Shutter speed of PLC's...

ChristopherCoy

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Does anyone know what the shutter speed is when a flash is plugged into the PC connector on a Polaroid 250?

I'd like to try using a sync cord with one of our AB400 lights, but need to find out where to set the power.
 

Steve Smith

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I don't know what the speed will be but why would it affect the power you need to set?


Steve.
 
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ChristopherCoy

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f8 at 1/125th is brighter than f4 at 1/125th isn't it?
 

MattKing

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ChristopherCoy said:
f8 at 1/125th is brighter than f4 at 1/125th isn't it?
Click to expand...

Christopher:

We are really confused!

In your question, did you actually mean to ask about the aperture set by the camera, rather than the shutter speed?
 
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ChristopherCoy

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Yeah. I think I've confused myself. It was a very long day yesterday.

For starters, I thought that I had read somewhere that when you plug a flash into the pc socket on the camera, it restricts the shutter to one particular speed. I could be wrong, but I could swear that I read that somewhere.

Secondly, if I think about the exposure triangle, I have ISO, SS, and Aperture. In this particular case, my only certain is the film speed, ISO 100. The electric eye on the camera sets the SS and Aperture 'automatically'. My issue is that wouldn't the camera be metering itself off the ambient modeling light of my strobe? If thats the case, when I trip the shutter, if my strobe is at full power it is going to blow out the frame. Correct?
 

Steve Smith

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ChristopherCoy said:
My issue is that wouldn't the camera be metering itself off the ambient modeling light of my strobe? If thats the case, when I trip the shutter, if my strobe is at full power it is going to blow out the frame. Correct?
Click to expand...

Probably. But it is possible (however unlikely) that it could select an aperture together with a long shutter speed for the ambient light that just happens to be the correct aperture for the flash you are using.

Is it fully automatic or do you have some aperture control?



Steve.
 
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ChristopherCoy

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All three of the models I have are 'automatic'. I can't afford the manual models, they are still commanding $400/$500 pricetags.

The only aperture control on the automatic models that I have (104, 420, and 250) is the 'lighten/darken' setting.
 

markbarendt

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Shutter speed normally only affects the ambient light.

This is because the actual pop is really fast; 1/1,000 of a second is a long duration for an real life pop, 1/10,000 of a second isn't outside the norm.
 
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