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Product Specification

O-Focus Dual Mini
Designed to meet the exacting needs of professional camera operators and assistants, the OConnor O-Focus Dual Mini is a compact, double-sided direct drive follow focus unit optimized for both still and cine-style camera lenses.

The precision gear drive of the main bridge is designed with a gear ratio of 1:0.75 so that 360 degrees of input (rotation of the handwheel) results in 270 degrees of output (rotation of the drive gear). Two versions of the O-Focus DM, the Photo Set and the Cine Set, utilize different handwheels to apply a unique transmission output in order to optimize rotation for the relevant lens type.

O-Focus DM Photo Set
The Photo Set utilizes a new Hard Stop Handwheel, which has a transmission ratio of 1:1 (input:output). When coupled with the O-Focus Bridge, it yields a follow focus industry first; a 1:0.75 transmission ratio. This translates to longer, more exacting focus pulls when using limited barrel rotation still lenses for digital cinematography, and allows more precise lens control than has previously been available for these camera configurations. A small ratio change can make a big ‘feel’ difference!

The hard stops enable the operator to set minimum and maximum focus points for lenses with unlimited rotation and to carry out hard focus stop pulls. To allow the focus-puller to react to unexpected movements, the unique single-hand-operated hard stop on/off switch, allows for instantaneous disengagement of the end stops for critical adjustments even during the shot.

Main Features
The modular design of the O-Focus DM enables operators who want to transition between Photo and Cine lenses to optimize the transmission ratio to suit simply by swapping out the handwheel(s) – no tools required.

Both versions of the O-Focus DM feature extremely low profiles, which allow use with large diameter lenses. The sliding dovetail design provides adjustment for various lens sizes, even those with very large lens barrel diameters. Additionally, tapered flank couplings (pioneered with the OConnor CFF-1) eliminate play between the handwheel and bridge connection.

The O-Focus DM integrates seamlessly with existing follow focus accessories including whips, cranks and gears. It also shares many of the OConnor CFF-1 accessories, such as the Studio Handwheel and Marking Discs, Handwheel Extension and Studio 15/19mm Bridge. The new Toothless Friction Driver, for the use of still lenses, eliminates much of the need for additional toothed gear rings

  • Extremely low profile double sided bridge design
  • Direct drive gear box with no swing arm
  • Adjustable via sliding dovetail to various lens diameters
  • Compatible with large lens barrel diameters
  • Photo set yields industry first 1:0.75 gear ratio for photo lenses
  • Modular design enables gear ratio to be optimized through swap out handwheels

How it Compares with the CFF-1:
The O-Focus DM Photo Set shares a number of features with the CFF-1, but is a smaller unit optimized for still photo lenses. The gear ratio is 1:0.75, versus 1:1.84 for the CFF-1.

Shared Features with the CFF-1:

  • Extremely low profile double sided bridge design
  • Low profile bridge
  • Interchangeable studio / LWS bridge
  • Interchangeable knobs, knob extensions and gears
  • Interchangeable marking discs
  • Offset handwheel
  • Standard whip / crank coupling

Differentiating Features from the CFF-1:

  • Gear ratio / Lens optimization
  • Direct drive vs. swing arm
  • Physical size

Modular Follow Focus system optimized for photo lenses

Weight of unit (incl. LWS rod bridge, handwheel) 1.23 lbs (0.56 kg)
Weight of bridges (excl. handwheel) 0.73 lbs (0.33 kg)
Dimensions (excl. handwheel) 7.2 x 2.2 x 1.5 in. (182 x 57 x 37mm)
Dimensions of hard-stop handwheel Ø3.2 x 3.7 in. (Ø82 x 94 mm)
Max. lens diameter (with LW rods) Ø116 mm
Gear ratio 19:25 (0:.75)
Positioning of driver gear Main bridge interlock (back / front)
Module coupling system Backlash-free
Drive gear coupling Standard serrated star
Rod system compatibility 15 mm LWS, studio 15 mm/19 mm

O-Focus DM Photo PRO Kit C1242-0001
PRO Kit includes:
O-Focus DM Main Bridge with:
O-Focus Hard Stop Handwheel C1242-1100
15mm LWS Bridge C1241-1540
Driver Gear 43 tooth 0.8M 6mm face (Cine) C1241-1600
Driver Gear 35 tooth 0.8M 10mm face (Cine) C1241-1700
Driver Gear 50 tooth 0.6M 7.5mm face (Fujinon ENG focus) C1241-1800
Driver Gear 60 tooth 0.5M 7.5mm face (Canon ENG focus) C1241-1900
Gear Friction Driver C1242-1001
Set of 10 Conical Marking Discs C1242-1530
Peli Storm Case with Custom Foam Inserts C1241-1850

Available Options for O-Focus DM Photo
CFF-1 Studio Hand Wheel C1241-1100
O-Focus Hard Stop Handwheel C1242-1100
Set of 10 Flat Studio Marking Discs C1241-1530
Set of 10 Flat Studio Marking Discs (glow in the dark) C1241-1531
Set of 10 Conical Marking Discs C1242-1530
Driver Gear 43 tooth 0.8M 6mm face (Cine) C1241-1600
Driver Gear 35 tooth 0.8M 10mm face (Cine) C1241-1700
Driver Gear 50 tooth 0.6M 7.5mm face (Fujinon ENG focus) C1241-1800
Driver Gear 60 tooth 0.5M 7.5mm face (Canon ENG focus) C1241-1900
Friction driver C1242-2001
Handwheel Extension C1241-1500
15mm LWS Rod Bridge C1241-1540
Speed Crank C1241-1520
Flexible Drive Shaft Assembly C1241-1510
Flexible Drive Shaft C1241-1515
Peli Storm Case with Custom Foam Inserts C1241-1850
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Steve is OConnor’s Product Manager responsible for all products. He has worked in camera support and accessories engineering for over 12 years. He is a qualified Mechanical Engineer and in his previous roles he has worked on, or conducted the introduction of all the current range of OConnor’s principal products. When he isn’t working, Steve spends time with his young family.

Key Features

  • Double sided LWS follow focus

  • Handwheel interchangeable with the CFF-1 Studio handwheel [available to purchase separately] to optimise the follow focus for cine lenses – no tools required!

  • Unique 1:0.75 gear ratio for a longer, more exacting focus pull with photo lenses.

  • Hard stop handwheel with unique, accessible hard stop activator switch that enables one-handed, in-shot activation/deactivation of the hard stops.

Product Video