Problem
A monitor or laptop screen recorded on camera shows scan lines because its refresh behavior conflicts with the camera's shutter timing.
Solution
Root Cause / Diagnostic:
Computer displays and laptop screens refresh at fixed asynchronous frequencies (60Hz, 75Hz, 144Hz) that do not sync with camera shutter timing. The scan lines of the monitor raster across the screen during the camera sensor's rolling exposure.
Actionable Fix:
1. Set the computer display refresh rate to exactly 60.000 Hz (or 120.000 Hz) and set the camera shutter speed to 1/60.0s (or 180 degrees at 30 fps).
2. Use camera synchro-scan / clear scan to dial in the exact decimal shutter frequency until display scan bars disappear completely.
3. Check the recorded monitor screen on your camera viewfinder at 100% magnification to verify crisp, static graphics.
Pro Tip:
Match monitor refresh rate to camera frame rate: set computer displays to 60 Hz when shooting 30/60 fps, or 50 Hz when shooting 25/50 fps.
Computer displays and laptop screens refresh at fixed asynchronous frequencies (60Hz, 75Hz, 144Hz) that do not sync with camera shutter timing. The scan lines of the monitor raster across the screen during the camera sensor's rolling exposure.
Actionable Fix:
1. Set the computer display refresh rate to exactly 60.000 Hz (or 120.000 Hz) and set the camera shutter speed to 1/60.0s (or 180 degrees at 30 fps).
2. Use camera synchro-scan / clear scan to dial in the exact decimal shutter frequency until display scan bars disappear completely.
3. Check the recorded monitor screen on your camera viewfinder at 100% magnification to verify crisp, static graphics.
Pro Tip:
Match monitor refresh rate to camera frame rate: set computer displays to 60 Hz when shooting 30/60 fps, or 50 Hz when shooting 25/50 fps.