What the thread found

• Preston FI+Z is a complete lens control system handling focus, iris, and zoom through three servo channels, while Bartech BFD is a simpler single-channel focus device.
• Preston uses 2.4 GHz microwave transmission with 29 frequencies and 16-bit resolution, compared to Bartech's 900 MHz radiowave with 10 frequencies and 12-bit resolution.
• Preston features auto-calibration via digital servo, whereas Bartech requires manual calibration with two dials and uses analog servo.
• Bartech BFD units have shown durability in field use with over 600 units operating in more than 30 countries over multiple years, with most repairs affecting older units lacking design improvements.
• Design refinements to Bartech including reinforced antenna connectors and protective covers for power inputs have reduced failure rates in newer production units.
• Preston wireless systems can malfunction during rental use, including battery failures and cable malfunctions affecting iris control.
• Industry expectation in the United States favors Preston systems despite comparable functional capability from lower-cost alternatives.
• Higher resolution and bit depth in Preston systems provide measurable advantages when shooting anamorphic formats at night or requiring precise repeatable moves.
• Older single-channel focus devices like the Seitz system with lower resolution performed adequately on professional productions.
• Bartech integration into camera rigs allows faster setup per shot compared to lens control systems used infrequently.
• Preston rental rates in England are approximately double those of Bartech single-channel systems despite comparable performance in basic focus pulling.

Depends on

• Discussion based on equipment status in 2005.
• Comparison involves both owned and rented Preston systems, with maintenance quality varying by rental company.
• Microwave frequency advantages depend on local RF environment conditions.
• Claimed precision differences between 12-bit and 16-bit resolution are theoretical and may not be perceptually distinguishable in all shooting conditions.
• Industry preference for Preston appears regional, noted specifically in the United States.
• Some participants' experience limited to specific production contexts or system configurations.

Gear in this thread

FI+Z, MDR, BFD

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