Want more precision in your focus adjustments when shooting video with your DSLR, but don’t want to shell out money for a pricey follow focus? Flickr user Adam Lisagor shot this photo showing how he created his own DIY follow focus for $6. All you need is a steel hose clamp, drawer handle, nut, and bolt. Drill a hole through the clamp, and put it together as shown above.
I put a rubber band around my focus ring before I put the clamp on it (to protect it). You can also put another rubber band on the ring, draw your witness marks for focus, and wedge a paper clip in the focus pull ring to show you where your focus is.
There you have it, an easy way to get a handle on your focusing (pun intended).