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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 06 Apr 2018 (Friday) 03:57
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When to use HSS

 
dpe
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Post edited 3 months ago by dpe. (2 edits in all)
     
Apr 06, 2018 03:57 |  #1

Was trying to explain a rationale for using or not using HSS to some people I was demonstrating to, so put it into a flow diagram


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Sibil
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Apr 06, 2018 04:45 |  #2

dpe wrote in post #18601132 (external link)
Was trying to explain a rationale for using or not using HSS to some people I was demonstrating to, so put it into a flow diagram
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Nice




  
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nixland
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Apr 06, 2018 05:43 |  #3

dpe wrote in post #18601132 (external link)
Was trying to explain a rationale for using or not using HSS to some people I was demonstrating to, so put it into a flow diagram
thumbnail
Hosted photo: posted by dpe in
./showthread.php?p=186​01132&i=i191205434
forum: Flash and Studio Lighting


To freeze action, if we don't need to capture ambient light (for example in studio), using normal non hss mode might be preferable, right? :)




  
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dpe
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Apr 06, 2018 05:46 |  #4

nixland wrote in post #18601161 (external link)
To freeze action, if we don't need to capture ambient light (for example in studio), using normal non hss mode might be preferable, right? :)

It all depends on the flash and the power you are using it at, as an example the Godox AD600 at full power has a t0.1 of /210 which will not freeze most action, so no simple answer

Mike


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John ­ from ­ PA
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Apr 06, 2018 08:05 |  #5

Sibil wrote in post #18601143 (external link)
Nice

Ditto. I think I will shrink it to a small card, laminate it and keep a copy with my gear.




  
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John ­ from ­ PA
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Apr 06, 2018 08:06 |  #6

nixland wrote in post #18601161 (external link)
To freeze action, if we don't need to capture ambient light (for example in studio), using normal non hss mode might be preferable, right? :)

Just how much action is "in studio"?




  
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nixland
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Post edited 3 months ago by nixland.
     
Apr 06, 2018 08:46 |  #7

John from PA wrote in post #18601208 (external link)
nixland wrote in post #18601161 (external link)
To freeze action, if we don't need to capture ambient light (for example in studio), using normal non hss mode might be preferable, right? :)

Just how much action is "in studio"?

Martial arts/sport in action, ballet dancing, flowing hair, water drops, etc.




  
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nixland
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Apr 06, 2018 08:49 |  #8

dpe wrote in post #18601163 (external link)
It all depends on the flash and the power you are using it at, as an example the Godox AD600 at full power has a t0.1 of /210 which will not freeze most action, so no simple answer

Mike

In studio we can use less power.

Even if we use hss, it gives less power too right? :)




  
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dpe
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Post edited 3 months ago by dpe.
     
Apr 06, 2018 09:38 |  #9

nixland wrote in post #18601229 (external link)
In studio we can use less power.

Even if we use hss, it gives less power too right? :)

Maybe, maybe not but what I was explaining was for use outdoors


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Tom ­ Reichner
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Apr 06, 2018 09:45 |  #10

.

What about times we need to freeze action, but can do it with shutter speed, not flash? . But we want the flash to overcome the shadows? . Such as when I can use shutter speed alone to freeze action because 1/400th is plenty fast enough to freeze a running deer ....... but I want to use the flash for shadow control. . Is this type of situation covered in the chart?


.


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dpe
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Apr 06, 2018 09:50 |  #11

Tom Reichner wrote in post #18601252 (external link)
.

What about times we need to freeze action, but can do it with shutter speed, not flash? . But we want the flash to overcome the shadows? . Such as when I can use shutter speed alone to freeze action because 1/400th is plenty fast enough to freeze a running deer ....... but I want to use the flash for shadow control. . Is this type of situation covered in the chart?


.

Explicitly no but implicitly would come under the freeze action, yes path

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Sibil
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Apr 06, 2018 09:54 |  #12

John from PA wrote in post #18601207 (external link)
Ditto. I think I will shrink it to a small card, laminate it and keep a copy with my gear.

Good idea. I have never used HSS flash, and this should be useful to get started. I am thinking bird photography with bright sky backgrounds.




  
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dpe
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Apr 06, 2018 10:07 |  #13

Sibil wrote in post #18601256 (external link)
Good idea. I have never used HSS flash, and this should be useful to get started. I am thinking bird photography with bright sky backgrounds.


Just remember the inverse square law and the fact that there is an initial drop in power when moving into HSS

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Sibil
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Apr 06, 2018 11:10 |  #14

dpe wrote in post #18601265 (external link)
Just remember the inverse square law and the fact that there is an initial drop in power when moving into HSS

Mike

Got it. Thanks.




  
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Wilt
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Post edited 3 months ago by Wilt. (2 edits in all)
     
Apr 06, 2018 13:33 |  #15

dpe wrote in post #18601265 (external link)
Just remember the inverse square law and the fact that there is an initial drop in power when moving into HSS

Mike

Typically flash units lose at least -2EV in power when shifting into HSS light output, meaning that you have to use 2EV faster aperture, or your flash distance is cut in half.
AND THEN, for every 1EV faster shutter speed, the reach of the flash is cut by another -1EV, so you could lose a total of (at least) -6EV if needed to shoot at 1/5120 instead of 1/200 (for a FF dSLR) -- or about 1/8 of the usual distance achievable at any particular f/stop.

Some flashes start with losing -3EV, or the flash distance is cut to 1/3 its usual distance! AND THEN, for every 1EV faster shutter speed, the reach of the flash is cut by another -1EV,


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When to use HSS
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