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FORUMS Cameras, Lenses & Accessories Canon G-series Digital Cameras 
Thread started 10 Nov 2005 (Thursday) 11:22
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Using studio strobes/manual flash with G6

 
Bosman
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Nov 11, 2005 16:53 as a reply to  @ post 916081 |  #16

kreego wrote:
Hello Bill,

At the risk of sounding like a rebel, I'll give you a brief description of how I've gotten into studio photography (really basic level for the time being) with my G6 and a couple of ancient flashes. I've totally bypassed the whole E-TTL issue here, because I don't want to second guess my own gear. This way I feel I'm in charge (sort of!)

The tools:
G6, M Mode
Canon 420EX flash
Vivitar 5600 flash, manual setting possible
Generic flash, one power output
Two optical slaves, one from Hama, one from Wein (regular types, fire on first flash)
Sekonic 308s light meter
umbrellas

The method:
Mount the 420EX on the G6, set the flash output level to its lowest setting.
Set up the two remotes : Vivitar as my main strobe, the generic as my secondary (background or hair light)
Meter the two remote strobes individually to get the ratio you want. The Vivitar I set to manual, and adjust as necessary; the generic, I move back and forth (light fall-off) until I get what I want - or stick some white tissue paper in front, to reduce output (really high-tech - works great!)
Fire the G6 and 420EX, which triggers the two remotes via optical slaves, and meter the outcome. I typically end up shooting for a combined meter reading of about F5.6 and 1/125 seconds - your settings will vary.

Important notes:
The 420EX will synchronize with the G-Series cameras at up to 1/640th sec, but you'll probably not be able to synchronize any non-Canon flashes faster than 1/250, so be sure you keep that in mind, or your remotes will not fire.

Also, you don't absolutely need a flash meter to get started, since you can preview the histogram to see if you're not blowing out the highlights. But to get reliable results, the meter is definitely a big advantage.

As mentioned above, firing the flash from the G6 is actually a good thing, because it provides fillin light. You'll need to adjust flash output to get the results you want. In many lighting configuration, there's a light right in line with the camera, anyway, so this is a good thing.

So to summarize - you'll need to master studio basics anyway, so you might as well control all aspects of your camera and light sources, and do everything manually. The Vivitar 283 is ideal for this kind of work, since you can control output from the flash itself, independently from the camera.

Hope this helps!

Christian

The 420ex can only sync up to 1/250.


Joe

Rebel XT with grip
Tamron SP AF28-75mm F/2.8 XR Di LD Aspherical (IF)
Canon 18-55 3.5-5.6
Canon 50 1.8
420EX
Domke
F-3X
Domke F-5XB

  
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kreego
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Location: Paris (Issy-les-Moulineaux) France
     
Nov 11, 2005 17:54 as a reply to  @ Bosman's post |  #17

Bosman wrote:
The 420ex can only sync up to 1/250.

Check the high-speed sync slider (right above the on/off) slider - it can be forced to sync a G Series and presumably other Canon bodies, at higher speeds. I just took some shots of a monitor I'm selling on ebay, at 1/640 - works great!

Cheers,

K


Canon 5D, 350D and grips
Sigma 24-70 2.8 EX DG Macro, 70-200 2.8 EX APO HSM, Canon EF 50 1.4
http://www.harberts.co​m/photo (external link)

  
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Bosman
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Nov 11, 2005 18:22 as a reply to  @ kreego's post |  #18

kreego wrote:
Check the high-speed sync slider (right above the on/off) slider - it can be forced to sync a G Series and presumably other Canon bodies, at higher speeds. I just took some shots of a monitor I'm selling on ebay, at 1/640 - works great!

Cheers,

K

I didn't know that my apologies. :o


Joe

Rebel XT with grip
Tamron SP AF28-75mm F/2.8 XR Di LD Aspherical (IF)
Canon 18-55 3.5-5.6
Canon 50 1.8
420EX
Domke
F-3X
Domke F-5XB

  
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twalker294
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Location: Louisiana, USA
     
Nov 13, 2005 01:02 as a reply to  @ Bosman's post |  #19

On the subject of using the 420EX as a master to fire slaves, this isn't a good idea. As part of the ETTL procedure, the 420 fires a preflash in order to set the white balance. This preflash will trigger your slaves prematurely. Now in some cases the slave might be able to recycle fast enough to fire again on the actual flash in which case it will work properly. In many cases however this will not work and the slave won't fire when the actual picture is taken.

I did an experiment with both my 10D and my G3. I mounted the 420EX to each then took a picture of my Vivtar 285HV with Wein peanut slave attached. If the slave fired in sync then the resulting photo will show the flash firing. On my 10D the flash was dark in every single shot -- the slave didn't fire with the camera once. When used with the 10D, the preflash from the 420 is so fast I can't see it and obviously it's too fast for the slave to recycle. On my G3, the first shot I took showed that the slave fired in sync with the shutter. I took another within about 5 seconds and it was dark. Two more within about 5 more seconds each were also dark. Then I waited about 15 seconds, long enough for the 285 to charge fully. The next shot showed the flash in sync. Subsequent shots at 5 second intervals were again dark. When used on the G3, there is enough space between the preflash and the actual flash that I can see both. This gap is obviously long enough for the 285 to recycle and fire again with the regular flash if it is fully charged to begin with. Of course if the 285 had been set to a higher power setting, this would not have been the case since it would have used more of its power on the first flash.

The moral of the story -- if you want to fire slaves, buy a cheap non-TTL external flash to use as a trigger unit.


Todd Walker
http://twalker294.post​erous.com/ (external link)http://www.twphotograp​hy.net (external link)
Canon 40D, 10D, G9, SX20IS, and SD500

  
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Robert_Lay
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Location: Spotsylvania Co., VA
     
Nov 13, 2005 09:48 as a reply to  @ post 915794 |  #20

woffles wrote:
If I under stand right, if you double the distance of a flash you cut its power to a fourth of what is was since light falloff is exponential. Something I just learned if I got that right.

Taking it one step at a time.
For a given flash unit, if you double the distance to the subject, the area covered by the flash at that new distance would be proportional to distance squared, or 4 X.

If the given amount of light is spread over an area 4X as large then the intensity of the light striking the object would be 1/4.

Each time we halve the intensity of light, we refer to that as a one-stop decrease, because we always work in logarithmic units to keep it simple.

Therefore, 1/4 the light is a two-stop reduction in light, and so the effect of doubling of the distance causes a fall-off of 2 stops.

Until you express the change in f-stops, it's not consistent with the way photographers operate.

I think we ended up with the same results - yes?


Bob
Quality of Light (external link), Photo Tool ver 2.0 (external link)
Canon Rebel XTi; EF-S 10-22mm f/3.5-f/5.6 USM; EF-S 18-55 mm f/3.5-f/5.6; EF 28-135mm f/3.5-5.6 IS USM; EF 50mm f/1.4 USM; Canon Powershot G5; Canon AE1(2); Leica R4s; Battery Grip BG-E3; Pentax Digital Spotmeter with Zone VI Mod & Calibration.

  
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woffles
Senior Member
438 posts
Joined Jul 2005
Location: Colorado
     
Nov 22, 2005 01:31 as a reply to  @ Robert_Lay's post |  #21

Robert_Lay wrote:
Taking it one step at a time.
For a given flash unit, if you double the distance to the subject, the area covered by the flash at that new distance would be proportional to distance squared, or 4 X.

If the given amount of light is spread over an area 4X as large then the intensity of the light striking the object would be 1/4.

Each time we halve the intensity of light, we refer to that as a one-stop decrease, because we always work in logarithmic units to keep it simple.

Therefore, 1/4 the light is a two-stop reduction in light, and so the effect of doubling of the distance causes a fall-off of 2 stops.

Until you express the change in f-stops, it's not consistent with the way photographers operate.

I think we ended up with the same results - yes?

Sounds right to me!


Film is what you get when you don't brush your teeth.

  
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Using studio strobes/manual flash with G6
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