Question about flash speeds

12 years 9 months ago #118201 by Happy Hour
Just out of curiosity let's say a flash like SB800 or SB700, how quick can they freeze the action? I know it's fast, but how fast? 1/4000 second? Faster or slower?

With high speed photography, did I understand this right, you can set your camera's shutter to just about anything you want, because it's the flashes speed that is going to make all the difference?


Photo Comments
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12 years 9 months ago #118210 by cod

Happy Hour wrote: With high speed photography, did I understand this right, you can set your camera's shutter to just about anything you want, because it's the flashes speed that is going to make all the difference?


Shutter speed selection on the camera doesn't affect how much light the flash puts outs. TTL flash exposure is determined based on the aperture and ISO selected. So, theoretically, you can select any flash speed you want. Photographers use this fact to balance flash and ambient light and avoid black backgrounds when the main subject is primarily lit by flash. However, because of the way the camera shutter works there is a maximum shutter speed at which flash can be used It varies from camera to camera but is typically around 1/250th of a second. A normal flash shot at a higher shutter speed will just show a black band across part of the image where the camera shutter was partially closed.

Some cameras have a special high speed sync mode, but this uses electronic trickery and severely limits the flash's light output.

The actual flash light output time is, as you said , much faster than the maximum sync speed, though I don't know the numbers. High speed photography with normal flashes (at full power) is possible but requires a different technique, either special shutter arrangements or shooting in the dark, keeping the shutter open and then firing the flash as the only light source.

Chris O'Donoghue
Winnipeg, Canada
codonoghue.prosite.com

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12 years 9 months ago #118211 by Henry Peach
Typical speedlight flash duration is 1/1000th of a sec or less.

Most cameras have a flash sync speed that is the fastest shutter speed you can use with a regular flash. The sync speed is the highest shutter speed where the shutter is all the way open. Faster shutter speeds on focal plane shutter cameras are simulated by only opening a portion of the shutter. If you fire a normal flash at these higher speeds you will only flash the portion of the scene where the shutter is open when the flash goes off.

Some flashes do have a high speed sync feature that causes the flash duration to be longer so shutter speeds than the sync speed can be used. I don't think this would work well for high speed photography.
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12 years 9 months ago #118250 by Jim Photo
:agree: Good information and good thread topic


Photo Comments
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12 years 9 months ago #118304 by Screamin Scott
IIRC a flash that has variable power settings (full, half, quarter...etc) adjusts the flash duration depending on the power level selected...

Scott Ditzel Photography

www.flickr.com/photos/screaminscott/

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12 years 9 months ago - 12 years 9 months ago #118398 by MLKstudios
In Manual mode typically 1/500 (Full) to 1/50,000 (1/128 power). In TTL mode (large ap used close in) even shorter.

Matthew

Matthew L Kees
MLK Studios Photography School
www.MLKstudios.com
[email protected]
"Every artist, was once an amateur"

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12 years 9 months ago #118446 by Happy Hour
I wake up and look at all the good information for me. Thank you for taking the time on my question 1/50000 is pretty fast!


Photo Comments
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12 years 9 months ago #118449 by Henry Peach
This guy measured his Canon 580ex flash duration

www.photosbykev.com/wordpress/2008/07/12...80ex-flash-duration/

I guess my previous post is ancient info, and not accurate with today's flashes.
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12 years 9 months ago - 12 years 9 months ago #118452 by MLKstudios
These are Nikon's specs for the SB-900 in Manual mode:

1/880 sec. at M 1/1 (full) output
1/1100 sec. at M 1/2 output
1/2550 sec. at M 1/4 output
1/5000 sec. at M 1/8 output
1/10000 sec. at M 1/16 output
1/20000 sec. at M 1/32 output
1/35700 sec. at M 1/64 output
1/38500 sec. at M 1/128 output

... and their new SB-700:

1/1042 sec. at M1/1 (full) output
1/1136 sec. at M1/2 output
1/2857 sec. at M1/4 output
1/5714 sec. at M1/8 output
1/10000 sec. at M1/16 output
1/18182 sec. at M1/32 output
1/25000 sec. at M1/64 output
1/40000 sec. at M1/128 output

When you shoot in TTL mode, the power can be lowered beyond 1/128 (i.e. quicker).

Thanks to Harold "Doc" Edgerton who showed us how to "stop time". :)

Matthew L Kees
MLK Studios Photography School
www.MLKstudios.com
[email protected]
"Every artist, was once an amateur"

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