Frequency
Mains-powered LEDs pulse 100 or 120 times a second. Your eye averages it. Your sensor does not.
Scan · Measure · Match · Shoot
KNOW BEFORE
YOU SHOOT.
Scan your set. Measure your light. Find problems before you roll.
Scene scan · scroll to scan
KEY LIGHT
5600K · 850 lux
FILL
5400K · 265 lux
PRACTICAL
3200K · 95 lux
CEILING LED
120 Hz · flicker
Why
YOUR SET IS TALKING.
ONSET LISTENS.
Every light on set has a frequency, a brightness, a colour and a flicker behaviour. OnSet Assist reads all four and tells you what they mean for your camera.
Brightness
Lux on the face, the background, the hair light. Ratios decide the look.
3200K5600K
Colour
Kelvin and green–magenta tint. Mixed sources read as two colours on camera.
Flicker
The wrong shutter turns that pulse into rolling bands across the frame.
01 · Scene Scan
SCAN THE SET.
Raise your phone and move it slowly across the set. OnSet Assist tags every light source: its level, its colour, and whether it will flicker on your camera.
SIMULATED DEMO · NOT A LIVE MEASUREMENT
Move over the set and hold on each light source. On a phone, tap them.
02 · Flicker
FLICKER YOU CAN'T SEE.
PROBLEMS YOUR CAMERA CAN.
Banding simulated for illustration
03 · Recommendations
GET THE SETTINGS.
Not a formula. A setting your camera can actually be set to. If a body only has standard shutter speeds, OnSet Assist never tells you to dial 1/53.4.
Shutter angle: not verified · Fine shutter: not verified. Unverified features are treated as unavailable.
Sony A1 II
SAFE25
FPS
1/60
Shutter
150°
Angle
- · Ceiling LED flickers at 120 Hz.
- · 1/60 spans exactly 2 flicker cycles, so every sensor row sees the same light.
- · This is the closest flicker-safe setting to 180°.
- · Dial it in as a shutter speed, the way this camera works.
04 · Meters
MEASURE EVERYTHING THAT MATTERS.
Light meter, colour meter, spot meter and lighting ratios, calibrated against your own reference meter if you have one, and always labelled as estimates.
Key
850 lux
Fill
265 lux
1.7 STOPS · 3.2 : 1
Practical
3200K
Key
5600K
Recommended white balance
5600K · M+2
Let the practical stay warm.
Spot meter
Face 0.0 · Window +2.7
Tap areas of the image and compare them in stops.
Exposure
F2.8 −0.2 · ND 0.9
Holds your chosen stop at ISO 800, 1/50, and finds the ND.
Calibration
Saved per phone
Match the phone to a professional meter once; the offset stays.
05 · Continuity
MATCH IT LATER.
Come back to a location three weeks later. OnSet Assist compares the room with the setup you saved, light by light, and tells you how far to move each one.
DAY 1 → DAY 21
KEY
ADJUSTTarget
850 lux · 5600KNow
720 lux · 5150KΔ
+0.24→ Raise about 0.25 stop, cool by ~450 K
FILL
MATCHEDTarget
265 lux · 5400KNow
262 lux · 5400KΔ
+0.02BACKGROUND
ADJUSTTarget
70 lux · 6500KNow
98 lux · 6500KΔ
−0.49→ Lower about 0.5 stop
06 · My Kit
BUILT AROUND YOUR KIT.
Add your cameras, lenses, filters and lights. Recommendations respect what each body can really do: its frame rates, shutter modes and flicker tools. Specifications are only stored when verified; anything else is marked as such.
Camera · in use
Sony A1 II
23.976 / 24 / 25 / 29.97 / 50 / 59.94 / 100 / 119.88 fps
Shutter angle · not verified → recommendations use standard speeds
Lens
Sony FE 50–150mm F2 GM
50–150mm · F2 · Sony E
07 · Set Reports
YOUR SHOOT. DOCUMENTED.
Every scan resolves into a set report: camera, lens, settings, every light reading and the flicker status. Export it as a PDF for the production, or keep it for the reshoot.
ONSET ASSIST
Set report
Project
Content Trips
Scene
Interview 01
- BODY
- Sony A1 II
- LENS
- FE 50–150mm F2 GM
- FOCAL
- 85mm
- FPS
- 25
- SHUTTER
- 1/50
- ANGLE
- 180°
- ISO
- 800
- APERTURE
- F2.8
KEY
5600K · 850 lux
FILL
5400K · 265 lux
PRACTICAL
3200K · 95 lux · 100 Hz
Key / Fill
1.7 stops · 3.2 : 1
READY TO SHOOT
08 · Try the app
OPEN APP. POINT PHONE.
This is the OnSet Assist app itself, running in your browser. Start a Scene Scan, run a flicker test, open the set report or match a setup from three weeks ago.
SIMULATED DEMO · NOT A LIVE MEASUREMENT
- · Scene Scan: drag across the set, or tap “Demo: scan for me”.
- · Flicker Scan: try 100 Hz, 120 Hz, fast PWM or a steady source.
- · Tools: light, colour and spot meters, scopes and calculators.
- · Projects: a saved interview setup, its report and Match Setup.
In a browser nothing is measured. On a phone, OnSet Assist analyses the camera feed locally; nothing is uploaded unless you save it.
Everything in one app
THE TOOLKIT IN YOUR POCKET.
01
Scene Scan
Every light, one verdict
02
Flicker Scan
Frequency and safe shutters
03
Light Meter
Lux, EV, aperture, ND
04
Color Meter
Kelvin and tint
05
Spot Meter
Compare areas in stops
06
Lighting Ratios
Key, fill, back, hair
07
False Color
Exposure zones
08
Waveform
Luma by position
09
Histogram
Tonal distribution
10
My Kit
Cameras, lenses, filters
11
Match Setup
Continuity across days
12
Set Reports
PDF for the production
13
Calculators
DoF, FoV, ND, sun, frame guides
14
Ask Assist
“Can I shoot this at 50 FPS?”
Pricing
7 DAYS FREE.
Everything included. Cancel any time during the trial and you pay nothing; you get a reminder a day before it ends.
- ✓Scene Scan & flicker map
- ✓Light, colour & spot meters
- ✓Scopes & calculators
- ✓Match Setup continuity
- ✓Set Reports & PDF export
- ✓Unlimited projects
Prices in euro including VAT. Subscriptions are handled by the App Store and Google Play. Launching soon on iPhone and Android.