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Old May 8, 2010, 2:09 AM   #1
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Default Using a flash/ need faster shutter speed

Hi all,

I am trying to find a way to get my shutter speed down to 1/400 of a sec when using and external flash with a canon dslr. I seem to get stuck at 1/200. And I actually got put into a situation at 1/200 was still to slow with the flash.

Will the HSS feature allow me to use a faster shutter speed then the 1/200 that the camera is limited to when using an external flash?
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Old May 8, 2010, 3:14 AM   #2
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PS,

Also I need the flash to keep up in burst mode, is that asking way to much form any flash?
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Old May 8, 2010, 3:16 AM   #3
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You will need to use external flash for getting over 1/200s and with HSS. The downside of this is that you get a reduced power than if you are at 1/200 or slower. What are you trying to shoot that is creating the need for this?
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Old May 8, 2010, 3:17 AM   #4
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night time swing dancing without any light sources besides the flash.
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Old May 8, 2010, 3:21 AM   #5
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This was what I was trying to shoot, at any distance over 20 feet, since there was really nothing to bounce light back or give any really ambient light. The flashes power was not strong enough.

http://forums.steves-digicams.com/pe...promenade.html
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Old May 8, 2010, 3:28 AM   #6
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Easy, unless you are trying to get ambient light in which case you will get some blur (although if done right can look cool). Just set a manual exposure that is about 2-3 stops below ambient and then use the flash to expose the subjects. The flash pulse is incredibly fast so even if they are going very quickly you will be fine. Lets say that to get 2 stops under ambient you need to be using 1/30s, f5.6 and ISO 1600, without flash you will get a little background and then a silhouetted subject. Turn the flash on, you might need a little flash power compensation depending on how the camera/flash reads to get it accurate and shoot away.

I did some explanation for another user a while ago in this thread http://forums.steves-digicams.com/pa...or-photos.html sorry for the terrible photos of me, I have no one else to shoot!
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Old May 8, 2010, 3:31 AM   #7
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The problem was there was really no ambient lighting, never shot this dark before.
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Last edited by shoturtle; May 8, 2010 at 3:37 AM.
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Old May 8, 2010, 3:37 AM   #8
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OK, just saw your other post but I had already started writing mine so didn't bring that into consideration. So, yep, reducing the ambient will be a winner here, or there is no major problem with using HSS (you can sometimes get a very slight ghosting due to the multiple flash pulses needed to cover the whole exposure).
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Old May 8, 2010, 3:40 AM   #9
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Thanks Mark,

I really need to read up more on flash photography. Any suggestion on what I should look up. So the next time I am shooting in such a no light enviroment, I can compensate for it?
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Last edited by shoturtle; May 8, 2010 at 3:44 AM.
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Old May 8, 2010, 3:48 AM   #10
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Quote:
Originally Posted by shoturtle View Post
The problem was there was really no ambient lighting, never shot this dark before.
That's not a problem, just under expose more but shooting manual settings then the flash is working only on your subject as per the link I sent. For freezing with flash and a 'slow' shutter speed the lack of light is actually your friend.

Also looking at the link you posted, quite a few look fine, but some are not focused on the subject.

Quote:
Originally Posted by shoturtle View Post
Thanks Marc,

I really need to read up more on flash photography. Any suggestion on what I should look up. So the next time I am shooting in such a no light enviroment, I can compensate for it?
Honestly I've no idea, I've learnt everything through trial and error, different forums and working with different photographers who have been kind enough to share insight on their technique.

Basic rule if you are not worried about the background too much. Set an manual exposure without flash that is giving 2-3 stops under exposed then bring in the flash and use that for lighting the subject. It doesn't matter if the shutter speed you need is 1/25s or 1/200, it is allowing the flash pulse (potentially 1/10,000s) to do the work in freezing action when it fires and exposes your subjects correctly.

Again, this is covered in my post in the thread http://forums.steves-digicams.com/pa...or-photos.html
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