Flash sync problem!

Savvas · 12-06-2014, 08:37 AM

Hi i've been having problems lately with my wireless flash trigger, i have the Comtrig T320-TX.
The problem is that whenever i take a shot the flash does trigger, but only after i've taked the shot.
(It triggers after the shutter has closed)
Is there any thing i can do to fix this sync problem? or should the trigger go in the trash.
When i put my flash on the camera the sync is accurate but when on the wireless trigger it doesn't work.

Thanks in advance!

**maxfield_photo** · 12-06-2014, 08:46 AM

I'm not familiar with the Comtrig brand, but some radio triggers are slow to relay their signals. It would have to be slow indeed to completely miss the flash entirely. The classic symptom of a slow trigger is a black bar at one edge of the frame when shooting at or near max sync speed, (1/180th in the case of most Pentax cameras). Try slowing your shutter speed down to maybe 1/90th and see if you can capture anything. If you are getting black bars at 1/90th, it's probably time to get a new trigger system.

Savvas · 12-06-2014, 09:03 AM

When i shoot at eg. 3sec shutterspeed than the flash triggers after the camera has taken the shot, when i shoot at 1/50 the flash triggers after I've taken the shot. it's really weird. But if there is any solution please help!

**maxfield_photo** · 12-06-2014, 09:36 AM

After reading a review of the Comtrig 320, they seem to be pretty fast, so sync speed should not affect the results. Double check the following things:

Make sure you have the unit marked TX on your camera, and the RX unit attached to the flash.
Make sure both units are set to the same channel
In you camera's flash menu, make sure you have it set to first-curtain sync.
If you flash has an option, make sure it is set to first-curtain sync.

MPrince · 12-08-2014, 02:04 PM

In addition to maxfield's excellent suggestions, make sure you have fresh batteries in the triggers.

noblepa · 12-08-2014, 02:59 PM

Do you perhaps have your camera set for trailing flash sync? This is a setting that causes the camera to trigger the flash just before the shutter closes.

Combine this with a trigger that is a little slow to fire the off-camera flashes and you could get exactly the symptoms you describe.

You didn't say which camera you have, so I can't help you in finding the menu setting to change from trailing to leading flash.

12-06-2014, 08:37 AM	#1
Savvas New Member Join Date: Jan 2013 Photos: Gallery Posts: 11	Flash sync problem! Hi i've been having problems lately with my wireless flash trigger, i have the Comtrig T320-TX. The problem is that whenever i take a shot the flash does trigger, but only after i've taked the shot. (It triggers after the shutter has closed) Is there any thing i can do to fix this sync problem? or should the trigger go in the trash. When i put my flash on the camera the sync is accurate but when on the wireless trigger it doesn't work. Thanks in advance!

12-06-2014, 09:36 AM	#4
maxfield_photo Site Supporter Join Date: Mar 2011 Location: Cincinnati, OH Posts: 1,216	After reading a review of the Comtrig 320, they seem to be pretty fast, so sync speed should not affect the results. Double check the following things: Make sure you have the unit marked TX on your camera, and the RX unit attached to the flash. Make sure both units are set to the same channel In you camera's flash menu, make sure you have it set to first-curtain sync. If you flash has an option, make sure it is set to first-curtain sync.

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12-06-2014, 08:46 AM	#2
maxfield_photo Site Supporter Join Date: Mar 2011 Location: Cincinnati, OH Posts: 1,216	I'm not familiar with the Comtrig brand, but some radio triggers are slow to relay their signals. It would have to be slow indeed to completely miss the flash entirely. The classic symptom of a slow trigger is a black bar at one edge of the frame when shooting at or near max sync speed, (1/180th in the case of most Pentax cameras). Try slowing your shutter speed down to maybe 1/90th and see if you can capture anything. If you are getting black bars at 1/90th, it's probably time to get a new trigger system.

12-06-2014, 09:03 AM	#3
Savvas New Member Join Date: Jan 2013 Photos: Gallery Posts: 11 Original Poster	When i shoot at eg. 3sec shutterspeed than the flash triggers after the camera has taken the shot, when i shoot at 1/50 the flash triggers after I've taken the shot. it's really weird. But if there is any solution please help!

12-08-2014, 02:04 PM	#5
MPrince Veteran Member Join Date: Sep 2006 Location: WV Posts: 1,495	In addition to maxfield's excellent suggestions, make sure you have fresh batteries in the triggers.

12-08-2014, 02:59 PM	#6
noblepa Veteran Member Join Date: Sep 2007 Location: Bay Village, Ohio USA Posts: 1,142	Do you perhaps have your camera set for trailing flash sync? This is a setting that causes the camera to trigger the flash just before the shutter closes. Combine this with a trigger that is a little slow to fire the off-camera flashes and you could get exactly the symptoms you describe. You didn't say which camera you have, so I can't help you in finding the menu setting to change from trailing to leading flash.