Jump to content


Photo
- - - - -

Dual strobe ratios


  • Please log in to reply
2 replies to this topic

#1 SteveB

SteveB

    Clownfish

  • Member
  • Pip
  • 22 posts

Posted 27 September 2012 - 10:06 PM

Being a beginner, I suspect that I may be barking up the wrong tree, but I'll ask anyway.
I have a 50D in Ike housing and two DS-125's. The manual says to put the strobes on TTL and then select between manual and TTL on the housing and adjust the power there as well. Fair enough. That seems the most versatile option.

Assuming fully manual operation, can I get one strobe to fire at half or quarter power of the other ? If I put one strobe on full power (at the strobe) and the other on 1/2, will they maintain that ratio if I set the power on the housing to say -1 (giving me one at 1/2 and one at 1/4) ?
Does it work that way ? If so, does it matter which strobe has which power ?

I appreciate that I can put the strobes at different distances and/or have one without a diffuser. I'm just trying to get a feel for what options I have available.

Thanks,

Steve.

#2 Balrog

Balrog

    Eagle Ray

  • Member
  • PipPipPip
  • 346 posts
  • Gender:Male
  • Location:Poole UK

Posted 28 September 2012 - 09:41 AM

The Ike housing controls only work with the strobe knobs set to TTL from where, as you correctly say, you can set either manual or TTL. As soon as you set the strobe knobs to anything other than TTL you will get exactly what you have asked the strobes to do irrispective of anything you might select on the housing.

As you say, the housing control will set both the same. If you want a shot where the strobe intensity differs from side to side then you need to go manual on the strobes or for close work pull one further away from your subject.

#3 Cerianthus

Cerianthus

    Tiger Shark

  • Member
  • PipPipPipPip
  • 655 posts
  • Gender:Male
  • Location:Hasselt, Overijssel, Netherlands

Posted 28 September 2012 - 12:38 PM

if you want the most control, you will need to shoot both manual, if the idea is a general grading in intensity, you could also put a diffusor on one or place one strobe further back.
Gerard

My photo's on flickr
Crop the world ! (Using Canon 20D, 60mm, 100mm, 10-17mm FE, Ikelite)