2015General Discussion forum
Back focus shifts during camera transport on rolling Steadicam stands
What the thread found
- Back focus can shift on cameras during transport if the stand's wheels vibrate excessively due to misalignment of wheel casters or poor wheel condition.
- Multiple operators reported no back focus issues when transporting the Sony F55 on properly functioning rolling stands over extended periods.
- Removing the lens before rolling the stand eliminates any potential vibration-related focus drift.
- Wheel caster misalignment causes rapid vibrations that can transfer through the stand structure and affect mounted equipment.
- Pneumatic wheels may still vibrate if their casings are not seated properly, even though air in the tires should reduce vibrations.
- Previous back focus problems attributed to rolling stand transport may have actually stemmed from wheel or stand mechanical issues rather than the transport method itself.
Depends on
- Reports are from film production sets with varying floor conditions.
- The specific cause of the back focus issues from the previous season was never definitively confirmed.
- No measurements or technical data were provided to quantify vibration levels.
- Most successful experiences involved smooth, flat studio floors.
- The discussion does not clarify whether back focus drift was permanent or temporary after transport.