Timescapes - Digital Timelapse Discussion
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Second Shooter Question
http://forum.timescapes.org/phpBB3/viewtopic.php?f=42&t=13185
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Author:  Mabou2 [ Fri Mar 18, 2016 10:14 am ]
Post subject:  Second Shooter Question

Hi all,

I have a new second shooter. I notice when doing a slide with pan, that the centerline fluctuates... moves to the left and right of center throughout the slide.
I have already tried the lash compensation and it makes a difference for how well the overall slide keeps toward the center, but it doesn't help with the random right to left fluctuations.

I am following Kesslers suggestion to mount a laser to the head and place a target 15' away, set the keyframes for 1 and 2, keeping the laser point in the center.... when I run the slide (20 seconds with 20% ramp), the laser point drifts as much as 2+ inches to each side of the centerline.... actually wiggles right and left quite a bit.

Any thoughts?
Matt

Author:  scotchtape [ Mon Mar 21, 2016 1:12 pm ]
Post subject:  Re: Second Shooter Question

Wow this sounds horrible. Maybe you have a defective unit? I keep trying to search for reviews on this thing but find very very little on it online.

http://support.kesslercrane.com/hc/comm ... nd-Shooter

Author:  Mabou2 [ Tue Mar 22, 2016 6:33 am ]
Post subject:  Re: Second Shooter Question

UPDATE:
Well then, I totally disassembled my CineSlider, re-set the belt tension, re-set the rollers, and now the Second Shooter seems to be tracking much more accurately.

Of interest, I made a 3-minute video that shows my tests regarding the accuracy and repeatability of the Second Shooter.

You might find this interesting...
https://vimeo.com/159949340

Author:  scotchtape [ Tue Mar 22, 2016 12:24 pm ]
Post subject:  Re: Second Shooter Question

I assume in timelapse mode it is much more accurate?
because this would be useless if it drifted that much in TL mode!

Author:  Mabou2 [ Tue Mar 22, 2016 6:27 pm ]
Post subject:  Re: Second Shooter Question

Hi Scotch...

I could be completely mistaken, but I really believe that the drift evident in my test is exceptionally low, kind of remarkable actually. You are looking at probably the equivalent of a 1000mm lens +/- in my test. Definitely a worst-case scenario for any slider, and from 14 feet away, it only drifts (on average) less than a half inch.

For a point of reference, most of the time on a slider you will use a wide to medium wide lens. Try videotaping with a 1000 mm lens while you walk, then try videotaping with a 28mm lens while you walk. The 1000 would be totally unacceptable but the 28 would look very smooth in motion.

Same thing here with the slider... I think. I also think it wouldn't matter if this was stop motion or continuous... but I could be wrong about that too... just brainstorming here.

Anyway, onward and upward!
Matt

Author:  scotchtape [ Mon Jun 20, 2016 3:37 pm ]
Post subject:  Re: Second Shooter Question

Been testing my SS unit and it doesn't seem nearly as accurate as yours :(

My latest test has been to mount just the pan/tilt to a tripod and set a diagonal move across a wall.
If I start scrubbing, the start and end points shift about 1/2 to 3/4 an inch on either side, and the start point is always off as well.
Eventually both points are off.

I compared it to my eMotimo and the eMotimo is more accurate in terms of maintaining the start and end position.

For a slider move, both drift in video mode at close range. At about 10ft away they are ok, but SS drifted a lot more than your unit, and start and end points also changed.
My slider is the ifootage shark s1 that I made custom motor brackets for, which is why I tested just the pan/tilt locked down to isolate the problem.

Seems like eMotimo is actually better at TL for consistency and framing, too bad it's too loud for video use.

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