ND filter maths: convert between ND factor, stops and optical density, and get t...
https://photo-calc.x402tookit.com/nd-filterOverview
ND filter maths: convert between ND factor, stops and optical density, and get the new shutter time with the filter on.
Protocol
x402
Price
$0.02
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
uncategorized
Provider
Photography Calculators
Source
bazaar
Indexed
2026-10-20 21:22:32
Health
Status
healthy
Latency (p50)
515ms
Uptime (30d)
86.7%
Reliability Score
83.3/100
Last Checked
2026-10-28 06:40:38
Last Healthy
2026-10-28 06:40:38
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Input Schema
{
"method": "GET",
"queryParams": {
"shutter": "1/60",
"stops": 10
},
"type": "http"
}
Output Schema
{
"example": {
"asOf": "2026-10-11T08:40:15.565Z",
"commonFilters": {
"ND1000": "~10",
"ND2": "1 stop",
"ND4": "2",
"ND64": "6",
"ND64000": "~16",
"ND8": "3"
},
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"duration": "17 s",
"ndFactor": 1024,
"newShutter": "17.1 s",
"newShutterS": 17.066667,
"notChecked": [
"reciprocity failure on film (long exposures need extra time)",
"colour casts and IR leakage of strong filters",
"…1 more"
],
"opticalDensity": 3.0103,
"originalShutterS": 0.016666667,
"reasons": [
"Each stop doubles the exposure time: new time = old time x 2^stops. Optical density = stops x 0.301.",
"Within a normal camera shutter range."
],
"source": "computed locally",
"stops": 10,
"summary": "10 stops = ND1024 = density 3.01: 1/60 s becomes 17.1 s.",
"verdict": "LONG_EXPOSURE"
},
"type": "json"
}