Hi everyone- we have been receiving a large number of questions on this new follow focus system so here is the “official” thread.
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. This is accomplished by changing the handwheels which affects the final transmission output.
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).
There are two versions of the O-Focus DM, the Photo Set and the Cine Set; these utilize two different handwheels to optimize the transmission output depending on the type of lens used.
O-Focus DM Photo Set with Hard Stop Handwheel:
O-Focus DM Cine Set with offset Studio Handwheel:
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 Main Bridge, it yields a follow focus industry first; a 1:0.75 transmission ratio. This translates to longer, more exacting focus pulls when using short throw still lenses for digital cinematography. 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. 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.
The Cine Set utilizes the existing CFF-1 Studio Handwheel and has a transmission ratio of 1:1.8 (input:output). When coupled with the O-Focus Bridge it yields a 1:1.4 output transmission ratio well suited for cine lenses with expanded focus scales. The Studio Handwheel is offset, meaning it has 360 degree rotation for optimum placement and view of lens witness marks, and allows the camera to be set on the ground without the rig weight resting on the handwheel.
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 and no need to carry around two follow focus units.
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 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. The 15mm LWS Bridge is compatible with 3rd party 19/15mm Studio Rod Adapters.
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