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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 05 Jan 2012 (Thursday) 02:33
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Trigger Slaves with Diffuser

 
MrGreen
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Jan 05, 2012 02:33 |  #1

Hi there,

New to using flashes and I have a quick question. I have a 580 EX II and I am about to get a 430 EX II as a second unit.

Can I trigger the 430 EX II in slave mode if I put a diffuser, like a Sto-fen, on the 580 EX II acting as a master?

Thanks.


My site: www.millionflame.com (external link)
Gear: 7D - Zeikos Grip, Rebel XTi/400D - Opteka Grip, EF 24-105mm f/4L, EF 100mm f/2.8L MACRO, EF 50mm f/1.8 (Nifty Fifty), EF-s 55-250mm (Nifty Two-Fifty), Tokina 11-16mm f/2.8, Σ 150-500mm (Bigmos), Σ 35mm f/1.4, Σ 85mm f/1.4, Feisol CT-3442 CF Tripod, Photo Clam PC-40NS Ball head, 580 EX II Flash

  
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GeeMack
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Jan 05, 2012 07:40 |  #2

Yes. I highly recommend you take a look at this thread.
https://photography-on-the.net …/showthread.php​?t=1131904


7D, 50 f1.8, 17-55 f2.8, 70-200 f2.8 II, 100-400 f4.5-5.6L, 2x TC III, 580EX II, 430EX, 568EX II, 622C
glmphotos.zenfolio.com (external link)

  
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MrGreen
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Jan 05, 2012 14:03 |  #3

GeeMack wrote in post #13650302 (external link)
Yes. I highly recommend you take a look at this thread.
https://photography-on-the.net …/showthread.php​?t=1131904

Thank you, I saw this the other day. Appreciate the help. :)


My site: www.millionflame.com (external link)
Gear: 7D - Zeikos Grip, Rebel XTi/400D - Opteka Grip, EF 24-105mm f/4L, EF 100mm f/2.8L MACRO, EF 50mm f/1.8 (Nifty Fifty), EF-s 55-250mm (Nifty Two-Fifty), Tokina 11-16mm f/2.8, Σ 150-500mm (Bigmos), Σ 35mm f/1.4, Σ 85mm f/1.4, Feisol CT-3442 CF Tripod, Photo Clam PC-40NS Ball head, 580 EX II Flash

  
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dedsen
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Jan 05, 2012 14:13 |  #4

As long as the sensor on the front of the 430 can see the light from the 580 flash it will trigger.
The whole other discussion is why you think you need a Stofen?



  
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MrGreen
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Jan 05, 2012 14:58 |  #5

dedsen wrote in post #13652309 (external link)
As long as the sensor on the front of the 430 can see the light from the 580 flash it will trigger.
The whole other discussion is why you think you need a Stofen?

Just to take away the harsh light from the 580 EX II. I'll use the 580 as my key, and the 430 as my fill.


My site: www.millionflame.com (external link)
Gear: 7D - Zeikos Grip, Rebel XTi/400D - Opteka Grip, EF 24-105mm f/4L, EF 100mm f/2.8L MACRO, EF 50mm f/1.8 (Nifty Fifty), EF-s 55-250mm (Nifty Two-Fifty), Tokina 11-16mm f/2.8, Σ 150-500mm (Bigmos), Σ 35mm f/1.4, Σ 85mm f/1.4, Feisol CT-3442 CF Tripod, Photo Clam PC-40NS Ball head, 580 EX II Flash

  
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SkipD
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Jan 05, 2012 20:28 |  #6

MrGreen wrote in post #13652557 (external link)
Just to take away the harsh light from the 580 EX II.

Do you realize that the small 'tupperware' diffusers do NOT "take away harsh light" unless you have significant (preferably white) reflective surfaces such as walls and ceiling nearby to return the light toward the subject? All these diffusers do is scatter light in many directions instead of toward the subject. Without the reflective surfaces, all one accomplished by using one of these diffusers is reducing the available light from the flash and wasting battery power.

The only thing that "softens" light from a source of light is making the apparent size of the source significantly larger. With the large reflective surfaces, the reflective surfaces become the effective source of the light and they are much larger than the flash lens itself. Without the surfaces, the Stofen's size is not significantly larger than the flash lens itself and the result is very little softening of the shadows near the subject.

Using the Stofen diffuser in an optical master/slave setup would reduce the reliability of the slave to properly "see" the master.


Skip Douglas
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..... but still learning all the time.

  
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MrGreen
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Jan 06, 2012 01:13 |  #7

SkipD wrote in post #13654258 (external link)
Do you realize that the small 'tupperware' diffusers do NOT "take away harsh light" unless you have significant (preferably white) reflective surfaces such as walls and ceiling nearby to return the light toward the subject? All these diffusers do is scatter light in many directions instead of toward the subject. Without the reflective surfaces, all one accomplished by using one of these diffusers is reducing the available light from the flash and wasting battery power.

The only thing that "softens" light from a source of light is making the apparent size of the source significantly larger. With the large reflective surfaces, the reflective surfaces become the effective source of the light and they are much larger than the flash lens itself. Without the surfaces, the Stofen's size is not significantly larger than the flash lens itself and the result is very little softening of the shadows near the subject.

Using the Stofen diffuser in an optical master/slave setup would reduce the reliability of the slave to properly "see" the master.

Cool, thanks for the info. How do I then diffuse the master key light but still have it trigger the slave unit? Can I put it in a softbox?


My site: www.millionflame.com (external link)
Gear: 7D - Zeikos Grip, Rebel XTi/400D - Opteka Grip, EF 24-105mm f/4L, EF 100mm f/2.8L MACRO, EF 50mm f/1.8 (Nifty Fifty), EF-s 55-250mm (Nifty Two-Fifty), Tokina 11-16mm f/2.8, Σ 150-500mm (Bigmos), Σ 35mm f/1.4, Σ 85mm f/1.4, Feisol CT-3442 CF Tripod, Photo Clam PC-40NS Ball head, 580 EX II Flash

  
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SkipD
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Jan 06, 2012 06:10 |  #8

MrGreen wrote in post #13655542 (external link)
Cool, thanks for the info. How do I then diffuse the master key light but still have it trigger the slave unit? Can I put it in a softbox?

You could use a softbox or the largest practical reflector panel mounted with the flash (either on-camera or off-camera, depending on what's possible for the situation). The idea is to radically increase the area of the light source (as "seen" by the subject).


Skip Douglas
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..... but still learning all the time.

  
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Trigger Slaves with Diffuser
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