We love to give away trade secrets. 

There are three reasons for this. 

First, there are no secrets, really.  Most smart art directors or advanced DP's who've been around for even a little while know their business, and already know all these alleged secrets. 

Second, it ticks off the competition.

Third, for those who have not had much experience in the particular things we write about,  it teaches them about something they can really use in their everyday work.   We hope.

So, for those in category one, press on.  Turn the page.   You already know this stuff.

Category two members will be cheesed off in a minute.  Good.  We like that.

Category three'ers, you are about to get a nifty new arrow for your quiver.

Now, tray tables up, and fasten seatbelts, please...

Not astonishingly, motion control means to move things.  Almost always this means in a repeatable, computer-controlled way.  You usually think of it as moving a camera, but it is also often used to move the photographic subject --