Christopher Norin Posted March 3, 2010 Share Posted March 3, 2010 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! Link to comment Share on other sites More sharing options...
Mark Dunn Posted March 3, 2010 Share Posted March 3, 2010 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. Link to comment Share on other sites More sharing options...
Christopher Norin Posted March 3, 2010 Author Share Posted March 3, 2010 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? Link to comment Share on other sites More sharing options...
Christopher Norin Posted March 4, 2010 Author Share Posted March 4, 2010 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? Link to comment Share on other sites More sharing options...
Mark Dunn Posted March 4, 2010 Share Posted March 4, 2010 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.uk/Basic-Photography-...d/dp/0240515927 Apart from his 'Advanced Photography' Link to comment Share on other sites More sharing options...
Christopher Norin Posted March 4, 2010 Author Share Posted March 4, 2010 (edited) 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.uk/Basic-Photography-...d/dp/0240515927 Apart from his 'Advanced Photography' Great! Thank you! Edited March 4, 2010 by Christopher Norin Link to comment Share on other sites More sharing options...
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