MrFocus

This is a simple 3D printed mount and sketch to turn a traditional follow focus into an input device.  The original purpose was, well, pulling focus (in a CG shot), but the combination of high resolution, stable output, and marking disc make it useful for other applications.

Parts List

Follow Focus: http://www.amazon.com/gp/product/B005ERZVX0/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1 (Cheap, as FFs go, and nice because you can dial in some resistance.)

Set screws (Optional. The hard stops annoyed me so I replaced them with M3 set screws.): http://www.amazon.com/gp/product/B000BMA1ZQ/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

3D printed mount: http://www.adamhabib.com/downloads/ffmount4.stl or http://www.adamhabib.com/downloads/ffmount4.f3d (Inventor Fusion file)

Teensy 2.0++: http://www.pjrc.com/store/teensypp.html (You could surely use a simpler–and cheaper–board.  I just happened to have one around.)

Pinion (32T 32P.  A true 0.8 gear would be better but this worked): http://www.servocity.com/html/32_pitch__6mm_bore__gearmotor_.html

Rotary Encoder: https://www.sparkfun.com/products/11102

Breadboard: http://www.adafruit.com/products/571 (again, what I had lying around)

Screws: http://www.amazon.com/gp/product/B000FN3U8G/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

 

Arduino Sketch

MrFocus_0_2

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