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dopey468


4 posts

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dopey468 Basic Member
Tue 24-Jul-01 06:01 AM

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

jrp

San Pedro Garza García, MX
36717 posts

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#1. "RE: monitor pre-flashes" | In response to Reply # 0

jrp Administrator JRP is one of the co-founders, has in-depth knowledge in various areas. Awarded for his contributions for the Resources Charter Member
Tue 24-Jul-01 10:08 PM

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.

Have a great time
JRP (Nikonian at the north-eastern Mexican desert) My profile
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f5fstop

Private, UM
2947 posts

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#2. "RE: monitor pre-flashes" | In response to Reply # 0

f5fstop Awarded for his contributions to the Resources Basic Member
Wed 25-Jul-01 12:49 AM

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"

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02496955


2 posts

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#3. "RE: monitor pre-flashes" | In response to Reply # 2

02496955 Basic Member
Wed 25-Jul-01 10:36 PM

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

f5fstop

Private, UM
2947 posts

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#4. "RE: monitor pre-flashes" | In response to Reply # 3

f5fstop Awarded for his contributions to the Resources Basic Member
Wed 25-Jul-01 11:55 PM

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

02496955


2 posts

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#5. "RE: monitor pre-flashes" | In response to Reply # 3

02496955 Basic Member
Tue 31-Jul-01 01:51 AM

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.

f5fstop

Private, UM
2947 posts

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#6. "RE: monitor pre-flashes" | In response to Reply # 5

f5fstop Awarded for his contributions to the Resources Basic Member
Tue 31-Jul-01 10:17 AM

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

pjmckenna


17 posts

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#7. "RE: monitor pre-flashes" | In response to Reply # 0

pjmckenna Basic Member
Thu 26-Jul-01 08:24 AM

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

G