CAMERA SYNC TEST

WHAT THIS TOOL IS FOR

A camera sync test helps expose screen/video mismatch.

It makes rolling shutter bands, PWM flicker and moiré easier to film.

Use it when recording monitors, phones, TVs or projector output.

WHO USES IT?

Video makers, display testers, developers and repair technicians.

Useful when diagnosing banding, flicker or strange camera stripes.

COMMON SEARCHES

camera sync test • rolling shutter test • camera banding test

PWM flicker test • film monitor without bands • screen recording sync

HOW TO USE

1) Pick a pattern and preset on Page 1.

2) Press START and film the fullscreen pattern.

3) Try 60fps and 120fps camera modes if available.

4) Exit with ESC or tap/click.

WHAT TO LOOK FOR

Moving dark bars: rolling shutter / refresh mismatch.

Pulsing brightness: PWM dimming or strobe backlight.

Wavy grid: moiré and sampling limits.

Split drift: top/bottom scan timing differences.

BEST SETTINGS

Disable auto-brightness and low-power modes where possible.

Use manual shutter speeds like 1/60 or 1/120 if your camera allows.

Dim room lighting can make screen banding easier to see.

FAQ

Why do bands move? Camera scan and display refresh are not aligned.

Why worse when dim? Some screens use PWM at lower brightness.

Is this a true Hz meter? No — it is a visual recording test.

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

MINI BLOG

Rolling shutter scans video frames line by line.

Displays refresh in their own rhythm.

Mismatch creates dark bars or flicker in recordings.

Presets make repeatable comparisons easier.

DEVICE GUIDANCE

Phones may throttle refresh in battery-saver mode.

OLED/PWM behaviour can change with brightness.

Try both native camera app and pro camera apps.

RELATED TOOLS

P790 Advanced Display Tools • P794 Screen Flash Timer

P793 Refresh Rate Test • P796 High Contrast

Previous: P794 Flash Timer • Next: P796 Accessibility

BEST PATH

Use P793 Refresh Rate before this page to understand cadence limits.

Use P794 Flash Timer for a pure black/white frequency source.

Use P796 High Contrast for accessibility-safe display checks.

NAVIGATION

Footer links connect HOME, INDEX, PREVIOUS and NEXT.

The internal pager uses the same button names on every page.

PRIMARY PHRASE

camera sync test is the main search phrase for Teletext-Tools page 795.

The page helps users film screens and reveal sync mismatch.

CODE HIGHLIGHT

<title> names rolling shutter, flicker and banding.

canonical points to /camera-sync-test/.

SEARCH INTENT

Users want a full-screen pattern they can record with a phone or camera.

Page 1 answers that intent with live presets, preview and fullscreen output.

RELATED SEARCHES

rolling shutter test, camera banding test and PWM flicker test support this page.

Film monitor without bands and screen recording sync match practical user intent.

CODE HIGHLIGHT

patternSel switches between scrolling bars, strobe, split scan and grid.

rateRange controls the test frequency.

READABILITY

SEO copy is not squeezed beside the working camera sync controls.

Large internal panels keep help text readable on desktop, tablet and mobile.

PATTERN FEATURES

Scrolling bars reveal rolling shutter and refresh mismatch.

Strobe/PWM helps show flicker and brightness pulsing.

Fine grid makes moiré and sampling effects visible.

CODE HIGHLIGHT

drawBars() renders moving light/dark bands.

drawStrobe() renders timed black/white switching.

drawGrid() renders fine-line sampling checks.

USER BENEFIT

Multiple patterns let one page cover cameras, screens and lighting behaviour.

Presets give fast repeatable starting points.

FULLSCREEN VALUE

Fullscreen removes page furniture around the sync pattern.

The optional HUD shows selected pattern, rate, brightness and FPS.

CODE HIGHLIGHT

fx is the fullscreen layer for filming.

fxCatch catches tap and click exits above the canvas.

hudChk controls the recording overlay.

INTERNAL LINKING

Screen Flash Timer and Refresh Rate Test support related work.

Footer PREVIOUS goes to P794 and NEXT goes to P796.

SEO SUMMARY

Best folder: /camera-sync-test/

Canonical URL matches the recommended folder exactly.

Tool stays on Page 1; guidance and search help are split across later pages.

KEYWORDS

camera sync test • rolling shutter test • camera banding test

PWM flicker test • display refresh mismatch • screen sync pattern

film monitor test • moiré grid test • strobe screen test

CODE HIGHLIGHT

meta description names fullscreen, preview, presets and safety notes.

robots allows indexing with large preview settings.