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FORUMS Photography Talk by Genre Macro Talk
Thread started 06 Oct 2010 (Wednesday) 18:48
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shutter speed for Macro

 
alann
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Oct 06, 2010 18:48 |  #1

I have always used a 1/ 250 shutter speed for macro photography with my flash. As I read the forums I see that some people are using high sync flash in order to get 1/1000 and higher speeds. Is there any real advantage been doing this?


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TuanTime
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Oct 06, 2010 19:09 |  #2

I would assume that the higher shutter speeds will help with moving subjects.




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Wallpap3r
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Oct 06, 2010 20:42 |  #3

And specular highlights. Learned my lesson about speculars today (really bad ghosty blur :()
You would lose recycling time though, not sure how much. It could also help kill ambient if a certain scene you want total control of without shading the subject


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LordV
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Oct 07, 2010 02:48 |  #4

The only advantage of using high speed sync flash that I've come across in normal macro shooting is where you want significant flash contribution where there is a very high level of ambient light. IE it enables you to use high shutter speeds to cut down the light. It could also be used where you are shooting fill flash (ie in Av or Tv modes) and want high shutter speed to stop motion blur in the natural light but also want some fill flash in a backlit subject.
In general using high speed sync flash does not in fact give faster effective shutter speeds for motion stopping unless it is used at very high shutter speeds (eg above 1/2000th sec) for full flash shots.
This might sound counter-intuitive but in cases where flash is used for motion stopping capability (a lot of macro) using normal sync flash at say 1/200th or 1/250th gives one pulse of flash with a likely duration faster than 1/1000th sec and this is the effective shutter speed. Using high speed sync flash at say 1/1000th sec shutter speed actually causes the flash to strobe in time with the shutter motion so you get a total flash duration of exactly 1/1000th sec made up of small pulses. This is likely to be actually a slower pulse time than the single flash.

Brian v.


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TuanTime
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Oct 07, 2010 09:34 |  #5

LordV wrote in post #11050329external link
The only advantage of using high speed sync flash that I've come across in normal macro shooting is where you want significant flash contribution where there is a very high level of ambient light. IE it enables you to use high shutter speeds to cut down the light. It could also be used where you are shooting fill flash (ie in Av or Tv modes) and want high shutter speed to stop motion blur in the natural light but also want some fill flash in a backlit subject.
In general using high speed sync flash does not in fact give faster effective shutter speeds for motion stopping unless it is used at very high shutter speeds (eg above 1/2000th sec) for full flash shots.
This might sound counter-intuitive but in cases where flash is used for motion stopping capability (a lot of macro) using normal sync flash at say 1/200th or 1/250th gives one pulse of flash with a likely duration faster than 1/1000th sec and this is the effective shutter speed. Using high speed sync flash at say 1/1000th sec shutter speed actually causes the flash to strobe in time with the shutter motion so you get a total flash duration of exactly 1/1000th sec made up of small pulses. This is likely to be actually a slower pulse time than the single flash.

Brian v.


This makes a lot more sense, I didn't think my response through that well and I stand corrected. :)




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alann
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Oct 07, 2010 13:07 |  #6

Thank you so much for the information


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shutter speed for Macro
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