What the thread found

• A BL 2 camera weighing 21 pounds plus a 400-foot coaxial magazine at 7 pounds can be mounted on a mark-five lite sled with 3a arm equipped with gold springs.
• The BL 2 uses 12-volt power with a standard 4-pin XLR connector, though power distribution among the pins may vary between individual units or configurations.
• Coaxial magazines require the 400-foot version and introduce significant weight shift toward the smart side during extended takes, requiring active horizon compensation.
• The camera has only one bottom attachment thread plus a registration pin, making balance precarious and requiring offset mounting to compensate for video recording equipment weight.
• Video assist options are limited and heavy, typically requiring direct viewfinder connections that produce small postage-stamp images unless a zooming monitor is available.
• Low-mode operation with a BL 2 requires a sushi table attachment that compromises handle integrity and has minimal practical utility after testing.
• Early BL 2 models feature 41mm bayonet or BNC lens mounts with optically small lenses that make follow focus motor placement difficult, whereas later models have PL mounts.
• The camera is extremely compact and produces significant balance challenges despite its weight, described as balancing a bowling ball on a stick.

Depends on

• The BL 2 represents 1960s technology with many replacement parts becoming increasingly difficult to source.
• Video assist capabilities vary significantly depending on the specific year and modification history of individual units.
• The exact 4-pin XLR power wiring configuration was not conclusively confirmed in the discussion, with some uncertainty about whether pin 2 carries +12V or ground.
• Lens mount type and optics specifications vary between camera ages, affecting rigging complexity.
• Operational performance limitations were noted but not universally agreed upon regarding practical usage constraints.

Parts

Low Mode, Follow Focus

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