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Ron Evans
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1/2 Image & sync cord?


 
 
I just received my Alien Bees lighting kit and was experimenting tonight. I got maybe 5 shots off and then started getting 1/2 images (see examples). If I unplug the sync cord, I get the full image. I'm shooting with a Canon 40D and have never used a sync cord or had this problem in the past. Please tell me this happens for a reason and it's not my camera. Thanks.


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3/6/2009 5:30:06 PM

 
Jeffrey R. Whitmoyer   It looks like your shutter speed is too fast to sync with the flash units. Check your camera sync speed and make sure the shutter is set at a speed slower than sync speed.
Jeff


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3/6/2009 6:15:09 PM

 
Dennis Flanagan
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  Ditto. Your shutter speed is too fast. I shoot Nikon and 1/250 is the fastest speed I can shoot without this happening.


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3/7/2009 1:39:15 AM

 
John H. Siskin
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  Hi Ron,
The strobe has a very short duration, on the order of 1/1000 of a second. So if the shutter is only partially open you get only part of a picture. The strobe is not on for the entire time the shutter is moving, and the shutter does move. The highest speed you can use is called your sync speed, but you can also use any longer speed. You can get a lot more information about sync at this link: www.siskinphoto.com/magazine/zpdf/sync.pdf.
Thanks, John Siskin


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3/9/2009 6:43:08 PM

 
Ron Evans
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  Thank you all for taking the time to respond. You have set my mind at ease regarding this being a camera issue.

Unfortunately, I can not do another test run for a few more days because I've been traveling for work. I'll post the results after my next attempt.

Again, I greatly appreciate you all taking the time to respond.

Ron


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3/10/2009 12:44:51 AM

 
K Aune
BetterPhoto Member Since: 4/20/2005
  Hi Ron,
In trying to help myself understand this very thing, I came across this video on youtube which I found to be the clearest explanation that made it 'click' :) for me: here is the link: http://www.youtube.com/watch?v=Xnn5nzPvoIM
if that does not work
type in "digital photography 1 on 1" at youtube.com and it is the first video in the series (it says - Mark explains how the shutter works) I'm sure this will clear things up for you.


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3/10/2009 8:49:07 AM

 
Lynn R. Powers
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  Hi Ron

With the Canon cameras, at least some, when using a non Canon flash attatchment a different setting is needed for the flash. There may even be a different shutter speed for studio lights. READ the manual. On these the only thing you need to adjust is the shutter speed. Probably 1/125 second will do the job. Make sure the camera is set on the proper flash setting also.

Lynn


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3/10/2009 9:45:44 AM

 
John H. Siskin
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4-Week Short Course: An Introduction to Photographic Lighting
  Different camera models, even from the same manufacturer, have different sync speeds. So it is necessary to check what the sync speed for your camera model is. You can find this out in the instructions. You will be able to sync with strobes at any speed longer than the sync speed. Thanks, John Siskin


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3/11/2009 9:32:20 AM

 
Ron Evans
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  Thank you all very much for the feedback. I was able to confirm with an Alien Bees representative that the max shutter speed for my 40d would be 1/250th.

Had I read the manual provided with my camera I would have seen this in the section regarding flash.


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3/11/2009 9:49:48 AM

 
Ron Evans
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Well I finally had about 30 minutes to experiment again today and walked away with a few shots I was very pleased with. The shutter speed was absolutely the culprit although I tested the limits and didn't run into the blackout until 1/500th.

These shots were at 1/200th;f9.


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3/13/2009 6:12:11 PM

 
Ron Evans
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  lighting test 1
lighting test 1
f9;1/200th;studio lighting in my dining room
© Ron Evans
Canon EOS 40D Digi...
 
  lighting test 2
lighting test 2
f9;1/200th;studio lighting in my dining room
© Ron Evans
Canon EOS 40D Digi...
 
 
Well I finally had about 30 minutes to experiment again today and walked away with a few shots I was very pleased with. The shutter speed was absolutely the culprit although I tested the limits and didn't run into the blackout until 1/500th.

These shots were at 1/200th;f9.


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3/13/2009 6:12:51 PM

 
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