Luma Calc

Changed your ND filter or aperture? LumaCalc instantly calculates the correct shutter speed to keep your exposure perfectly balanced.

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.