How to Use a Jackscrew for Follow Focus Markers
By Filmgear Canada | Published: 2026-10-28
Category: How-to Guides
Learn how to set up and adjust a jackscrew for follow focus markers to achieve repeatable focus pulls on your cinema rig with this step-by-step guide.
Quick Answer
To use a jackscrew for follow focus markers, mount the marker on the jackscrew, set the jackscrew against the follow focus gear, and adjust it to mark your focus stops for repeatable pulls.
Why a Jackscrew Improves Focus Pulls
A jackscrew for follow focus markers gives you a precise, adjustable stop that helps you return to the same focus position take after take. It is especially useful when you are working alone or need to hit critical marks quickly.
Unlike tape marks on a lens barrel, a jackscrew attaches to the follow focus itself, so your marks stay consistent even if the lens rotates slightly during a take.
Compatibility Considerations
Before you buy, check that the jackscrew matches your follow focus model and rod setup. The SHAPE Jackscrew for Follow Focus Markers is a model-specific option, so confirm the interface and fit with your rig to avoid a loose or non-functional setup.
If you are between follow focus systems, verify the thread size and mounting points, as not all jackscrews are universal.
Step-by-Step Setup and Adjustment
- Mount the Jackscrew: Attach the jackscrew to the follow focus marker slot or designated mounting point on your follow focus unit. Tighten it securely, but avoid over-torquing the threads. Check that the jackscrew sits flush and does not wobble before moving on.
- Set the Starting Position: Rotate the jackscrew so its tip contacts the follow focus gear or stop at your desired near focus mark. Lock it in place with the locking nut if available. Make sure the jackscrew does not interfere with the gear rotation when you pull focus.
- Mark Your Focus Stops: Use the jackscrew as a physical stop to set your focus marks. Pull focus to each critical distance and adjust the jackscrew to halt at the exact point. Test the movement several times to confirm repeatability. Recheck the jackscrew tightness after a few pulls, as vibration can loosen it.
Product Spotlight
- SHAPE Jackscrew for Follow Focus Markers: The SHAPE Jackscrew for Follow Focus Markers is a manual follow-focus component for repeatable focus control on cinema and production rigs. It gives you a reliable mechanical stop to hit the same focus mark consistently, which is essential for professional focus pulls.
SHAPE Jackscrew for Follow Focus Markers
