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  3D printed follow focus gears, to buy (in ABS) or print through shapeways.com
SA-P-50-104-8-00 on PL mounted Cooke Speed panchro 50mm

follow focus gear for movie lenses in Arri Standard Mount:
These rings for Arri standard lenses are designed to sit forward of the focus grip to allow for more room between the gears and the camera, especially when used with PL adapters where the lens sits slightly into the lens port.

Part no.

SA-P-50-118-8-00

96mm dia gear for Panchro 35mm, 50mm
follow focus gear for 50mm Taylor Hobson Speed Panchro lens SA-P-50-104-8-00 85mm dia gear Speed Panchro 35, 50, Kinetal 12.5mm
follow focus gear for 75mm Taylor Hobson Speed Panchro lens SA-P-75-118-8-00

96mm dia gear for Panchro 75mm

follow focus gear for 75mm Taylor Hobson Speed Panchro lens SA-K-100-118-8-00

96mm dia gear for Kinetal 100mm

follow focus gear for 75mm Taylor Hobson Speed Panchro lens SA-S-10-118-8-00

96mm dia gear for Schneider Cine Zenon 2/28mm, 1.4/25mm, 2/16mm
96mm dia gear for Schneider Cinegon 1.8/10mm

follow focus gear for 75mm Taylor Hobson Speed Panchro lens SA-CJZ-10-118-8-00

96mm dia gear for Zeiss Jena lenses eg 2/3.5cm Biotar
96mm dia gear for Schneider Cinegon 1.8/10mm

  80mm matte-box step ring/spacers for lenses in Arri Standard Mount:

Part no.

43-80-00

Speed Panchro 75mm series 1 (43.11mm). lens filter thread ~40.64mm
455-80-00 Speed Panchro 75mm series 2 (45.6mm). lens filter thread ~42mm
Speed Panchro 35*, 50, Kinetal 100mm, 150mm matte box step rings 51-80-00 Speed Panchro 35*, 50, Deep field 100mm, Kinetal 100mm, 150mm
any lens using a BRIT 370 or Kodak EK6 hood or filter
48-80-00 typically early Zeiss Jena Sonnar in Arri Std mount. (ø48mm)
60-80-00 Baltar 2/100mm. (ø60.3mm)
  80mm matte-box step ring/spacers for stills lenses:
note some lenses will require a filter ring to be fitted to the lens to hold the spacer.
51-80-00 for Standard 49mm lens/filter fronts, eg Pentax SMC (50.9mm)
54-80-00 for Standard 52mm lens/filter fronts, eg Nikon AI lenses (ø53.9mm)
57-80-00 for Standard 55mm lens/filter fronts, eg Konica AR & Minolta MD lenses (ø56.9mm)
  Notes:

The 85mm diameter gears are a similar size to those found on Arri Mk1 super speeds.
The 96mm diameter gears were designed to allow some follow focus wheels to access the ring when used on the Blackmagic Cinema camera (where the 85mm rings were not quite reached when the external power plug is fitted).
Typically the 85mm gears transform the 1/4 turn of the Standard Arri helicoid to a 3/4 turn on a follow focus wheel. The 96mm diameter gear increases this slightly to just over a 3/4 turn.
 

Notes on early Cooke Panchros etc

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last updated: 12 July 2015