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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 11 Dec 2013 (Wednesday) 06:46
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Elinchrom Low Power Output

 
wizard13
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Dec 11, 2013 06:46 |  #1

For those of you that use Elinchrom strobes-
How do you achieve large apertures (f2.8 and larger) while using the strobes? Are you using ND filters on the camera? I have two BXR500's and looking to add another strobe but even the BRX250 only stops down to 16ws. Any suggestions?
Thanks!


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Dec 11, 2013 08:09 |  #2

ND gels, skrims, ND filters.


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wizard13
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Dec 11, 2013 08:16 |  #3

windpig wrote in post #16518437 (external link)
ND gels, skrims, ND filters.

Thanks. Just wasn't sure if there was an option I was missing. Like a strobe that had a lower output from elinchrom than the 16ws for the BXR250. I know the Einstein goes down to 2.5 so was curious.


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Dec 11, 2013 09:04 |  #4

Grid


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Dec 11, 2013 09:51 |  #5

abbadon31 wrote in post #16518579 (external link)
Grid

A grid will also alter the quality of the light so it's not always an option.


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Dec 11, 2013 10:15 |  #6

Increased distance from light to subject.
Also alters light quality, of course.


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wizard13
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Dec 11, 2013 10:21 |  #7

Distance can always be used but then the effect of a larger softbox is negated. So it seems that ND gels/filters are the way to go since Elinchrom does not have a low output (2.5ws / 5ws) strobe? Any other options to obtain a f2.8 or wider?
Thanks for all the replies!


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Dec 11, 2013 11:20 |  #8

I looked up the BRX250 on Elinchrom web site, but unfortunately they do not list any expected f/stop at any power levels. But we can start with BRX500 has minimum 32 w-s setting, while BRX250 has minimum 16w-s setting.

So I went to Paul Buff web site to get comparable outputs. Buff says at 5' from subject

  • 40 w-s should result in f/2.8 + 0.9EV, and
  • 20 w-s results in f/2 + 0.9EV

So we can conclude that minimum power on BRX500 results in about f/2.8 + 0.5EV...do you really think you will be needing less power than that?! You can always put a -1EV or -2EV ND filter on the camera lens, rather than the more cumbersome technique of gelling the light sources.
And if you use softboxes rather than the standard reflector, you will reduce light output by at least -1EV (and possibly more).

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The ­ Loft ­ Studios
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Dec 11, 2013 12:57 |  #9

wizard13 wrote in post #16518312 (external link)
For those of you that use Elinchrom strobes-
How do you achieve large apertures (f2.8 and larger) while using the strobes? Are you using ND filters on the camera? I have two BXR500's and looking to add another strobe but even the BRX250 only stops down to 16ws. Any suggestions?
Thanks!

Set your Camera (Canon 5DMIII and 7D :: Don't know about your 40D) to ISO Expansion Mode in the Custom Settings and now you can set your ISO to 50….. that will give you one stop!
I use Photogenics 1250DR's and the minimum is 15ws. Once you put on a soft box or light modifier, you'll get another 1-2 stops!

I just did a test with a 3x4 Photoflex Softbox at 4' and got the following:
ISO: 50
Power: 15ws
Aperture: f/2.03 (basically f/2.5)
Distance: 4'


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Dec 11, 2013 14:12 |  #10

Are you trying to balance window light with flash?


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Dec 11, 2013 14:32 |  #11

PacAce wrote in post #16518711 (external link)
A grid will also alter the quality of the light so it's not always an option.

True but it will drop about a stop of light


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Dec 11, 2013 14:40 |  #12

windpig wrote in post #16519400 (external link)
Are you trying to balance window light with flash?

I hear you are the guy to see about that.


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Dec 11, 2013 14:54 |  #13

Only because I've f**ked around with it enough, in fact enough that my mannequin got a tan. The Quadra or Ranger AS packs make it nice to be able to dial things down way low, but not low enough if using a reflector.:D


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wizard13
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Dec 11, 2013 19:13 |  #14

Wilt wrote in post #16518959 (external link)
I looked up the BRX250 on Elinchrom web site, but unfortunately they do not list any expected f/stop at any power levels. But we can start with BRX500 has minimum 32 w-s setting, while BRX250 has minimum 16w-s setting.

So I went to Paul Buff web site to get comparable outputs. Buff says at 5' from subject
  • 40 w-s should result in f/2.8 + 0.9EV, and
  • 20 w-s results in f/2 + 0.9EV
So we can conclude that minimum power on BRX500 results in about f/2.8 + 0.5EV...do you really think you will be needing less power than that?! You can always put a -1EV or -2EV ND filter on the camera lens, rather than the more cumbersome technique of gelling the light sources.
And if you use softboxes rather than the standard reflector, you will reduce light output by at least -1EV (and possibly more).

Thanks for the info!! Didn't realize Paul Buff put f-stops to the w/s output. So at 5' is the key here. Obviously more light the closer the subject is. Subtract out the softbox and add a ND filter and can achieve the look I want.
Thanks!


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wizard13
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Dec 11, 2013 19:13 |  #15

The Loft Studios wrote in post #16519200 (external link)
Set your Camera (Canon 5DMIII and 7D :: Don't know about your 40D) to ISO Expansion Mode in the Custom Settings and now you can set your ISO to 50….. that will give you one stop!
I use Photogenics 1250DR's and the minimum is 15ws. Once you put on a soft box or light modifier, you'll get another 1-2 stops!

I just did a test with a 3x4 Photoflex Softbox at 4' and got the following:
ISO: 50
Power: 15ws
Aperture: f/2.03 (basically f/2.5)
Distance: 4'

Thanks for the test! Completely forgot about ISO expansion.


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Elinchrom Low Power Output
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