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idolize55

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Since: Nov 07, 2004
Posts: 23



(Msg. 1) Posted: Tue Dec 14, 2004 12:10 am
Post subject: RB problem
Archived from groups: rec>photo>equipment>medium-format (more info?)
I'm very upset. I hired a couple models for a couple shoots I was doing this
past weekend and apparently I have no idea what I'm doing with my RB67. I got
all 4 rolls of film back and they were both so dark that you couldn't even see
any frame marks whatsoever.

Here's what I did: I was using a Profoto strobe kit with 2 heads and took meter
readings (which I know how to do, believe it or not). For the first shoot I
used my newly-purchased 50mm lens. I noticed that when I switched the setting
over to "X" the strobes wouldn't go off. Thinking I may have made a mistake by
using the "X" mode, I switched it over to "M" and the strobes worked. I also
used the "M" mode on my 2nd shoot, when using my 90mm lens. Now, what I can't
figure out is, why didn't I get any exposures on my film? I bracketed like
crazy. If I remember correctly, the last time I used strobes and got good
results I used the "X" mode. Was I supposed to use the "Mirror up" feature? Was
I supposed to use the "X" mode, but it may just not be working on my new lens?

Any help is appreciated.

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user1304

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Since: Sep 11, 2004
Posts: 11



(Msg. 2) Posted: Tue Dec 14, 2004 1:22 am
Post subject: Re: RB problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Idolize55 wrote:
 > I'm very upset. I hired a couple models for a couple shoots I was doing this
 > past weekend and apparently I have no idea what I'm doing with my RB67. I got
 > all 4 rolls of film back and they were both so dark that you couldn't even see
 > any frame marks whatsoever.
 >
 > Here's what I did: I was using a Profoto strobe kit with 2 heads and took meter
 > readings (which I know how to do, believe it or not). For the first shoot I
 > used my newly-purchased 50mm lens. I noticed that when I switched the setting
 > over to "X" the strobes wouldn't go off. Thinking I may have made a mistake by
 > using the "X" mode, I switched it over to "M" and the strobes worked. I also
 > used the "M" mode on my 2nd shoot, when using my 90mm lens. Now, what I can't
 > figure out is, why didn't I get any exposures on my film? I bracketed like
 > crazy. If I remember correctly, the last time I used strobes and got good
 > results I used the "X" mode. Was I supposed to use the "Mirror up" feature? Was
 > I supposed to use the "X" mode, but it may just not be working on my new lens?
 >
 > Any help is appreciated.
Hi,
You have to use X mode for strobes. M mode is for bulbs which take some
time to flash. When using strobes in M mode they will go of to fast and
will be done when the shutter opens.

Michiel Fokkema<!-- ~MESSAGE_AFTER~ -->

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user111

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Since: Jun 10, 2004
Posts: 316



(Msg. 3) Posted: Tue Dec 14, 2004 1:22 am
Post subject: Re: RB problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Michiel Fokkema" posted:
"...
I switched it over to "M" and the strobes worked. I also
used the "M" mode on my 2nd shoot, when using my 90mm lens. Now, what I
can't
figure out is, why didn't I get any exposures on my film?
...."

Simple.

The "M" sync mode is designed for flashbulbs. Since the flashbulb creates
light by actually burning a flammable filament, it takes some time for that
reaction to "get going." "M" sync triggers the flashbulb, and then 28
milliseconds later, triggers the camera's shutter. Since an electronic
flash (strobe) has a flash duration of somewhere between 0.1 millisecond
and 2.5 millisconds, the flash was totally completed well before the
shutter opened.

If "X" sync does not work ... you need to get it fixed.
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user1212

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Since: Nov 24, 2003
Posts: 5



(Msg. 4) Posted: Tue Dec 14, 2004 3:27 pm
Post subject: Re: RB problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
You say you got the film back and it was "so dark I couln't even see any
frame marks"

This is totally at odds with what other posters have responded about the
X vs. M flash sync. They are correct in stating that you missed the
flash by using M sync with electronic flash heads. However, this would
result in nearly clear film since you have no exposure. If you indeed
meant that the film is nearly opaque, you have another problem besides a
non-working X-sync. Either your exposure calculation is very wrong or
you have a misfiring shutter or an enormous light leak.
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ibarakicho1

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Since: Dec 09, 2004
Posts: 3



(Msg. 5) Posted: Tue Dec 14, 2004 6:28 pm
Post subject: Re: RB problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
David Strip wrote:
 > You say you got the film back and it was "so dark I couln't even see
any
 > frame marks"
 >
 > This is totally at odds with what other posters have responded about
the
 > X vs. M flash sync. They are correct in stating that you missed the
 > flash by using M sync with electronic flash heads. However, this
would
 > result in nearly clear film since you have no exposure.

Perhaps he's talking about his proof sheets.

If you indeed
 > meant that the film is nearly opaque, you have another problem
besides a
 > non-working X-sync. Either your exposure calculation is very wrong or
 > you have a misfiring shutter or an enormous light leak.<!-- ~MESSAGE_AFTER~ -->
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user1304

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Since: Sep 11, 2004
Posts: 11



(Msg. 6) Posted: Wed Dec 15, 2004 1:24 am
Post subject: Re: RB problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
David Strip wrote:
 > You say you got the film back and it was "so dark I couln't even see any
 > frame marks"
 >
 > This is totally at odds with what other posters have responded about the
 > X vs. M flash sync. They are correct in stating that you missed the
 > flash by using M sync with electronic flash heads. However, this would
 > result in nearly clear film since you have no exposure. If you indeed
 > meant that the film is nearly opaque, you have another problem besides a
 > non-working X-sync. Either your exposure calculation is very wrong or
 > you have a misfiring shutter or an enormous light leak.
 >
 >
He probably used slide film.

Michiel Fokkema<!-- ~MESSAGE_AFTER~ -->
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idolize55

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Since: Nov 07, 2004
Posts: 23



(Msg. 7) Posted: Wed Dec 15, 2004 10:39 am
Post subject: Re: RB problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
  >> You say you got the film back and it was "so dark I couln't even see any
  >> frame marks"
  >>
  >> This is totally at odds with what other posters have responded about the
  >> X vs. M flash sync. They are correct in stating that you missed the
  >> flash by using M sync with electronic flash heads. However, this would
  >> result in nearly clear film since you have no exposure. If you indeed
  >> meant that the film is nearly opaque, you have another problem besides a
  >> non-working X-sync. Either your exposure calculation is very wrong or
  >> you have a misfiring shutter or an enormous light leak.
  >>
  >>
 >He probably used slide film.
 >
 >Michiel Fokkema
 >
 >
 >
 >

Yes, it was slide film.<!-- ~MESSAGE_AFTER~ -->
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rwatson767

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Since: May 27, 2004
Posts: 75



(Msg. 8) Posted: Thu Dec 16, 2004 4:20 am
Post subject: Re: RB problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Mirror up in M or N? You should be using N unless you have a purpose in using
M. Or a shutter problem.

Bob AZ
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