ND FILTER PLANNER
NDCalc 1.0
The CamWise ND Filter Calculator helps you figure out how many stops of neutral-density filtration you need when changing exposure settings. Whether you’re opening the aperture for shallower depth of field, lowering ISO for cleaner highlights, or switching to a higher frame rate, this tool keeps your exposure consistent by showing how much light reduction to apply.
Tip: Use it before a shoot to plan which ND strengths to pack, or on set to quickly balance exposure when changing fps, shutter speed, or aperture. It’s especially handy for maintaining natural motion blur when adjusting frame rate.
ND Filtration Stop Calculator
Current settings
Target settings
Results
Frequently Asked Questions
Frame rate and shutter speed are linked through shutter angle. When you increase your frame rate (for example, from 24 fps to 60 fps) but keep the same shutter angle, your exposure time per frame gets shorter. That means less light reaches the sensor, which darkens the image. This calculator accounts for that automatically, showing how many ND stops you’d need to maintain the same brightness when changing fps.
Not exactly. The ND Filter Calculator is meant for planning and quick on-set reference, not precise luminance measurement. It assumes you’re already properly exposed and want to know how changing aperture, ISO, shutter, or frame rate will affect exposure balance. A light meter or waveform monitor is still essential for verifying actual scene brightness and ratios.
Start by entering your current exposure settings, then adjust the target values you’d like to change—such as opening the aperture or switching to a higher frame rate. The tool will tell you how many ND stops you need to maintain the same exposure. It’s most useful for choosing the right filter before rolling, planning lens swaps, or confirming that your ND kit covers the range you’ll need for a scene.