Luma Calc

LumaCalc is an exposure calculator for photographers and videographers.

Change your aperture, ISO, ND filter, or EV compensation — LumaCalc instantly tells you the exact shutter speed needed to maintain a correct exposure. No more mental math on set.

◆ Perfect for
- Photographers who attach ND filters and need to recalculate shutter speed every time
- Long exposure shooters who want to know the exact duration before pressing the shutter
- Anyone who adjusts aperture or ISO and needs a quick exposure correction on the fly
- Studio, outdoor, and video shooters who need fast, reliable settings

◆ Features

[Exposure Triangle Calculator]
Enter your current camera settings (aperture · ISO · shutter speed), then set your new values. The correct shutter speed is calculated in real time — no confirm button needed, results update instantly as you scroll.

[ND Filter Calculator]
Supports 23 ND filter densities from ND0 (no filter) to ND512K (512,000× light reduction). Instantly see the required shutter speed for any filter you attach.

[EV Compensation]
Apply exposure compensation from -3.0 to +3.0 EV in 1/3-stop increments to fine-tune your results.

[Long Exposure Display]
Results beyond 30 seconds are automatically formatted so you always know exactly how long to hold the shutter open.
- 1/8000s – 30s : Standard shutter value (e.g. 1/250)
- 30s – 60s : Seconds (e.g. 45s)
- 1 min – 1 hour : MM:SS format (e.g. 02:30)
- Over 1 hour : HH:MM:SS format (e.g. 01:30:00)

[Wide Setting Range]
- Aperture: f/1.0 – f/32 (1/3-stop steps, 31 values)
- ISO: 50 – 80,000 (1/3-stop steps, 33 values)
- Shutter speed: 1/8000s – 30s (56 values)

◆ Designed for the Field
- Dark theme: easy on the eyes in low-light shooting environments
- Wheel picker: drum-roll style selector for fast, precise input
- Haptic feedback: feel every click as you scroll through values
- Out-of-range alerts: clear Too Fast / Too Slow warnings when results exceed camera limits

Stop doing exposure math in your head. Set up your shot faster and more accurately with LumaCalc.