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Exposure for Super8 fastmotion


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#1 Christopher Norin

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Posted 03 March 2010 - 12:18 PM

Hi!

A very basic question, I will shoot Super8 in 6 fps to get a certain effect. As it's quite a while since I shot on film I can't remember if I'm suppose to set the f-stop 3 times under the correct exposure (6 x 3 = 24). Or do I punch in fps into the lightmeter, which then should give me the correct exposure for the fps I'm using. I do not want to mess up on exposure!

Help would be much appreciated!
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#2 Mark Dunn

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Posted 03 March 2010 - 12:54 PM

6x3=18. 6x4=24. Uncorrected, your exposure would be 2 stops over.
If your meter will read for 6fps, fine. Otherwise take a reading for 24 and stop down 2 stops.
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#3 Christopher Norin

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Posted 03 March 2010 - 01:26 PM

6x3=18. 6x4=24. Uncorrected, your exposure would be 2 stops over.
If your meter will read for 6fps, fine. Otherwise take a reading for 24 and stop down 2 stops.


Yes, ofcourse. What I meant to write was 8 fps. What I dont't understand is, if I shoot a third of normal speed, why don't I underexpose three stops?
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#4 Christopher Norin

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Posted 04 March 2010 - 09:53 AM

Yes, ofcourse. What I meant to write was 8 fps. What I dont't understand is, if I shoot a third of normal speed, why don't I underexpose three stops?


I'm still very much interested in this, and is there somewhere on the web I can read up some more on these basic aspects of slowmotion/fastmotion exposure?
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#5 Mark Dunn

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Posted 04 March 2010 - 11:54 AM

The relationship between aperture and shutter speed is reciprocal- open the aperture and you need to reduce the shutter speed, and vice versa.
When you undercrank, the shutter speed increases, so you stop down. 24 down to 8 fps is a factor of 3, or about 1.7 stops, a stop being a difference in exposure of 2x. 3 stops would be a factor of 2x2x2=8, not 3.
A basic book on photography is what you need. Perhaps another poster will recommend a resource.
I can only recommend this, the only technical photography book I have ever bought.
http://www.amazon.co...d/dp/0240515927
Apart from his 'Advanced Photography'
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#6 Christopher Norin

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Posted 04 March 2010 - 05:52 PM

The relationship between aperture and shutter speed is reciprocal- open the aperture and you need to reduce the shutter speed, and vice versa.
When you undercrank, the shutter speed increases, so you stop down. 24 down to 8 fps is a factor of 3, or about 1.7 stops, a stop being a difference in exposure of 2x. 3 stops would be a factor of 2x2x2=8, not 3.
A basic book on photography is what you need. Perhaps another poster will recommend a resource.
I can only recommend this, the only technical photography book I have ever bought.
http://www.amazon.co...d/dp/0240515927
Apart from his 'Advanced Photography'


Great! Thank you!

Edited by Christopher Norin, 04 March 2010 - 05:53 PM.

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