What the thread found

• The combination of F900 camera, Pro 35 adapter, and associated equipment can approach or exceed typical arm weight limits, requiring careful component selection and configuration planning.
• Powering the camera from the sled battery rather than onboard battery can reduce top-heavy weight distribution and improve handling.
• The Pro 35 adapter offers two rod support points, with the forward support point reducing lens flex and focus motor binding compared to the rear mounting position.
• Removing or minimizing components like the viewfinder, wireless transmitter, and separate HD monitor can help reduce overall package weight when necessary.
• Placing the dovetail plate as far forward as possible on the quick release plate helps counterbalance front-heavy configurations.
• The Pro 35 adapter uses a 3-pin Fisher connector for remote focus control, matching Arri's standard remote run interface.
• Velcroing audio receivers to the back of the camera can shift weight distribution toward the rear when onboard batteries are unavailable.
• Using onboard V-lock Sony batteries instead of sled-powered configurations can work for managing front-heavy weight issues.
• Lens selection affects total package weight and balance; Zeiss Super Speeds are lighter than Cooke S4 lenses.
• Regional differences in available lens inventory and lighting conditions may influence typical lens pairing choices with the adapter.

Depends on

• The G-50 arm has a 50-pound weight limit that can be challenging with this full setup depending on lens selection.
• The remote focus 3-pin Fisher connection showed inconsistent operation with some camera units in field use.
• Front-heaviness is inherent to this adapter configuration and cannot be fully eliminated.
• Low-mode operation adds additional weight and complexity to the setup.
• Weight estimates provided are approximations and actual weights vary by specific equipment configuration.
• The advice about operating beyond arm capacity in emergencies was cautionary and not recommended as standard practice.

Gear in this thread

G-70catalog, HU3, BFD

Parts

Dovetail Plate

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