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Canon 30D - how to set rear sync
Old 04-28-2007, 01:49 PM   #1 (permalink)
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I'm trying to show a friend of mine how to drag his shutter on his Canon 30d. Does anyone know how to set the 30D to rear sync?
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Re: Canon 30D - how to set rear sync
Old 04-28-2007, 02:18 PM   #2 (permalink)
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Originally Posted by Photomart View Post
I'm trying to show a friend of mine how to drag his shutter on his Canon 30d. Does anyone know how to set the 30D to rear sync?
Custom Function 15 sets Rear Sync (but its for use with flash). Here is a link to an online guide for the 30D

http://www.kenrockwell.com/canon/30d/users-guide.htm

Cheers,
rfs
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Re: Canon 30D - how to set rear sync
Old 04-28-2007, 03:08 PM   #3 (permalink)
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Thanks -- I knew you would be able to help. In fact, I tried to call you while my friend was at my studio but I don't have your number. When you get a chance, please email it to me.

thanks
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Re: Canon 30D - how to set rear sync
Old 04-28-2007, 06:15 PM   #4 (permalink)
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What the heck is rear sync? What the heck is draggin the shutter? Boy do I have a lot to learn!
 
 
Re: Canon 30D - how to set rear sync
Old 04-28-2007, 06:22 PM   #5 (permalink)
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What the heck is rear sync? What the heck is draggin the shutter? Boy do I have a lot to learn!
Draggin the shutter means that you have the shutter open longer than is necessary for the flash in order to grab the ambient/background light.

If you were to use a camera mounted flash and take a picture of someone outside at night without dragging the shutter, the person would be brightly lit, but the background would be black. If you drag the shutter (keep the shutter open a bit longer), some of the ambient light registers on the image so now you can see the person as well as the surroundings.

Rear Sync. The default mode for camera flashes is to flash when the shutter opens. You might not want to do that. Say, for example, you are in the tropics at night taking a shot of a person walking with a torch. Here you want to drag the shutter to get some of the background. If you were to use the flash in its default mode, the torch and person will register immediately, and then you will see the torch continue to move forward as if some ghost were carrying it. In other words, a torch trail will be left AHEAD of the person.

If you use rear sync, then the flash will send a burst of light just prior to the shutter closing. Now, that same image of the person with the torch will look differently. You will see the torch trail BEHIND the person, and then the person and torch will be brightly lit.

Hope that helps.
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Re: Canon 30D - how to set rear sync
Old 04-28-2007, 07:04 PM   #6 (permalink)
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To expand just a bit on the "shutter dragging" that Stecyk covered in his post, I would mention that you can precisely determine the amount to "drag the shutter" using a good meter. Essentially you meter the flash on the main subject which gives you the fstop needed. Normally if you were unconcerned about how ambient light might effect the shot, you'd just leave the camera in at its sync speed (usually 1/60th to 1/250th depending on camera). But if you need to include the ambient light you just meter the area lit by the ambient light using the meter set to the fstop already determined for the flash. So it will return the exact shutter speed at that fstop for the best shutter speed to expose the ambient lit area properly.

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Re: Canon 30D - how to set rear sync
Old 04-28-2007, 09:11 PM   #7 (permalink)
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Quote:
Originally Posted by Bigtimebeginner View Post
What the heck is rear sync? What the heck is draggin the shutter? Boy do I have a lot to learn!
Rolando has a two page article under photo tips about dragging the shutter with with examples at different exposures. Here's the link.
http://www.glamour1.com/forums/view....=sunset_beauty
Ken
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Re: Canon 30D - how to set rear sync
Old 05-03-2007, 02:13 AM   #8 (permalink)
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I never could figure why the rear sync wasn't the default or why camera manufacturers don't just do away with front sync. Light trails ahead of the subject just seem 'odd'...not natural (try taking a burning branch out of the campfire and wave it around...you'll see streaking behind it, never in front).

When would you want 'front sync'?
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Re: Canon 30D - how to set rear sync
Old 05-06-2007, 09:28 PM   #9 (permalink)
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Sometimes you don't want second curtain sync. By definition, second curtain (or dragging) lets some ambient light onto the film/sensor. It could be that there is considerable ambient light falling on the model but not enough to ensure a decent shutter speed to avoid camera shake so you opt to use flash. With 1st curtain(no dragging) the ambient light will have negligable effect on the model but will probably some background detail to a degree. Not a bad effect especially if you can hand hold at a slower shutter speed.
With 2nd curtain it is possible that the lens is open so long that the ambient light falling on the model will begin to register an image on the film before and in addition to the flash exposure which follows. What you then get is a strange effect where the subject is both blurred (camera shake) and sharp at the same time.
I have an Olympus Evolt and it has three shutter modes.
1. 1st curtain with a higher shutter speed (results in black background)
2. 1st curtain with a slow shutter speed (allows some of ambient light to register.
3. 2nd curtain with a longer 2 second exposure( deliberately creates the trailing light behind the subject)

Hope this helps

Paul
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Re: Canon 30D - how to set rear sync
Old 05-10-2007, 02:57 AM   #10 (permalink)
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Thanks...I'll have to read this a few times to get my head around it. I've had shots with the 2nd curtain and I know what you mean about blurry/in focus. I'll have to try to remember this.
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