This is a very simple follow-focus using a roller-blade or skateboard -wheel instead of gears. It's great to experiment with a follow focus on a shoulder-rig without investing a lot of time and effort into a more complex geared or even remote follow focus.

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This is a very simple follow-focus using a roller-blade or skateboard -wheel instead of gears.

It's great to experiment with a follow focus on a shoulder-rig without
investing a lot of time and effort into a more complex geared or even
remote follow focus.

See thingiverse.com/thing:7256 for a much cooler but also more complex design requiring electronics and microcontroller-programming.

Update:

I added a (not yet tested) straight version of this follow focus because
with my new matte box there was not enough space to mount this anymore.

Video:

blog post:

marcuswolschon.blogspot.com/2011/04/printing-gearless-follow-focus.html

photo album:

picasaweb.google.com/Marcus.Wolschon/20110325Bis201105ShulterRigBauen?feat=directlink

forum post:

forums.reprap.org/read.php?88,75536

project in my personal wiki:

sourceforge.net/userapps/mediawiki/marcuswolschon/index.php?title=Projects/Camera/ShoulderRig#status

IF YOU HAVE NO ACCESS TO A 3D-PRINTER AND CAN't FINE SOMEONE ELSE TO
PRINT THESE FOR YOU, YOU CAN HAVE SHAPEWAYS PRINT THESE FOR YOU:

shapeways.com/shops/marcuswolschon?section=Camera+and+Filming