Photometry & ImagingApostilbs to Stilbs

Apostilbs to Stilbs

Methodology·How We Verify

Snapshot

1 Apostilbs equals 0.000032 Stilbs.

Reference basis: This conversion uses fixed luminance constants anchored to candela per square meter.
Example: For 5 Apostilbs, the result equals 0.000159 Stilbs.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

0.000032 Stilbs (sb)

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API and AI agent access

Apostilbs to Stilbs.

Machine-readable identifiers

Conversion family: photometry-imaging
Source unit: apostilbs
Target unit: stilbs

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "photometry-imaging",
  "value": 1,
  "from": "apostilbs",
  "to": "stilbs"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "photometry-imaging",
    "value": 1,
    "from": "apostilbs",
    "to": "stilbs",
    "result": {
      "raw": 0.0000318309886184,
      "display": "0.000032"
    },
    "canonicalPath": "/photometry-imaging/apostilbs-to-stilbs/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts apostilbs into stilbs by normalizing both luminance units through candela per square meter. Formula: sb = asb × 0.0000318309886184. That keeps the snapshot, calculator, common values, and mirror page aligned on one luminance basis.

This is useful for display brightness checks, projection calibration, and imaging workflows where legacy photometric units and modern cd/m²-based measurements need to match cleanly.

Method & Luminance Basis

Method basis: both units reduce through candela per square meter, then apply the fixed target-unit luminance relationship.
Applied factor: 1 Apostilbs = 0.000032 Stilbs.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Apostilbs (asb)	Stilbs (sb)
1	0.000032
5	0.000159
10	0.000318
25	0.000796
50	0.001592
100	0.003183
250	0.007958
500	0.015915
1000	0.031831

Questions & answers

Frequently Asked Questions

Why is Apostilbs to Stilbs useful in display and projection work?

This route is useful when comparing modern display-brightness values with legacy luminance units used in cinema, projection, calibration, and older imaging references.

When would I convert apostilbs to stilbs?

This route is useful when comparing modern display-brightness values with legacy luminance units used in projection, cinema, and older photometric references.

How do I reverse Apostilbs to Stilbs?

Use the mirror Stilbs to Apostilbs route; it applies the inverse relationship with the same cd/m²-based luminance assumptions.