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ND Filter Calculator
x402
ND Filter Calculator is a paid API for AI agents from photo-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Converts between ND factor, stops, and optical density, then computes the new shutter speed when an ND filter is applied.
Price / call$0.02
Success—
StatusUnknown
How this service works
ND filter maths: convert between ND factor, stops and optical density, and get the new shutter time with the filter on.
Output
Returns the computed new shutter speed (as a human-readable string and raw seconds), the ND factor, number of stops, optical density, original shutter in seconds, and a handy comparison table showing what shutter speed you'd get with common ND filters (ND2, ND4, ND8, ND64, ND1000, ND64000) at your metered speed.
Example use cases
Long exposure waterfall shot
“I want to shoot a waterfall with a silky blur effect. My metered shutter without any filter is 1/125 and I'm using an ND1000 filter — what shutter speed should I dial in?”
Converting ND stops to factor
“I keep hearing about 10-stop ND filters but my filter is labeled ND1024 — can you tell me how many stops that is and what the optical density is?”
Choosing filter for target shutter speed
“I want to shoot at 1/8000 metered speed but actually need a 2-second exposure for a creative blur. What ND factor and how many stops of filtration do I need? My base shutter is 1/8000.”
Technical details
Endpoint
GEThttps://photo-calc.x402tookit.com/nd-filter?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise ND filter exposure math — converting between ND factor, stops, and optical density, or computing the correct shutter speed after adding a neutral density filter. It is the right choice for photography workflow agents, camera assistant apps, or long-exposure planning tools. Prefer it over generic calculators when you specifically need the photography-domain output format including human-readable shutter strings and a common-filter comparison table.
Side effects
- Missing shutter parameter returns an error since it is required
- Providing more than one of stops/factor/density may cause ambiguity or an error
- Invalid shutter format (e.g. not a fraction or decimal) may fail to parse
- Providing zero or negative values for stops, factor, or density is likely invalid
- Network or payment failure returns a 402 or connection error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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