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 realtime speed and repeatability - ya gotta see this 
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Joined: Wed Nov 11, 2009 10:45 am
Posts: 1685
Location: Merritt Island, Florida, Estates Unitas
Post realtime speed and repeatability - ya gotta see this
I just saw this and thought anyone interested in super accurate repeatable dolly moves for realtime compositing would be interested in this stepper driven dolly. Its insanely impressive. Remember, you can always slow it down to whatever speed you want (or whatever you think your camera can survive). Here's the link;

http://www.youtube.com/watch?v=OdJoVh6D ... grec_index


Tue Aug 23, 2011 7:05 am
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Joined: Wed Apr 15, 2009 4:13 am
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Location: Stavanger, Norway
Post Re: realtime speed and repeatability - ya gotta see this
Nice. Looks good. I´ve been wanting a dolly for some time now. Perhaps this is the way to go..

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Thu Aug 25, 2011 1:06 am
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Joined: Mon Dec 21, 2009 1:35 pm
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Location: Wroclaw, Poland
Post Re: realtime speed and repeatability - ya gotta see this
You have to be aware of the fact that with steppers you'll have serious issues with oscillations and vibrations populating the image with many cameras.
We've been through all this with DitoGear™ OmniSlider and that's why we decided to switch to Servo motors which give us great repeatability, high speed range and no oscillations.

Here are some repeatability tests w/ DitoGear™ OmniSlider Servo:






More info here:
http://forum.timescapes.org/phpBB3/viewtopic.php?f=46&t=5938
http://forum.timescapes.org/phpBB3/viewtopic.php?f=46&t=3904

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Sun Oct 30, 2011 3:35 am
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Joined: Wed Mar 16, 2011 2:58 pm
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Location: Denver, Colorado
Post Re: realtime speed and repeatability - ya gotta see this
Chronos uses a stepper and has no issues without oscillations or vibrations.

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Sun Oct 30, 2011 9:24 am
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Joined: Mon Nov 22, 2010 1:18 pm
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Post Re: realtime speed and repeatability - ya gotta see this
Are we talking shoot and move animation or real time moves ? Can see their might be a problem real time (not quite managed this yet so cant test it ) . But stop motion, cant see their would be a problem .
Like your test though Paco. Done multipass but not with the difference mode will give it a go . ;)


Sun Oct 30, 2011 10:39 am
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Joined: Wed Mar 16, 2011 2:58 pm
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Location: Denver, Colorado
Post Re: realtime speed and repeatability - ya gotta see this
So far almost all of my timelapses with chronos are continuous movement either linear speed or velocity ramped. It has the ability to do SMS but I'm still developing the trigger mechanism you can read about that on my project Zeus thread. I can feel very minor vibrations in the rail, as long as you do not hit the resonate frequencies in the rail I cannot imagine how a stepper could possibly vibrate the rail enough to cause visual artifacts in the image without serious design flaws,I could be misunderstanding what pack is referring to though.

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Sun Oct 30, 2011 4:07 pm
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