Posted by ~P~ on 04/18/06 02:59

Drrr.... Yes, I went the wrong direction with my math there didn't I?
Happens... Meant more in the range of 1/30th of a second or a bit faster.

There are some technical reasons why a camera doesn't shoot at 1/1000th of a
second, mostly dealing with how much light is necessary to strike the film
to gain a proper exposure. But, more importantly, if you look at motion on
a single frame of a motion picture, you will see blurring. Like when you
take a photograph with a slow shutter speed - it is blurred. You say
"YUCK!" but, in video, when those blurred frames of motion are put together,
it creates a very natural and smooth motion. Our eyes react very natually
to this blurring - like when you wave a laser pen on the wall in a dark
room, you see a streak of light across the wall - but you KNOW that is only
one point of light! Our eyes naturally blur motion to make it smoother.
This is copied by motion picture cameras.

What does motion look like when you don't have a slower shutter speed?
Well, it's like the old claymation - Frosty The Snowman, where every
movement is a bit jerky. When an arm moves, there should be some blurring
there. If you have a decent camcorder, it may offer shutter speed controls
which allow for faster capture. I have this on my camera, and it really
doesn't look natural. The motion is a bit jerky because every frame is so
much cleaner. No blurring of motion = a cleaner single image, but it also
means more jerky appearance in the video.


"Karyudo" <karyudo_usenet@yahoo.com.remove.me> wrote in message
news:kcu342pmmt3pvej85mk6k0af4bvlo736v6@4ax.com...
On Sat, 15 Apr 2006 12:16:24 -0400, "~P~" <bmxtrix2005@cox.net> wrote:

>A film camera shoots 24 frames per second, but, it
>doesn't have a shutter speed of 1/1000th of a second - or 1/24th of a
>second. It shoots somewhere between. Likely about 1/20th of a second or
>so.

You do realize 1/20th of a second is slower than both 1/24th of a
second and 1/1000th of a second, so it's impossible for 1/20th to be
"somewhere between"1/24th of a second and 1/1000th of a second?

I don't think there's any technical reason why a film camera couldn't
shoot at 1/1000th of a second shutter speed. Other than the pulldown,
I also don't think a shutter speed quite near 1/24th of a second is
too difficult, either. Pretty sure a shutter speed of 1/20th of a
second *is* impossible -- since the film would be pulled down after
only 1/24th of a second.

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