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What have I done?
Old 10-27-2007, 04:22 PM   #1 (permalink)
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The model I set everything up for flaked, so me and Pat did some sync speed tests (pat is my non speaking very patient model)

I've included the settings, what am I taking a photo of, my mirror?
photos are portrait with the camera's top to the left.

135.0mm -- f/11.0 -- (1/250)sec -- ISO640
look at the left of the frame



faster shutter moved the line
155.0mm -- f/11.0 -- (1/320)sec -- ISO640


even faster shutter
155.0mm -- f/11.0 -- (1/400)sec -- ISO640


the lights were set on radio slaves
main camera right 3' above 6 feet from the model through an umberella
fill camera left even with and 4 feet from the model through an umbrella
hair snooted shooting from behind and above camera right.
not saying the setup is good, just what I was using.
here is one done "right"
155.0mm -- f/11.0 -- (1/125)sec -- ISO100

Pat is a great help... [grin]
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Re: What have I done?
Old 10-27-2007, 04:33 PM   #2 (permalink)
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It could be the mirror but, normally it would be the shutter starting to close before the flash fired. If you set the shutter faster than the camera can sync to.
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Re: What have I done?
Old 10-27-2007, 04:46 PM   #3 (permalink)
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Just adding to kgphoto's comments, your interesting photos are those that have less than 1/200 seconds of exposure. For many Canons, the sync cutoff is 1/250 seconds. I am not sure what the value is for Nikons. All that is happening is that the shutter was partially closing before the flash had its complete opportunity.

Looking at your first photo, I think your limit is 1/200 second.

Here, view the video on this page...

http://www.studiolighting.net/digita...shutter-speed/
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Last edited by Stecyk; 10-28-2007 at 08:43 AM..
 
Re: What have I done?
Old 10-27-2007, 04:59 PM   #4 (permalink)
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It's the shutter,..not open all the way, (starting to close while the lights are fireing),..your last pic tells the story.
My Canon 20D manual states the sync speed to be 1/250th with canon brand or other brand shoe mounted speed lights,..but for large studio lights 1/125th or slower.
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Re: What have I done?
Old 10-27-2007, 05:38 PM   #5 (permalink)
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As a general rule you usually want to set the shutter speed of any dSLR camera to 1 stop lower than the published sync speed. This is especially true for studio strobes. In so doing, one will avoid the black stripes of the shutter curtains blocking part of the scene.
Cheers,
rfs
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Re: What have I done?
Old 10-27-2007, 07:12 PM   #6 (permalink)
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For most consumer Canons, the sync is 1/200 or slower. With my 30D, I've never seen the shutter at 1/200. Now that I have a 40D, I'll have to see if 1/250 is as reliable.

A tech note...you're seeing the shutter move horizontally because you tilted the camera. It moves across the shoter side of the sensor because it has less distance to travel that way. Newer models use a software first curtain. Ultimately, 2 software curtains will make syncs faster and eliminate mechanical failure of the shutter.
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Re: What have I done?
Old 10-27-2007, 07:43 PM   #7 (permalink)
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Also, just because I had to do it...I'm glad I'm not the only one that uses a mannequin. I was testing my 40D on "M" just last night!

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Re: What have I done?
Old 10-28-2007, 01:24 AM   #8 (permalink)
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Quote:
Originally Posted by PhotosbyChuck View Post
Also, just because I had to do it...I'm glad I'm not the only one that uses a mannequin. I was testing my 40D on "M" just last night!
Wow, you're "personal model" has shoulders... I'm envious..

Thanks everyone, I believe the D200 sync speed is 1/250
With a real person, I always use 1/125 or slower and lower the ISO if need be.

This line goes from top to bottom following the shortest path across the sensor. Is it the mirror or the sensor or "the shutter"
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Re: What have I done?
Old 10-28-2007, 01:41 AM   #9 (permalink)
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Quote:
Originally Posted by BobEdens View Post
This line goes from top to bottom following the shortest path across the sensor. Is it the mirror or the sensor or "the shutter"
Are you talking about a line other than what you you showed in your post above? If so, do you have any examples? The posts above are definitely examples of taking a picture of the inside of your shutter curtain.

Keep in mind that at shutter speeds above the camera's sync speed, there is no time during the exposure during which the entire frame is uncovered by the shutter. Exposure is made by what is essentially a slit that travels across the frame. The width of the slit narrows as the shutter speed decreases. Your shots here are a practical demonstration of this.
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Re: What have I done?
Old 10-28-2007, 07:13 AM   #10 (permalink)
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Quote:
Originally Posted by BobEdens View Post
This line goes from top to bottom following the shortest path across the sensor. Is it the mirror or the sensor or "the shutter"
It is definitely the shutter.
You may have been confused by the video linked to in Stecyks post.
On older cameras the shutter curtains often moved across the longer edge of the film (as shown in the video), but most modern cameras have the shutter curtains travelling vertically. The shorter travel distance allows for faster flash synchronisation speeds, because each curtain can cromplete it's travel in a shorter time.

You just need to keep your shutter speed at 1/200 or slower.
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