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<blockquote data-quote="J-see" data-source="post: 429395" data-attributes="member: 31330">I couldn't sleep. I need to get my head around this and find the logic. I assume (hope) I'm almost there.My flash sync speed is 1/250s. That means at a shutter of 1/250s, the first curtain has fully opened since my sensor is fully exposed and the second curtain still has to start closing.So the speed my curtain travels is 4000 pixels (ignoring the 16) during 1/250s since it moves vertically. (if we assume 1/250s to be the correct speed)If I then pick a shutter of 1/500s, I need half the exposure time which means the slit has to become half the sensor; 2000 pixels.If I keep upping the shutter, my slit becomes smaller and at 1/4000s that should be some 250 pixels. That's 250*5.9 micron = about 1.5mmIs that about right this far? In this case the movement of the curtains remains identical but because the slit gets smaller, the exposure decreases.</blockquote>

[QUOTE="J-see, post: 429395, member: 31330"] I couldn't sleep. I need to get my head around this and find the logic. I assume (hope) I'm almost there. My flash sync speed is 1/250s. That means at a shutter of 1/250s, the first curtain has fully opened since my sensor is fully exposed and the second curtain still has to start closing. So the speed my curtain travels is 4000 pixels (ignoring the 16) during 1/250s since it moves vertically. (if we assume 1/250s to be the correct speed) If I then pick a shutter of 1/500s, I need half the exposure time which means the slit has to become half the sensor; 2000 pixels. If I keep upping the shutter, my slit becomes smaller and at 1/4000s that should be some 250 pixels. That's 250*5.9 micron = about 1.5mm Is that about right this far? In this case the movement of the curtains remains identical but because the slit gets smaller, the exposure decreases. [/QUOTE]

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