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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 25 Oct 2012 (Thursday) 19:32
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Firing 2 cameras at once

 
Ontario55
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Oct 25, 2012 19:32 |  #1

Is this possible ?

Lets say I put my T2i on a tripod pointed at an object
From another angle I hand hold my 7D
Can I take a picture with my 7D and have my T2i fire at exactly the same time ?
Distance between the 2 cameras would be approx 50' - 75'max
If its possible what do I need to accomplish this?
Thank you
Ontario55




  
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FlyingPhotog
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Oct 25, 2012 19:36 |  #2

Various brands of radio triggers can do this provided you have the right cable to go from the receiver to the slaved camera.

Done all the time in the sports world with (usually) Pocket Wizards


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gonzogolf
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Oct 25, 2012 19:38 |  #3

Its been discussed here before. You could use a wireless trigger with a reciever on each and get pretty close, but there is some mechanical lag between the signal and firing and it differs between models of camera (if not within different cameras of the same model) so you could get close but not perfect, maybe only fractions of a second apart.




  
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tongki
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Oct 25, 2012 19:46 |  #4

gonzogolf wrote in post #15169785 (external link)
Its been discussed here before. You could use a wireless trigger with a reciever on each and get pretty close, but there is some mechanical lag between the signal and firing and it differs between models of camera (if not within different cameras of the same model) so you could get close but not perfect, maybe only fractions of a second apart.

shutter delay will put it in the biggest difference


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talbot_sunbeam
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Oct 25, 2012 19:47 |  #5

I'm planning to do this, with a very similar setup.

I have a 7D, and a 450D.

On the 7D, I have a YN622 trigger, which is going to trigger a remote flash, and on top of the YN622 I have an RF602 transmitter (this is going to trigger the remote camera).

The 450D has the RF602 receiver connected to the cable release socket.

So, when I pull the trigger on the 7D, the 7D shutter triggers, the remote flash is fired, and the remote camera is fired, getting two lit angles.

While I haven't rigged this up yet (only just received the 622's yesterday) it should work fine in practice and other people have reported no issues with this.

So, it's really all about triggers. An rf602/603 pair is all you need - put the transmitter on the hotshoe of your handheld camera, and the receiver plugged into the cable release on the remote camera, and firing the main camera will also fire the remote.



7D, 450D | 17-55, 10-22, 55-250, 50 1.8, 580EXII | YN568II | YN622 x3 | Magic Lantern | (Still) Jonesing for a 70-200 2.8...
Turns out a gripped 7D + 622 + 580exII + 70-200 2.8 IS MK2 is BLOODY HEAVY! Who knew?!!

  
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gonzogolf
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Oct 25, 2012 19:49 |  #6

tongki wrote in post #15169815 (external link)
shutter delay will put it in the biggest difference

Mechanical lag was my way of lumping all that into one descriptor, but yes.




  
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gonzogolf
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Oct 25, 2012 19:51 |  #7

talbot_sunbeam wrote in post #15169820 (external link)
I'm planning to do this, with a very similar setup.

I have a 7D, and a 450D.

On the 7D, I have a YN622 trigger, which is going to trigger a remote flash, and on top of the YN622 I have an RF602 transmitter (this is going to trigger the remote camera).

The 450D has the RF602 receiver connected to the cable release socket.

So, when I pull the trigger on the 7D, the 7D shutter triggers, the remote flash is fired, and the remote camera is fired, getting two lit angles.

While I haven't rigged this up yet (only just received the 622's yesterday) it should work fine in practice and other people have reported no issues with this.

So, it's really all about triggers. An rf602/603 pair is all you need - put the transmitter on the hotshoe of your handheld camera, and the receiver plugged into the cable release on the remote camera, and firing the main camera will also fire the remote.

Are you saying the second camera would be in sync with the flash?




  
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talbot_sunbeam
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Oct 25, 2012 19:55 |  #8

That's the plan. :)

I'll rig it up in a sec, and see how it works in practice...



7D, 450D | 17-55, 10-22, 55-250, 50 1.8, 580EXII | YN568II | YN622 x3 | Magic Lantern | (Still) Jonesing for a 70-200 2.8...
Turns out a gripped 7D + 622 + 580exII + 70-200 2.8 IS MK2 is BLOODY HEAVY! Who knew?!!

  
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gonzogolf
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Oct 25, 2012 19:59 |  #9

talbot_sunbeam wrote in post #15169844 (external link)
That's the plan. :)

I'll rig it up in a sec, and see how it works in practice...

If the trigger sets the flash off and triggers the second camera its very likely that the flash will have fired before the shutter fires on the second one. Especially if you are using a flash with a short duration.




  
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talbot_sunbeam
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Oct 25, 2012 20:19 |  #10

So I just quickly rigged up a quick non-scientific test.

As suggested, there is too much shutter lag to get both cameras to get a shot with the flash. :(

I didn't have the cable I needed to rig up my perfect scenario, but as a test I tried:

Master 450D + 622 (for flash) + 602
Slave 7D + 602

and also:
Master 450D + 602
Slave 7D + 622 (for flash) + 622

In both cases, the camera that wasn't triggering the flash didn't get lit. I was actually quite surprised how much shutter lag there was. Now, of course I have two different radio triggers going here, which makes the situation less than ideal, so it might be possible that playing around with stuff and settings can get this to work, but it's so far not working as ideally as I'd like.

Of course, if you are just triggering a remote camera and not involving flashes/strobes, then it will work, but there is enough shutter lag (maybe a tenth of a second?) to cause a problem on action sports, and probably no problem with static or slower moving subjects. ymmv.



7D, 450D | 17-55, 10-22, 55-250, 50 1.8, 580EXII | YN568II | YN622 x3 | Magic Lantern | (Still) Jonesing for a 70-200 2.8...
Turns out a gripped 7D + 622 + 580exII + 70-200 2.8 IS MK2 is BLOODY HEAVY! Who knew?!!

  
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SkipD
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Oct 25, 2012 20:46 |  #11

Without doing any testing, it's my opinion that, in order to get the closest timing between two cameras, you would need two identical cameras and directly trigger both cameras with identical radio receivers that respond to the same transmitter. With a rather slow shutter speed, it MAY be possible to have both capture images lit by one flash burst.


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talbot_sunbeam
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Oct 25, 2012 21:12 |  #12

SkipD wrote in post #15169998 (external link)
Without doing any testing, it's my opinion that, in order to get the closest timing between two cameras, you would need two identical cameras and directly trigger both cameras with identical radio receivers that respond to the same transmitter. With a rather slow shutter speed, it MAY be possible to have both capture images lit by one flash burst.

Yep, that would be worth a shot.

I did try slowing down the shutter to about 1/20th, without any joy, but like I say, it may be possible by trying out different configurations and settings to get something that would sorta work.



7D, 450D | 17-55, 10-22, 55-250, 50 1.8, 580EXII | YN568II | YN622 x3 | Magic Lantern | (Still) Jonesing for a 70-200 2.8...
Turns out a gripped 7D + 622 + 580exII + 70-200 2.8 IS MK2 is BLOODY HEAVY! Who knew?!!

  
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apersson850
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Oct 26, 2012 05:19 as a reply to  @ talbot_sunbeam's post |  #13

Cameras like your 550D have shutter lags in the 100 ms range. That does of course imply that no focusing has to be done.


Anders

  
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dannybres
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Oct 26, 2012 05:57 |  #14

Would a wired solution be acceptable?

I have a few ideas.


EOS 7D, EOS M, EF-S 17-55mm f/2.8 IS USM, EF 70-200mm f/2.8L IS USM, 430EX II.

  
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wayne.robbins
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Oct 26, 2012 06:14 |  #15

I have a few Hahnel wireless RF remotes.. I'd set two on the same frequency... Then use the remote to trigger both. HW 433 80 is the model number..


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Firing 2 cameras at once
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