do.

QuoteOriginally posted by Alex645 Quote
This really sounds like a firmware issue with the camera and the non-mfg. flash unit.
I think it is safe to rule out the camera as a problem.

The problem occurs with two different cameras of the OP and other triggers work just fine with my K-5 II.
The interaction between a camera and a non-system-dedicated trigger is really simple: It only requires the centre pin of the hot-shoe (and ground, of course). The camera provides the trigger signal (shorts the centre pin against ground) at the right time and if one sees a bar, that just means there is too much of a delay introduced by the trigger.

Perhaps the RF-603 can be made to work by isolating all other pins, except the centre pin, or by somehow waking it up before the shot is taken.
11-25-2015, 06:49 AM   #10
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1/160 is only the closest 1/3 stop just below 1/180 (max synch) when choosing thirds of stops as exposure increments instead of half stops.
1/250 as on the Nikons for instance is a full stop so no "misunderstandings" there.

Last edited by LensBeginner; 11-25-2015 at 07:04 AM.
11-25-2015, 12:45 PM   #11
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If delay by the trigger is the reason, you may be able to check this by switching to trailing curtain synchronisation.

Chance is (depending on where the offset calc is done) you will see a black bar on the opposite side.
But now probably independend from exposure time.
11-25-2015, 03:38 PM   #12
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QuoteOriginally posted by RKKS08 Quote
If delay by the trigger is the reason, you may be able to check this by switching to trailing curtain synchronisation.
Second curtain sync is not available when using such triggers.

However, mounting the flashgun on the camera directly, without using triggers at all, would be a good test to see whether the delay is introduced by the triggers.
11-27-2015, 03:10 PM   #13
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QuoteOriginally posted by Class A Quote
Second curtain sync is not available when using such triggers.

However, mounting the flashgun on the camera directly, without using triggers at all, would be a good test to see whether the delay is introduced by the triggers.
i tried by mounting the flash on camera and i didn't see any issues at 1/160 or 1/180 of the second.
With HSS even at 1/500 i don't see any issues, looks like the triggers are causing the delay.
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