It's the cellphone, not the prop
05-17-2010, 03:31 PM
#1
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It's the cellphone, not the prop
Snapped this just before we ferried the Mooney back to home base after annual. There is nothing wrong with the prop. Can a photographer geek explain this one? Engine was at idle 1000-1200 rpm.
05-17-2010, 05:19 PM
#4
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You shot this with a digital?
The way it was explained to me (for what it's worth) is that the digital doesn't take all of the picture at a single moment, but "scans" the image. Since it goes from top right to bottom left (or some other pattern), the things in motion, like propellers, get "bent."
The higher end cameras seem to do better than the cheap point and shoots. I have a cheap point and shoot and get effects like that sometimes, while my wife has a nicer SLR and gets nice clean propellers even at takeoff RPM.
The way it was explained to me (for what it's worth) is that the digital doesn't take all of the picture at a single moment, but "scans" the image. Since it goes from top right to bottom left (or some other pattern), the things in motion, like propellers, get "bent."
The higher end cameras seem to do better than the cheap point and shoots. I have a cheap point and shoot and get effects like that sometimes, while my wife has a nicer SLR and gets nice clean propellers even at takeoff RPM.
05-17-2010, 05:34 PM
#5
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Originally Posted by msmspilot
You shot this with a digital?
Or it's a new fluid-dynamic constant speed prop. Changes both pitch and dihedral (is that the right term?)
05-17-2010, 09:24 PM
#6
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It's Salvador Dali's airplane
05-18-2010, 06:53 AM
#8
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Yeah this is due to each pixel being scanned at at a different time on a cheap (low speed) camera. A fast enough digital should be able to get all the pixels quickly enough to prevent (or minimize) this. I'm not sure what rotational speed would be needed to exceed the capability of the best digital cameras...probably more than piston-engine idle speed though.
Using a film camera with the wrong film and/or settings would produce a blurred image instead of bent.
Using a film camera with the wrong film and/or settings would produce a blurred image instead of bent.
05-18-2010, 01:22 PM
#9
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Originally Posted by rickair7777
Yeah this is due to each pixel being scanned at at a different time on a cheap (low speed) camera. A fast enough digital should be able to get all the pixels quickly enough to prevent (or minimize) this. I'm not sure what rotational speed would be needed to exceed the capability of the best digital cameras...probably more than piston-engine idle speed though.
Using a film camera with the wrong film and/or settings would produce a blurred image instead of bent.
Using a film camera with the wrong film and/or settings would produce a blurred image instead of bent.
cell phone cameras lightweight/underpowered cameras get the effect all the time
05-18-2010, 05:58 PM
#10
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The persistence of props
Originally Posted by tomgoodman
The Scanner Photography Project
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