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Forums Lobby MASTER YOUR TOOLS Nikon Speedlights & Lighting topic #149
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Subject: "monitor pre-flashes" Previous topic | Next topic
dopey468     Basic Member Tue 24-Jul-01 07:01 AM
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"monitor pre-flashes"



LAST EDITED ON Jul-24-01 AT 08:01 AM (GMT)

I recently purchased into the Nikon family. Previous to this, I was shooting an old manual camera I have had for 17 years. I would have upgraded a long time ago but had stopped being a "Photographer" for about 12 years.

I have a sb-28 and is shooting in 3D matrix mode but have never seen the monitor pre-flashes. I understand it is very difficult to see but have tried under various conditions. I have a friend who just purchased the EOS 3 with Canon's Speedlite 550EX. I am able to see the evauluative pre-flashes from his flash almost everytime he takes a picture. Is there a way I can check my sb-28 to make sure it is functioning properly?

Thanks

  

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Replies to this topic
Subject Author Message Date ID
Reply message RE: monitor pre-flashes jrp Administrator JRP is one of the co-founders, has in-depth knowledge in various areas. Awarded for his contributions for the Resources
24th Jul 2001
1
Reply message RE: monitor pre-flashes f5fstop Awarded for his contributions to the Resources
25th Jul 2001
2
Reply message RE: monitor pre-flashes 02496955
25th Jul 2001
3
     Reply message RE: monitor pre-flashes f5fstop Awarded for his contributions to the Resources
26th Jul 2001
4
     Reply message RE: monitor pre-flashes 02496955
31st Jul 2001
6
          Reply message RE: monitor pre-flashes f5fstop Awarded for his contributions to the Resources
31st Jul 2001
7
Reply message RE: monitor pre-flashes pjmckenna
26th Jul 2001
5

jrp Administrator JRP is one of the co-founders, has in-depth knowledge in various areas. Awarded for his contributions for the Resources   San Pedro Garza García, MX  Charter Member Tue 24-Jul-01 11:08 PM
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#1. "RE: monitor pre-flashes"
In response to Reply # 0



Is there a way I can check my sb-28 to make sure it is functioning properly?

Well, the easiest way is to shoot a roll of slide film with it.

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f5fstop Awarded for his contributions to the Resources   Private, UM  Basic Member Wed 25-Jul-01 01:49 AM
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#2. "RE: monitor pre-flashes"
In response to Reply # 0



These pre-flashes happen so fast in the SB-28, that many people believe they are just part of the main flash. Remember, from the time you press the shutter release to the time the photo is taken is measured in milliseconds, and the time between the pre-flashes and the main flash are so close together, many people consider it all one flash.
However, have you tried to see if you can see the pre-flashes while someone else is taking your photo? It is almost impossible to see the pre-flashes from a photographer's point of view from behind the camera. However, it might be worthwhile to try.
However, as JRP states, take a roll of slide film with the flash and see how they turn out.

Also, since I'm not that familiar with Canon equipment this statement may be incorrect for that type of camera/flash combination. However, there are camera/flash combinations on the market that when triggered issue a series of flashe pulses versus one long duration flash. This is not to be confused with the Stroboscopic flash mode available on the SB-28, which creates some cool effects of moving object.



Doug


--Take only photographs, leave nothing but footprints--


NC, second week of October, 2001...



"Take only photographs, leave only footprints"


Click on image to view larger version

  

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02496955     Basic Member Wed 25-Jul-01 11:36 PM
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#3. "RE: monitor pre-flashes"
In response to Reply # 2



LAST EDITED ON Jul-26-01 AT 00:38 AM (GMT)

I do have a same question about monitor Pre-plashes. I think pre-plashes must be fire before shutter curtains open, so if pre-flashes exist, we can notice them in Slow Rear-Curtain Sync mode(Speed is more than 1 second). Please post results

  

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f5fstop Awarded for his contributions to the Resources   Private, UM  Basic Member Thu 26-Jul-01 12:55 AM
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#4. "RE: monitor pre-flashes"
In response to Reply # 3



You are right, preflashes are fired prior to the first curtain opening, and after the mirror has flipped up; the light is actually monitored off the shutter curtain. However, in slow sync, the preflashes would be the same since the curtain (shutter) opens as it would for any flash mode; however, the shutter closes after a longer period of time to allow for background ambient light to be captured on film.
As for posting results? What results would you like posted?

Doug


--Take only photographs, leave nothing but footprints--


NC, second week of October, 2001...



"Take only photographs, leave only footprints"


Click on image to view larger version

  

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02496955     Basic Member Tue 31-Jul-01 02:51 AM
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#6. "RE: monitor pre-flashes"
In response to Reply # 3



The results I like to post is ?do you see pre-flashes in Slow Rear-Curtain Sync mode?(Speed is more than 1 second)?. I don?t have SB28, but I test on build-in flash of F80 and SB26 on F80 (lens is Nikkor 80-200 f2.8D, then 3D Multi-Sensor Balanced Fill-Flash must be performed.). Here is result: I have not seen the pre-flashes, only the fash fires at the end of the exposure.

  

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f5fstop Awarded for his contributions to the Resources   Private, UM  Basic Member Tue 31-Jul-01 11:17 AM
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#7. "RE: monitor pre-flashes"
In response to Reply # 6



Makes sense to me, so that must be the way it operates. I personally, do not have the time to check out this flash mode, and I don't believe I have ever used it in prior shooting experiences.


Doug


--Take only photographs, leave nothing but footprints--


NC, second week of October, 2001...



"Take only photographs, leave only footprints"


Click on image to view larger version

  

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pjmckenna     Basic Member Thu 26-Jul-01 09:24 AM
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#5. "RE: monitor pre-flashes"
In response to Reply # 0



Dear Dopey,
The Cannon E-TTL flash system fires preflashes which are seen by the same evaluative meter what makes 'normal' metering of ambient light. Obviously the mirror must be down for this to work. The time between the preflashes and main discharge firing has the extra step of the mirror popping up in E-TTL compared to Nikon Matrix-balanced flash metering.
-Sneezey

  

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