Dynamic camera movements can really increase the value of your production, but also requires more man power (and budget). The ideas within this article are based on setting up a second camera on a Video Slider without having a second Camera Operator (completely unattended). This 'B' camera angle offers dynamic movements so that you can cut away to the footage when needed. This is an excellent idea and a few companies are already on the ball with new products (coming soon).
First up is the Kessler Parallax system that offers a mechanical Parallax panning motion to your video head as it tracks left and right. Neat trick, but to get this fully automated you'll have to tie in to the Kessler Oracle system, which not only adds additional cost in the end, but extra equipment to assemble during production. More info at https://www.kessleru.com/2013/09/update-kessler-parallax/
Next we have the RedRock Micro One Man Crew. This motorized slider offers a curved (Parabolic) track to keep your subject in focus as it moves left to right (and back again). Completely silent with options to set a limit on range, and control speeds. The best part is that it is an all in one solution that's quick to set up and quick to store away. Starting at $1500 dollars (seen here), it carries a decent price tag, but it will save you from hiring an extra person to man a sliding camera. After finishing this article, you may come to realize the price to be very reasonable. More info at https://store.redrockmicro.com/OneManCrew
Now i've been asked several times if this was something that could be built at home (a.k.a DIY). Here i'm going to introduce a very basic concept on how i've managed to accomplish the same 'ping-pong' / 'back-forth' effect on a cheap DIY motorized slider kit (seen here) with an additional $10 dollars worth of switches, wiring, and a relay, and absolutely no programming. It's basically a simple and dumb electro-mechanical system.
Unmanned, unattended, looping, automated, it all sounds pretty good. Yet you can see how this basic system fails to provide many of the 'Smart' features of the more expensive products coming to market. On the flip-side, one advantage is that with this basic circuit one can expand this idea outside of just a typical slider. (Yes i'm already working on those ideas).
First Test - Building the Circuit Automated Looping Motorized Slider
Here's a schematic of my layout. You'll notice how each side of the motor has both negative and positive from the battery, but only one set is active from the DPDT.
Click for Larger Version
Two 3 Pin NO+NC Momentary Micro Switches (as found here) at each end reverse the polarity of the motor each time they are triggered.
A 12V DPDT Relay (as found here) is either 'Always ON' until the slider reaches the opposite switch which drops power to the relay.
In one direction, the relay is technically 'STUCK ON' by way of a tricky little feedback loop in the circuit. To turn the entire slider on or off, i'm just using the switch from the battery. In this example, i'm not using a speed controller, but one can easily be added.
[Update] If you have trouble following the schematic, I have another article with an easier way to create this setup. Others have successfully got their own sliders working. Check out the other article (found here).