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.