2011Follow Focus forum
Arri UDM-1 ultrasonic distance measurement device for follow focus applications
15 years old. Gear and prices may have changed since.
What the thread found
- The UDM-1 measures distance using ultrasonic signals reflected from objects and displays results on an LCD screen in feet/inches or metric units.
- The device integrates with Arri's lens control system to enable autofocus capability when connected to their LDS data system.
- The LCD display exhibits poor visibility when viewed at angles, making it difficult to read from certain positions on set.
- LED-based displays with red backlighting would provide superior visibility compared to the LCD implementation used in this model.
Depends on
- Discussion compares the UDM-1 against CineTape but does not provide complete technical specifications for direct comparison.
- The LCD visibility issue is described anecdotally rather than through detailed measurement or testing.
- No information provided about whether the offset feature gap versus competitors affects actual follow focus performance.
Parts
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