Limitations of a fixed 18 Deg. shutter?
Posted 10 April 2008 - 06:35 PM
Posted 10 April 2008 - 06:54 PM
Your main limitation will be syncing to CRT TV sets on set to get rid of the roll bar, plus off-speed shooting under 60 Hz pulsing AC lights, unless you stick to safe speeds for 180 degrees.
Plus if you plan on taking your camera into a 50 Hz country.
Posted 10 April 2008 - 07:04 PM
In general terms, what are the limitations of using a camera with a fixed 180 deg stutter,
Any issue that involves synching the camera's frame rate to some other real-world flicker -- HMI lights, fluorescent lights, TV screens, and so forth. Since your shutter is fixed, the only way to synch to something with an interval that doesn't neatly match 1/48th second at 24 Hz. is to change the frame rate -- which means losing synch sound.
Shooting 50Hz. lighting at 24fps requires a 172.8 shutter to avoid flicker. Shooting 25fps under 60Hz. lighting requires a 150 degree shutter.
Shooting a 60 (59.94) Hz. CRT TV requires a 144 degree shutter.
Shooting non-HMI-safe frame rates with HMI's requires changing the shutter angle.
Fast shutter effects require... a faster shutter.
Speed ramping without an iris pull requires a change in shutter angle (but that's with a more sophisticated camera anyway).
None of these things are really that big a deal most of the time, and the "work around" depends on the situation. You might rent a different camera body; change the flicker of the item in question, avoid it altogether, live with the effect, etc...