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bogolisk
Joined: 20 Dec 2009
Posts: 448
Expire: 2011-11-18
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 Posted: Mon Dec 06, 2010 5:47 pm Post subject: how does the camera freeze fast moving subjects |
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bogolisk wrote:
Long time ago, I read somewhere on the net that in order to freeze fast moving subjects, one should use at least 1/500s shutter speed. Something has been bugging my mind:
1. The shutter (or more accurately, the slit between the two curtains) doesn't move that fast.
2. If the slit only moves across the focal plane at 1/200, then why wouldn't we see weird, stretched-out subject in fast action shots?
Thank you
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kansalliskala
Joined: 19 Jul 2007
Posts: 5027
Location: Southern Finland countryside
Expire: 2016-12-30
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| Posted: Mon Dec 06, 2010 7:21 pm Post subject: Re: how does the camera freeze fast moving subjects |
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kansalliskala wrote:
| bogolisk wrote: |
2. If the slit only moves across the focal plane at 1/200, then why wouldn't we see weird, stretched-out subject in fast action shots?
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Yes we do
http://en.wikipedia.org/wiki/Focal-plane_shutter#Disadvantages
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William
Joined: 26 Nov 2009
Posts: 489
Location: London
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| Posted: Mon Dec 06, 2010 7:34 pm Post subject: |
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William wrote:
I can't answer your questions but this photo by Jacques Henry Lartigue is weird, stretched out and fast action. Admittedly it was taken in 1912 and shutters have advanced since then:
http://cllctr.com/view/44588a04a82321766daa4a1103db94b4
Freezing action is quite complicated business, from my observations taking photos from moving vehicles a 125mph landscape requires about 1/500th second. Distance is needed with fast action. |
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bogolisk
Joined: 20 Dec 2009
Posts: 448
Expire: 2011-11-18
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| Posted: Mon Dec 06, 2010 8:52 pm Post subject: Re: how does the camera freeze fast moving subjects |
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bogolisk wrote:
Thank you
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RioRico
Joined: 12 Mar 2010
Posts: 1120
Location: California or Guatemala or somewhere
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| Posted: Wed Dec 08, 2010 11:45 am Post subject: |
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RioRico wrote:
Some thoughts:
* 1/500 isn't faster than a speeding bullet. Sometimes even 1/4000 doesn't stop motion. A fast strobe stops motion.
* Motion won't stretch much at 1/4000. Motion isn't stretched on any of my cameras. Too bad. I could use the effect.
* Shutterless digital P&S's just read the sensor for a fraction of a second. So, no shutter effects that I know of.
* Would we like a digital camera that simulates shutter effects in-camera? Do we add such effects in PP? Why/not?
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