7D's and problems when using speedlites
- Thread starter Koolvin
- Start date
does anyone know how to turn off internal fire when using wireless?
I know that already - you are not getting my point.
Infrared / RF control
If you shoot into a mirror you clearly can see both flash firing.
- Messages
- 230
- Name
- mike
- Edit My Images
- Yes
check out this tutorial
http://digital-photography-school.com/how-to-control-multiple-flashes-wirelessly-with-a-canon-7d
http://digital-photography-school.com/how-to-control-multiple-flashes-wirelessly-with-a-canon-7d
Thanks, but it doesn't help - I know most of that.
- Messages
- 27,793
- Edit My Images
- Yes
Not sure about the Canon set up, but with Nikon there is an option to set the onboard flash to --- which just sends out a pre-flash but doesn't, in theory, contribute to the exposure.
ok found the info - as already suggested its not ir/radio
(where is the thanks button on this site?)
Wonder why shooting into a mirror catches both flashs?
Source: http://photography-on-the.net/forum/showthread.php?t=767760
3. How does it work?
The built-in flash emits a burst of flashes before the cameras shutter is opened to instruct the remote flashes to fire and to communicate the requested flash ratios and measure flash exposure. When the shutter actually opens, the built-in flash will fire again in one of two modes:
1) If the built-in flash iss enabled for the actual exposure, it will fire at a predetermined output level to contribute to the exposure.
2) If the built-in flash is only used to control the external Speedlites, it will fire at a very low power just to finally trigger the external flashes and not to contribute to the final exposure.
----------------------------------------------------------------------------------------------
4. I only want the external flashes to fire, but my built-in flash still fires?
When you set the camera to only control the external Speedlites, the built-in flash will still fire it's pre-flash to communicate with the external Speedlites. After the preflash, the built-in flash will emit a very low power flash when the shutter opens to signal the external flashes to fire. This sync-flash will not contribute to the final exposure (or minimally so).
(where is the thanks button on this site?)
Wonder why shooting into a mirror catches both flashs?
Source: http://photography-on-the.net/forum/showthread.php?t=767760
3. How does it work?
The built-in flash emits a burst of flashes before the cameras shutter is opened to instruct the remote flashes to fire and to communicate the requested flash ratios and measure flash exposure. When the shutter actually opens, the built-in flash will fire again in one of two modes:
1) If the built-in flash iss enabled for the actual exposure, it will fire at a predetermined output level to contribute to the exposure.
2) If the built-in flash is only used to control the external Speedlites, it will fire at a very low power just to finally trigger the external flashes and not to contribute to the final exposure.
----------------------------------------------------------------------------------------------
4. I only want the external flashes to fire, but my built-in flash still fires?
When you set the camera to only control the external Speedlites, the built-in flash will still fire it's pre-flash to communicate with the external Speedlites. After the preflash, the built-in flash will emit a very low power flash when the shutter opens to signal the external flashes to fire. This sync-flash will not contribute to the final exposure (or minimally so).
- Messages
- 27,793
- Edit My Images
- Yes
The Nikon is IR-based,you can block the visible emission from the onboard flash with one of these
the SG-3IR, which only allows the IR part of the flash through
- Messages
- 1,336
- Edit My Images
- Yes
Hi,
I think you have found the solution which was discussed earlier this year in my thread - click here:
Although the on-board-flash of the 7D does always flash even if you select Speedlites only, it only affects the results of your photo if you are taking something fairly close up - in my example I was about 18 inches away from the subject and could just about see an additional reflection - anything further away and it was okay.
You can test it out by turning off the speedlites and then taking a photo, it should come out black..... to prove it only emits a very low power flash that triggers the speedlites and not illuminate the subject.
What I do now when taking close-up shots is to place a piece of card over the on-board flash as I depress the shutter button thus blocking any light moving forwards, the card does not stop the camera triggering the speedlite- other suggestions which I have not tried are to place a piece of unprocesed slide film over the camera flash or wrap several pieces of "quality street" wrappers.
Regards
I think you have found the solution which was discussed earlier this year in my thread - click here:
Although the on-board-flash of the 7D does always flash even if you select Speedlites only, it only affects the results of your photo if you are taking something fairly close up - in my example I was about 18 inches away from the subject and could just about see an additional reflection - anything further away and it was okay.
You can test it out by turning off the speedlites and then taking a photo, it should come out black..... to prove it only emits a very low power flash that triggers the speedlites and not illuminate the subject.
What I do now when taking close-up shots is to place a piece of card over the on-board flash as I depress the shutter button thus blocking any light moving forwards, the card does not stop the camera triggering the speedlite- other suggestions which I have not tried are to place a piece of unprocesed slide film over the camera flash or wrap several pieces of "quality street" wrappers.
Regards