Tabletop Demonstrator

Knot-tying instruction is a difficult subject to film. If you don't believe me, go onto YouTube and just search for knots. The problem is that the easiest angle to film is from the front, but if you try to follow along and tie the knot, everything is in reverse. The best angle for instruction is from the perspective of the knot-tyer. But most videos from that angle are really jerky as someone attaches the camera to their head to get a "point of view" recording.

So I came up with a PVC contraption, originally called the Knot Demonstrator. It allows you to film directly downwards, which works pretty well for filming knot-tying. But then my wife wanted to digitize some artwork that wouldn't fit in the scanner, and we discovered that the Knot Demonstrator works for that, too. So after a lot of experimentation and changes, I've come up with a stable design that allows you to film and photograph anything from directly above. The new name is Tabletop Demonstrator because it can be used for much more than just knot videos.

Materials:
(All 3/4" sch 40 PVC or fittings)

Tubing:*
Legs -- 4x 21.5"
Crossbeams -- 4x 9"
Z-Beams -- 4x 10.5"
Stabilizers -- 2x 7"
Hidden Connectors -- 6x 1.5"
* A note on lengths: These lengths are set up with my specific camera in mind. Depending on how wide of an angle your camera has, you may need to change the dimensions slightly. If, when you have everything set up correctly, you can see any of the PVC, you either need to shorten the legs or make the Z-Beams or Crossbeams longer.

Fittings:
2 End Caps
8 90-degree elbows
8 Tees

By the way, you may notice that there's an extra Tee between the lower crossbeams. I don't know what it's doing there, but it seemed to be a handy place to put a connector (possibly for future modifications).

Price: Around $10.00, unless you have all the parts lying around (like I do)
Build time: 15 minutes, more if you need to adjust the height or width
Availability of materials: Readily available
Durability: It's PVC. Plenty durable for indoor work
Functionality: Works very well for what it's designed for
Portability: Somewhat large and bulky, but it can fold up into a smaller size (see future post)

UmbrellaPod

Here's an idea I've had kicking around for a while. Go to your local dollar store and buy a cheap umbrella (not an automatic). Take off the handle, but leave the long neck tube. Slide the tube into a 1/2" or 3/4" PVC pipe, and connect like the diagrams show. Use the PVC Camera Mount (shown in blue) to connect the contraption to your camera (in dark grey), and there you have it.

There are two basic configurations. The first has the camera coming off a pole (in actuality, two pieces of PVC pipe divided by a T connector). The weight of the camera makes it front heavy, but it will allow you to turn the camera sideways for profile shots.



The second design puts the weight of the camera directly over the monopod pole, but it also eliminates the ability to turn the camera sideways.



And of course, you can eliminate the pole altogether and use it for mobile shots.


Price: Under $5.00, if you can find a dollar store umbrella.
Build time: 10 minutes, assuming the handle comes off the umbrella.
Availability of materials: Readily available.
Durability: The PVC is durable; if you buy a cheap umbrella, I doubt it will last too long.
Functionality: Having never built one of these, I can only speculate that with any sort of wind, the umbrella may go flying (once I actually build one, I'll see if I can think of an easy way to secure it). Other than that, I can see how this could come in very handy.
Portability: About the same as a PVC monopod.

PVC Camera Mount Secured

One of the possible drawbacks to the PVC camera mount is that the entire thing is only held together by friction. Theoretically, the camera mount, and the camera, could slip out of its socket and then bye bye $3,000 digital SLR.

The first solution is to never trust an expensive camera to my setup. I mean, it is homemade out of a dollar's worth of hardware. If you can plonk down a couple thousand for a camera, you should be able to afford a $50 tripod.

The other solution is a locking mechanism that I haven't tested extensively, but seems to work pretty well.

The mechanics are simple. Drill two holes in the camera mount on each side. Do the same for the PVC fitting. Align the holes in the two pieces, then bend a coat hanger or bike spoke so that it fits snugly into the holes. Slide the clip into the holes, and there you go -- a secure connection that won't slip out no matter how hard you shake it.



One thing that I've found useful is to make the wire clip off-centered a little bit. It helps make slipping it into the holes a little easier.


Having shown this design, I want to point out that I probably won't be using it normally. It adds one more element of hassle, and the basic mount is secure enough that I've never worried about my camera falling off.

However, there are a few designs I've got running around in my head where a little extra security might be nice.

Price: Free, if you've got a metal coat hangar lying around.
Build time: 10 minutes, with a drill, wire cutters, and some pliers.
Availability of materials: Readily available.
Durability: Medium to High. The metal clip may fatigue eventually, but it should be fine for a while.
Functionality: Quick and easy, works great.
Portability: Only takes slightly more room than the camera mount.

PVC for PVC Camera Mount

I've gotten a few questions about the thing-walled PVC tubing for my PVC Camera mount. I've looked it up, and when you go to the hardware store, if you want to sound smart, ask for the 3/4 inch PVC SDR Schedule 21. You can read more about it here.

Around here, I know Lowe's carries it, but I don't know where else to find it. But Lowe's doesn't carry the flat top caps; only round ones. The person helping me at Lowe's suggested trying a sprinkler supply store or a plumbing specific store.

Hope this helps!