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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 20 Jan 2011 (Thursday) 21:41
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Effective Range on 580EXII. NEED HELP!

 
icarus57
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Jan 20, 2011 21:41 |  #1

Hello Everyone,

Ok, so I'm one of those that dont read the manual before using the product, but I wanted to know what the hell is effective range on Manual mode. When i dial my lens the flash's effective range changes also. What does this all mean lol. Thank you in advance for all your help.




  
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PacAce
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Jan 20, 2011 21:50 |  #2

The distance scale at the back of the flash gives you the effective range of the flash (minimum distance and maximum distance) at a given ISO and aperture selected on the camera for a "typical" subject that's mid-gray in tone in a "typical" shooting environment (which usually means there are wall to bounce back some of the stray light towards the subject). Of course, there's the usual disclaimer that you actual mileage will vary. :)

BTW, you'll get an effective distance range when shooting in E-TTL mode. When shooting in Manual mode, you only get an effective distance, not a range of distance. And in both cases, it is assumed that the flash head is pointed forward towards the subject.


...Leo

  
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icarus57
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Jan 20, 2011 22:01 |  #3

PacAce wrote in post #11682662 (external link)
The distance scale at the back of the flash gives you the effective range of the flash (minimum distance and maximum distance) at a given ISO and aperture selected on the camera for a "typical" subject that's mid-gray in tone in a "typical" shooting environment (which usually means there are wall to bounce back some of the stray light towards the subject). Of course, there's the usual disclaimer that you actual mileage will vary. :)

BTW, you'll get an effective distance range when shooting in E-TTL mode. When shooting in Manual mode, you only get an effective distance, not a range of distance. And in both cases, it is assumed that the flash head is pointed forward towards the subject.

How bout when you are using a trigger system, like a pocket wizard and must use it on manual mode? so if its on 24mm, does that mean the effective range of the flash is shorter or farther?




  
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PacAce
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Jan 20, 2011 22:14 |  #4

icarus57 wrote in post #11682738 (external link)
How bout when you are using a trigger system, like a pocket wizard and must use it on manual mode? so if its on 24mm, does that mean the effective range of the flash is shorter or farther?

In order for the distance scale to work, the flash must be mounted on the camera or connected via an off-shoe cord. However, even if the distance scale is not shown, the principle still applied. The effective distance is determined by applying what's referred to as the guide number (GN) of the flash at a specific head zoom position at ISO 100 (the GN is listed at the back of your flash manual).

But the general rule is that the smaller the focal length the head is zoomed to, the smaller your effective distance will be for a given aperture and ISO. This is because at a smaller focal length, the flash light is spread out more so there's less of it to light up the subject. Conversely, if you increase focal length so that the flash light is concentrated into a narrower beam, there's more light falling on the subject so that increases the effective distance of the flash for the same camera setting.


...Leo

  
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dmward
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Jan 20, 2011 22:23 |  #5

The range indicator on the flash is flash to subject. Which is what matters. So its still valid if the flash is off camera.

The zoom changes effective range because is widens the coverage area for the light. Thus less light for a specific spot in the coverage area.


David | Sharing my Insights, Knowledge & Experience (external link) | dmwfotos website (external link)

  
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PacAce
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Jan 20, 2011 22:34 |  #6

dmward wrote in post #11682850 (external link)
The range indicator on the flash is flash to subject. Which is what matters. So its still valid if the flash is off camera.

The zoom changes effective range because is widens the coverage area for the light. Thus less light for a specific spot in the coverage area.

Yes, it would be valid but for the fact that no distance range will be displayed if the flash is off camera. ;)
(The flash needs to get the ISO and aperture values from the camera in order to determine the effective distance (for manual) or distance range (for E-TTL)).


...Leo

  
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dmward
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Jan 20, 2011 23:11 |  #7

Good point Leo.
Obviously I have been using my FlexTT5s too much to control off camera speedlites. :-)


David | Sharing my Insights, Knowledge & Experience (external link) | dmwfotos website (external link)

  
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PacAce
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Jan 20, 2011 23:20 |  #8

dmward wrote in post #11683066 (external link)
Good point Leo.
Obviously I have been using my FlexTT5s too much to control off camera speedlites. :-)

Admit it, David. You're just too spoiled. ;) :D


...Leo

  
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Effective Range on 580EXII. NEED HELP!
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