Teletext-Tools 795 — Camera Sync Test

LAB-GRADE CAMERA SYNC

P795

Fullscreen is pure pattern + bottom-left stats. Exit: ESC or tap/click.

Use it to reveal rolling shutter, PWM flicker, and banding in recordings.

PATTERN

RATE

30.0

UNITS

(Hz = cycles/sec)

BRIGHT

100%

OPTIONS

INVERT SHOW HUD SNAP PRESETS

PRESET

STATUS

READY → PRESS START

PREVIEW

FULLSCREEN HAS NO UI

Tip: record at 60/120fps. If you see moving bands, you’re seeing sync mismatch or rolling shutter.

1) Choose a PATTERN (Page 1)

2) Set RATE (Hz) or use a preset

3) Press START → fullscreen

4) Film it with another camera

5) Exit: ESC or tap/click

Moving dark bars: rolling shutter / refresh mismatch

Pulsing brightness: PWM dimming / strobe backlight

Wavy grid: moiré + camera sampling limits

Split drift: top/bottom timing differences

Camera: 60 or 120fps video

Shutter: if manual, try 1/60 or 1/120

Screen: disable auto-brightness if possible

Room: dim lighting improves visibility

Why do bars move? camera scan + display refresh aren’t aligned.

Why does it change at low brightness? many displays use PWM.

Does this measure true Hz? it’s a visual test, not a meter.

How do I exit? ESC or tap/click screen.

Modern cameras scan frames line-by-line (rolling shutter). Displays refresh in their own rhythm.

When those rhythms clash, you get bands. This tool makes them obvious and repeatable.

rolling shutter test • flicker test • pwm dimming test

camera banding test • display refresh mismatch

screen sync pattern • film a monitor test