What the thread found

• The DVX-100 has an infinite focus wheel that transmits focus digitally to the camera, which can cause recalibration problems during shooting when power states or camera modes change.
• Focus calibration can shift unexpectedly when changing batteries, switching to VCR playback mode, adjusting zoom, or modifying camera settings, requiring rechecking focus marks before each take.
• Syncing the physical focus ring position with the motor transmitter by setting both to infinity and re-engaging can resolve misalignment between lens and transmitter.
• The DVX-100 lens does not maintain consistent focus across the zoom range without manual compensation, a limitation of consumer-grade lens design that autofocus normally handles.
• The infinite nature of the focus ring makes it easy to exceed the actual lens focus travel range, potentially causing the electronic scale to expand beyond intended limits.
• Disabling the camera's automatic standby shutdown and always returning the lens to infinity before powering down or mode switching can improve calibration stability.
• Third-party focus ring attachments are available with different quality levels, including plastic geared versions and precision metal geared options with mechanical travel limiters.

Depends on

• The original poster used a dented focus wheel, which may have contributed to calibration problems.
• Not all experiences may apply equally to both DVX-100 and DVX-100A models, as some participants reported different behavior between versions.
• Whether focus position memory is lost during battery changes versus full power-down is unclear and may vary by camera unit.
• The Century Precision focus ring's mechanical travel limiter may restrict actual lens focus travel if not properly adjusted for each lens.
• One participant's positive experience with a Chroziel external focus system may not be directly comparable to motorized follow focus setups.
• The exact cause of the original poster's recurring calibration shifts was never conclusively determined.

Parts

Follow Focus

Same gear or parts

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